x509_vfy.c 72.3 KB
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/* crypto/x509/x509_vfy.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
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 *
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 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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 *
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 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
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 *
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
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 * 4. If you include any Windows specific code (or a derivative thereof) from
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 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
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 *
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 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <time.h>
#include <errno.h>

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#include "internal/cryptlib.h"
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#include <openssl/crypto.h>
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#include <openssl/lhash.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/asn1.h>
#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/objects.h>
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#include "internal/x509_int.h"
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#include "x509_lcl.h"
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/* CRL score values */

/* No unhandled critical extensions */

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#define CRL_SCORE_NOCRITICAL    0x100
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/* certificate is within CRL scope */

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#define CRL_SCORE_SCOPE         0x080
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/* CRL times valid */

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#define CRL_SCORE_TIME          0x040
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/* Issuer name matches certificate */

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#define CRL_SCORE_ISSUER_NAME   0x020
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/* If this score or above CRL is probably valid */

#define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)

/* CRL issuer is certificate issuer */

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#define CRL_SCORE_ISSUER_CERT   0x018
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/* CRL issuer is on certificate path */

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#define CRL_SCORE_SAME_PATH     0x008
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/* CRL issuer matches CRL AKID */

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#define CRL_SCORE_AKID          0x004
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/* Have a delta CRL with valid times */

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#define CRL_SCORE_TIME_DELTA    0x002
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static int null_callback(int ok, X509_STORE_CTX *e);
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static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
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static int check_chain_extensions(X509_STORE_CTX *ctx);
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static int check_name_constraints(X509_STORE_CTX *ctx);
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static int check_id(X509_STORE_CTX *ctx);
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static int check_trust(X509_STORE_CTX *ctx);
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static int check_revocation(X509_STORE_CTX *ctx);
static int check_cert(X509_STORE_CTX *ctx);
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static int check_policy(X509_STORE_CTX *ctx);
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static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x);
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static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
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                         unsigned int *preasons, X509_CRL *crl, X509 *x);
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static int get_crl_delta(X509_STORE_CTX *ctx,
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                         X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl,
                         int *pcrl_score, X509_CRL *base,
                         STACK_OF(X509_CRL) *crls);
static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl, X509 **pissuer,
                           int *pcrl_score);
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static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
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                           unsigned int *preasons);
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static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
static int check_crl_chain(X509_STORE_CTX *ctx,
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                           STACK_OF(X509) *cert_path,
                           STACK_OF(X509) *crl_path);
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static int internal_verify(X509_STORE_CTX *ctx);

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static int null_callback(int ok, X509_STORE_CTX *e)
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{
    return ok;
}
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/* Return 1 is a certificate is self signed */
static int cert_self_signed(X509 *x)
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{
    X509_check_purpose(x, -1, 0);
    if (x->ex_flags & EXFLAG_SS)
        return 1;
    else
        return 0;
}
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/* Given a certificate try and find an exact match in the store */

static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
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{
    STACK_OF(X509) *certs;
    X509 *xtmp = NULL;
    int i;
    /* Lookup all certs with matching subject name */
    certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
    if (certs == NULL)
        return NULL;
    /* Look for exact match */
    for (i = 0; i < sk_X509_num(certs); i++) {
        xtmp = sk_X509_value(certs, i);
        if (!X509_cmp(xtmp, x))
            break;
    }
    if (i < sk_X509_num(certs))
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        X509_up_ref(xtmp);
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    else
        xtmp = NULL;
    sk_X509_pop_free(certs, X509_free);
    return xtmp;
}
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int X509_verify_cert(X509_STORE_CTX *ctx)
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{
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    X509 *x, *xtmp, *xtmp2, *chain_ss = NULL;
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    int bad_chain = 0;
    X509_VERIFY_PARAM *param = ctx->param;
    int depth, i, ok = 0;
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    int num, j, retry;
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    int (*cb) (int xok, X509_STORE_CTX *xctx);
    STACK_OF(X509) *sktmp = NULL;
    if (ctx->cert == NULL) {
        X509err(X509_F_X509_VERIFY_CERT, X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
        return -1;
    }
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    if (ctx->chain != NULL) {
        /*
         * This X509_STORE_CTX has already been used to verify a cert. We
         * cannot do another one.
         */
        X509err(X509_F_X509_VERIFY_CERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return -1;
    }
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    cb = ctx->verify_cb;

    /*
     * first we make sure the chain we are going to build is present and that
     * the first entry is in place
     */
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    if (((ctx->chain = sk_X509_new_null()) == NULL) ||
        (!sk_X509_push(ctx->chain, ctx->cert))) {
        X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
        goto end;
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    }
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    X509_up_ref(ctx->cert);
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    ctx->last_untrusted = 1;
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    /* We use a temporary STACK so we can chop and hack at it */
    if (ctx->untrusted != NULL
        && (sktmp = sk_X509_dup(ctx->untrusted)) == NULL) {
        X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
        goto end;
    }

    num = sk_X509_num(ctx->chain);
    x = sk_X509_value(ctx->chain, num - 1);
    depth = param->depth;

    for (;;) {
        /* If we have enough, we break */
        if (depth < num)
            break;              /* FIXME: If this happens, we should take
                                 * note of it and, if appropriate, use the
                                 * X509_V_ERR_CERT_CHAIN_TOO_LONG error code
                                 * later. */

        /* If we are self signed, we break */
        if (cert_self_signed(x))
            break;
        /*
         * If asked see if we can find issuer in trusted store first
         */
        if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST) {
            ok = ctx->get_issuer(&xtmp, ctx, x);
            if (ok < 0)
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                goto end;
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            /*
             * If successful for now free up cert so it will be picked up
             * again later.
             */
            if (ok > 0) {
                X509_free(xtmp);
                break;
            }
        }

        /* If we were passed a cert chain, use it first */
        if (ctx->untrusted != NULL) {
            xtmp = find_issuer(ctx, sktmp, x);
            if (xtmp != NULL) {
                if (!sk_X509_push(ctx->chain, xtmp)) {
                    X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
                    goto end;
                }
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                X509_up_ref(xtmp);
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                (void)sk_X509_delete_ptr(sktmp, xtmp);
                ctx->last_untrusted++;
                x = xtmp;
                num++;
                /*
                 * reparse the full chain for the next one
                 */
                continue;
            }
        }
        break;
    }

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    /* Remember how many untrusted certs we have */
    j = num;
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    /*
     * at this point, chain should contain a list of untrusted certificates.
     * We now need to add at least one trusted one, if possible, otherwise we
     * complain.
     */

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    do {
        /*
         * Examine last certificate in chain and see if it is self signed.
         */
        i = sk_X509_num(ctx->chain);
        x = sk_X509_value(ctx->chain, i - 1);
        if (cert_self_signed(x)) {
            /* we have a self signed certificate */
            if (sk_X509_num(ctx->chain) == 1) {
                /*
                 * We have a single self signed certificate: see if we can
                 * find it in the store. We must have an exact match to avoid
                 * possible impersonation.
                 */
                ok = ctx->get_issuer(&xtmp, ctx, x);
                if ((ok <= 0) || X509_cmp(x, xtmp)) {
                    ctx->error = X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
                    ctx->current_cert = x;
                    ctx->error_depth = i - 1;
                    if (ok == 1)
                        X509_free(xtmp);
                    bad_chain = 1;
                    ok = cb(0, ctx);
                    if (!ok)
                        goto end;
                } else {
                    /*
                     * We have a match: replace certificate with store
                     * version so we get any trust settings.
                     */
                    X509_free(x);
                    x = xtmp;
                    (void)sk_X509_set(ctx->chain, i - 1, x);
                    ctx->last_untrusted = 0;
                }
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            } else {
                /*
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                 * extract and save self signed certificate for later use
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                 */
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                chain_ss = sk_X509_pop(ctx->chain);
                ctx->last_untrusted--;
                num--;
                j--;
                x = sk_X509_value(ctx->chain, num - 1);
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            }
        }
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        /* We now lookup certs from the certificate store */
        for (;;) {
            /* If we have enough, we break */
            if (depth < num)
                break;
            /* If we are self signed, we break */
            if (cert_self_signed(x))
                break;
            ok = ctx->get_issuer(&xtmp, ctx, x);
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            if (ok < 0)
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                goto end;
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            if (ok == 0)
                break;
            x = xtmp;
            if (!sk_X509_push(ctx->chain, x)) {
                X509_free(xtmp);
                X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
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                ok = 0;
                goto done;
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            }
            num++;
        }
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        /* we now have our chain, lets check it... */
        i = check_trust(ctx);
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        /* If explicitly rejected error */
        if (i == X509_TRUST_REJECTED)
            goto end;
        /*
         * If it's not explicitly trusted then check if there is an alternative
         * chain that could be used. We only do this if we haven't already
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         * checked via TRUSTED_FIRST and the user hasn't switched off alternate
         * chain checking
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         */
        retry = 0;
        if (i != X509_TRUST_TRUSTED
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            && !(ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
            && !(ctx->param->flags & X509_V_FLAG_NO_ALT_CHAINS)) {
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            while (j-- > 1) {
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                STACK_OF(X509) *chtmp = ctx->chain;
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                xtmp2 = sk_X509_value(ctx->chain, j - 1);
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                /*
                 * Temporarily set chain to NULL so we don't discount
                 * duplicates: the same certificate could be an untrusted
                 * CA found in the trusted store.
                 */
                ctx->chain = NULL;
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                ok = ctx->get_issuer(&xtmp, ctx, xtmp2);
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                ctx->chain = chtmp;
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                if (ok < 0)
                    goto end;
                /* Check if we found an alternate chain */
                if (ok > 0) {
                    /*
                     * Free up the found cert we'll add it again later
                     */
                    X509_free(xtmp);
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                    /*
                     * Dump all the certs above this point - we've found an
                     * alternate chain
                     */
                    while (num > j) {
                        xtmp = sk_X509_pop(ctx->chain);
                        X509_free(xtmp);
                        num--;
                    }
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                    ctx->last_untrusted = sk_X509_num(ctx->chain);
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                    retry = 1;
                    break;
                }
            }
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        }
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    } while (retry);
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    /*
     * If not explicitly trusted then indicate error unless it's a single
     * self signed certificate in which case we've indicated an error already
     * and set bad_chain == 1
     */
    if (i != X509_TRUST_TRUSTED && !bad_chain) {
        if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss)) {
            if (ctx->last_untrusted >= num)
                ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
            else
                ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
            ctx->current_cert = x;
        } else {

            sk_X509_push(ctx->chain, chain_ss);
            num++;
            ctx->last_untrusted = num;
            ctx->current_cert = chain_ss;
            ctx->error = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
            chain_ss = NULL;
        }

        ctx->error_depth = num - 1;
        bad_chain = 1;
        ok = cb(0, ctx);
        if (!ok)
            goto end;
    }

    /* We have the chain complete: now we need to check its purpose */
    ok = check_chain_extensions(ctx);

    if (!ok)
        goto end;

    /* Check name constraints */

    ok = check_name_constraints(ctx);

    if (!ok)
        goto end;

    ok = check_id(ctx);

    if (!ok)
        goto end;

    /* We may as well copy down any DSA parameters that are required */
    X509_get_pubkey_parameters(NULL, ctx->chain);

    /*
     * Check revocation status: we do this after copying parameters because
     * they may be needed for CRL signature verification.
     */

    ok = ctx->check_revocation(ctx);
    if (!ok)
        goto end;

    i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
                                ctx->param->flags);
    if (i != X509_V_OK) {
        ctx->error = i;
        ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
        ok = cb(0, ctx);
        if (!ok)
            goto end;
    }

    /* At this point, we have a chain and need to verify it */
    if (ctx->verify != NULL)
        ok = ctx->verify(ctx);
    else
        ok = internal_verify(ctx);
    if (!ok)
        goto end;
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#ifndef OPENSSL_NO_RFC3779
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    /* RFC 3779 path validation, now that CRL check has been done */
    ok = v3_asid_validate_path(ctx);
    if (!ok)
        goto end;
    ok = v3_addr_validate_path(ctx);
    if (!ok)
        goto end;
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#endif
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    /* If we get this far evaluate policies */
    if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
        ok = ctx->check_policy(ctx);
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    if (ok)
        goto done;

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 end:
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    X509_get_pubkey_parameters(NULL, ctx->chain);
 done:
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    sk_X509_free(sktmp);
    X509_free(chain_ss);
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    return ok;
}

/*
 * Given a STACK_OF(X509) find the issuer of cert (if any)
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 */

static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
{
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    int i;
    X509 *issuer, *rv = NULL;;
    for (i = 0; i < sk_X509_num(sk); i++) {
        issuer = sk_X509_value(sk, i);
        if (ctx->check_issued(ctx, x, issuer)) {
            rv = issuer;
            if (x509_check_cert_time(ctx, rv, 1))
                break;
        }
    }
    return rv;
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}

/* Given a possible certificate and issuer check them */

static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
{
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    int ret;
    if (x == issuer)
        return cert_self_signed(x);
    ret = X509_check_issued(issuer, x);
    if (ret == X509_V_OK) {
        int i;
        X509 *ch;
        /* Special case: single self signed certificate */
        if (cert_self_signed(x) && sk_X509_num(ctx->chain) == 1)
            return 1;
        for (i = 0; i < sk_X509_num(ctx->chain); i++) {
            ch = sk_X509_value(ctx->chain, i);
            if (ch == issuer || !X509_cmp(ch, issuer)) {
                ret = X509_V_ERR_PATH_LOOP;
                break;
            }
        }
    }

    if (ret == X509_V_OK)
        return 1;
    /* If we haven't asked for issuer errors don't set ctx */
    if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
        return 0;

    ctx->error = ret;
    ctx->current_cert = x;
    ctx->current_issuer = issuer;
    return ctx->verify_cb(0, ctx);
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}

/* Alternative lookup method: look from a STACK stored in other_ctx */

static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
{
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    *issuer = find_issuer(ctx, ctx->other_ctx, x);
    if (*issuer) {
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        X509_up_ref(*issuer);
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        return 1;
    } else
        return 0;
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}

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/*
 * Check a certificate chains extensions for consistency with the supplied
 * purpose
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 */

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static int check_chain_extensions(X509_STORE_CTX *ctx)
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{
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    int i, ok = 0, must_be_ca, plen = 0;
    X509 *x;
    int (*cb) (int xok, X509_STORE_CTX *xctx);
    int proxy_path_length = 0;
    int purpose;
    int allow_proxy_certs;
    cb = ctx->verify_cb;

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    /*-
     *  must_be_ca can have 1 of 3 values:
     * -1: we accept both CA and non-CA certificates, to allow direct
     *     use of self-signed certificates (which are marked as CA).
     * 0:  we only accept non-CA certificates.  This is currently not
     *     used, but the possibility is present for future extensions.
     * 1:  we only accept CA certificates.  This is currently used for
     *     all certificates in the chain except the leaf certificate.
     */
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    must_be_ca = -1;

    /* CRL path validation */
    if (ctx->parent) {
        allow_proxy_certs = 0;
        purpose = X509_PURPOSE_CRL_SIGN;
    } else {
        allow_proxy_certs =
            ! !(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
        /*
         * A hack to keep people who don't want to modify their software
         * happy
         */
        if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
            allow_proxy_certs = 1;
        purpose = ctx->param->purpose;
    }

    /* Check all untrusted certificates */
    for (i = 0; i < ctx->last_untrusted; i++) {
        int ret;
        x = sk_X509_value(ctx->chain, i);
        if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
            && (x->ex_flags & EXFLAG_CRITICAL)) {
            ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
            ctx->error_depth = i;
            ctx->current_cert = x;
            ok = cb(0, ctx);
            if (!ok)
                goto end;
        }
        if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY)) {
            ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
            ctx->error_depth = i;
            ctx->current_cert = x;
            ok = cb(0, ctx);
            if (!ok)
                goto end;
        }
        ret = X509_check_ca(x);
        switch (must_be_ca) {
        case -1:
            if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
                && (ret != 1) && (ret != 0)) {
                ret = 0;
                ctx->error = X509_V_ERR_INVALID_CA;
            } else
                ret = 1;
            break;
        case 0:
            if (ret != 0) {
                ret = 0;
                ctx->error = X509_V_ERR_INVALID_NON_CA;
            } else
                ret = 1;
            break;
        default:
            if ((ret == 0)
                || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
                    && (ret != 1))) {
                ret = 0;
                ctx->error = X509_V_ERR_INVALID_CA;
            } else
                ret = 1;
            break;
        }
        if (ret == 0) {
            ctx->error_depth = i;
            ctx->current_cert = x;
            ok = cb(0, ctx);
            if (!ok)
                goto end;
        }
        if (ctx->param->purpose > 0) {
            ret = X509_check_purpose(x, purpose, must_be_ca > 0);
            if ((ret == 0)
                || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
                    && (ret != 1))) {
                ctx->error = X509_V_ERR_INVALID_PURPOSE;
                ctx->error_depth = i;
                ctx->current_cert = x;
                ok = cb(0, ctx);
                if (!ok)
                    goto end;
            }
        }
        /* Check pathlen if not self issued */
        if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
            && (x->ex_pathlen != -1)
            && (plen > (x->ex_pathlen + proxy_path_length + 1))) {
            ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
            ctx->error_depth = i;
            ctx->current_cert = x;
            ok = cb(0, ctx);
            if (!ok)
                goto end;
        }
        /* Increment path length if not self issued */
        if (!(x->ex_flags & EXFLAG_SI))
            plen++;
        /*
         * If this certificate is a proxy certificate, the next certificate
         * must be another proxy certificate or a EE certificate.  If not,
         * the next certificate must be a CA certificate.
         */
        if (x->ex_flags & EXFLAG_PROXY) {
            if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen) {
                ctx->error = X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
                ctx->error_depth = i;
                ctx->current_cert = x;
                ok = cb(0, ctx);
                if (!ok)
                    goto end;
            }
            proxy_path_length++;
            must_be_ca = 0;
        } else
            must_be_ca = 1;
    }
    ok = 1;
722
 end:
723
    return ok;
724 725
}

726
static int check_name_constraints(X509_STORE_CTX *ctx)
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
{
    X509 *x;
    int i, j, rv;
    /* Check name constraints for all certificates */
    for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--) {
        x = sk_X509_value(ctx->chain, i);
        /* Ignore self issued certs unless last in chain */
        if (i && (x->ex_flags & EXFLAG_SI))
            continue;
        /*
         * Check against constraints for all certificates higher in chain
         * including trust anchor. Trust anchor not strictly speaking needed
         * but if it includes constraints it is to be assumed it expects them
         * to be obeyed.
         */
        for (j = sk_X509_num(ctx->chain) - 1; j > i; j--) {
            NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
            if (nc) {
                rv = NAME_CONSTRAINTS_check(x, nc);
                if (rv != X509_V_OK) {
                    ctx->error = rv;
                    ctx->error_depth = i;
                    ctx->current_cert = x;
                    if (!ctx->verify_cb(0, ctx))
                        return 0;
                }
            }
        }
    }
    return 1;
}
758

759
static int check_id_error(X509_STORE_CTX *ctx, int errcode)
760 761 762 763 764 765
{
    ctx->error = errcode;
    ctx->current_cert = ctx->cert;
    ctx->error_depth = 0;
    return ctx->verify_cb(0, ctx);
}
766

D
Dr. Stephen Henson 已提交
767
static int check_hosts(X509 *x, X509_VERIFY_PARAM *vpm)
768 769
{
    int i;
D
Dr. Stephen Henson 已提交
770
    int n = sk_OPENSSL_STRING_num(vpm->hosts);
771 772
    char *name;

D
Dr. Stephen Henson 已提交
773 774 775
    if (vpm->peername != NULL) {
        OPENSSL_free(vpm->peername);
        vpm->peername = NULL;
776
    }
777
    for (i = 0; i < n; ++i) {
D
Dr. Stephen Henson 已提交
778 779
        name = sk_OPENSSL_STRING_value(vpm->hosts, i);
        if (X509_check_host(x, name, 0, vpm->hostflags, &vpm->peername) > 0)
780 781 782 783
            return 1;
    }
    return n == 0;
}
784

785
static int check_id(X509_STORE_CTX *ctx)
786 787 788
{
    X509_VERIFY_PARAM *vpm = ctx->param;
    X509 *x = ctx->cert;
D
Dr. Stephen Henson 已提交
789
    if (vpm->hosts && check_hosts(x, vpm) <= 0) {
790 791 792
        if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
            return 0;
    }
D
Dr. Stephen Henson 已提交
793
    if (vpm->email && X509_check_email(x, vpm->email, vpm->emaillen, 0) <= 0) {
794 795 796
        if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
            return 0;
    }
D
Dr. Stephen Henson 已提交
797
    if (vpm->ip && X509_check_ip(x, vpm->ip, vpm->iplen, 0) <= 0) {
798 799 800 801 802
        if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
            return 0;
    }
    return 1;
}
803

804 805
static int check_trust(X509_STORE_CTX *ctx)
{
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852
    int i, ok;
    X509 *x = NULL;
    int (*cb) (int xok, X509_STORE_CTX *xctx);
    cb = ctx->verify_cb;
    /* Check all trusted certificates in chain */
    for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++) {
        x = sk_X509_value(ctx->chain, i);
        ok = X509_check_trust(x, ctx->param->trust, 0);
        /* If explicitly trusted return trusted */
        if (ok == X509_TRUST_TRUSTED)
            return X509_TRUST_TRUSTED;
        /*
         * If explicitly rejected notify callback and reject if not
         * overridden.
         */
        if (ok == X509_TRUST_REJECTED) {
            ctx->error_depth = i;
            ctx->current_cert = x;
            ctx->error = X509_V_ERR_CERT_REJECTED;
            ok = cb(0, ctx);
            if (!ok)
                return X509_TRUST_REJECTED;
        }
    }
    /*
     * If we accept partial chains and have at least one trusted certificate
     * return success.
     */
    if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
        X509 *mx;
        if (ctx->last_untrusted < sk_X509_num(ctx->chain))
            return X509_TRUST_TRUSTED;
        x = sk_X509_value(ctx->chain, 0);
        mx = lookup_cert_match(ctx, x);
        if (mx) {
            (void)sk_X509_set(ctx->chain, 0, mx);
            X509_free(x);
            ctx->last_untrusted = 0;
            return X509_TRUST_TRUSTED;
        }
    }

    /*
     * If no trusted certs in chain at all return untrusted and allow
     * standard (no issuer cert) etc errors to be indicated.
     */
    return X509_TRUST_UNTRUSTED;
853 854
}

D
 
Dr. Stephen Henson 已提交
855
static int check_revocation(X509_STORE_CTX *ctx)
856
{
857
    int i = 0, last = 0, ok = 0;
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
    if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
        return 1;
    if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
        last = sk_X509_num(ctx->chain) - 1;
    else {
        /* If checking CRL paths this isn't the EE certificate */
        if (ctx->parent)
            return 1;
        last = 0;
    }
    for (i = 0; i <= last; i++) {
        ctx->error_depth = i;
        ok = check_cert(ctx);
        if (!ok)
            return ok;
    }
    return 1;
}
D
 
Dr. Stephen Henson 已提交
876 877

static int check_cert(X509_STORE_CTX *ctx)
878 879
{
    X509_CRL *crl = NULL, *dcrl = NULL;
880 881 882
    X509 *x = NULL;
    int ok = 0, cnum = 0;
    unsigned int last_reasons = 0;
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
    cnum = ctx->error_depth;
    x = sk_X509_value(ctx->chain, cnum);
    ctx->current_cert = x;
    ctx->current_issuer = NULL;
    ctx->current_crl_score = 0;
    ctx->current_reasons = 0;
    while (ctx->current_reasons != CRLDP_ALL_REASONS) {
        last_reasons = ctx->current_reasons;
        /* Try to retrieve relevant CRL */
        if (ctx->get_crl)
            ok = ctx->get_crl(ctx, &crl, x);
        else
            ok = get_crl_delta(ctx, &crl, &dcrl, x);
        /*
         * If error looking up CRL, nothing we can do except notify callback
         */
        if (!ok) {
            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
            ok = ctx->verify_cb(0, ctx);
            goto err;
        }
        ctx->current_crl = crl;
        ok = ctx->check_crl(ctx, crl);
        if (!ok)
            goto err;

        if (dcrl) {
            ok = ctx->check_crl(ctx, dcrl);
            if (!ok)
                goto err;
            ok = ctx->cert_crl(ctx, dcrl, x);
            if (!ok)
                goto err;
        } else
            ok = 1;

        /* Don't look in full CRL if delta reason is removefromCRL */
        if (ok != 2) {
            ok = ctx->cert_crl(ctx, crl, x);
            if (!ok)
                goto err;
        }

        X509_CRL_free(crl);
        X509_CRL_free(dcrl);
        crl = NULL;
        dcrl = NULL;
        /*
         * If reasons not updated we wont get anywhere by another iteration,
         * so exit loop.
         */
        if (last_reasons == ctx->current_reasons) {
            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
            ok = ctx->verify_cb(0, ctx);
            goto err;
        }
    }
 err:
    X509_CRL_free(crl);
    X509_CRL_free(dcrl);

    ctx->current_crl = NULL;
    return ok;

}
D
 
Dr. Stephen Henson 已提交
948

949 950 951
/* Check CRL times against values in X509_STORE_CTX */

static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
952 953 954 955 956 957 958
{
    time_t *ptime;
    int i;
    if (notify)
        ctx->current_crl = crl;
    if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
        ptime = &ctx->param->check_time;
959 960
    else if (ctx->param->flags & X509_V_FLAG_NO_CHECK_TIME)
        return 1;
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
    else
        ptime = NULL;

    i = X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
    if (i == 0) {
        if (!notify)
            return 0;
        ctx->error = X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
        if (!ctx->verify_cb(0, ctx))
            return 0;
    }

    if (i > 0) {
        if (!notify)
            return 0;
        ctx->error = X509_V_ERR_CRL_NOT_YET_VALID;
        if (!ctx->verify_cb(0, ctx))
            return 0;
    }

    if (X509_CRL_get_nextUpdate(crl)) {
        i = X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);

        if (i == 0) {
            if (!notify)
                return 0;
            ctx->error = X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
            if (!ctx->verify_cb(0, ctx))
                return 0;
        }
        /* Ignore expiry of base CRL is delta is valid */
        if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA)) {
            if (!notify)
                return 0;
            ctx->error = X509_V_ERR_CRL_HAS_EXPIRED;
            if (!ctx->verify_cb(0, ctx))
                return 0;
        }
    }

    if (notify)
        ctx->current_crl = NULL;

    return 1;
}
1006

1007
static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
                      X509 **pissuer, int *pscore, unsigned int *preasons,
                      STACK_OF(X509_CRL) *crls)
{
    int i, crl_score, best_score = *pscore;
    unsigned int reasons, best_reasons = 0;
    X509 *x = ctx->current_cert;
    X509_CRL *crl, *best_crl = NULL;
    X509 *crl_issuer = NULL, *best_crl_issuer = NULL;

    for (i = 0; i < sk_X509_CRL_num(crls); i++) {
        crl = sk_X509_CRL_value(crls, i);
        reasons = *preasons;
        crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);

        if (crl_score > best_score) {
            best_crl = crl;
            best_crl_issuer = crl_issuer;
            best_score = crl_score;
            best_reasons = reasons;
        }
    }

    if (best_crl) {
R
Rich Salz 已提交
1031
        X509_CRL_free(*pcrl);
1032 1033 1034 1035
        *pcrl = best_crl;
        *pissuer = best_crl_issuer;
        *pscore = best_score;
        *preasons = best_reasons;
1036
        X509_CRL_up_ref(best_crl);
R
Rich Salz 已提交
1037 1038
        X509_CRL_free(*pdcrl);
        *pdcrl = NULL;
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
        get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
    }

    if (best_score >= CRL_SCORE_VALID)
        return 1;

    return 0;
}

/*
 * Compare two CRL extensions for delta checking purposes. They should be
1050 1051 1052 1053
 * both present or both absent. If both present all fields must be identical.
 */

static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
{
    ASN1_OCTET_STRING *exta, *extb;
    int i;
    i = X509_CRL_get_ext_by_NID(a, nid, -1);
    if (i >= 0) {
        /* Can't have multiple occurrences */
        if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
            return 0;
        exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
    } else
        exta = NULL;
1065

1066
    i = X509_CRL_get_ext_by_NID(b, nid, -1);
1067

1068
    if (i >= 0) {
1069

1070 1071 1072 1073 1074
        if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
            return 0;
        extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
    } else
        extb = NULL;
1075

1076 1077
    if (!exta && !extb)
        return 1;
1078

1079 1080
    if (!exta || !extb)
        return 0;
1081

1082 1083
    if (ASN1_OCTET_STRING_cmp(exta, extb))
        return 0;
1084

1085 1086
    return 1;
}
1087 1088 1089 1090

/* See if a base and delta are compatible */

static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
{
    /* Delta CRL must be a delta */
    if (!delta->base_crl_number)
        return 0;
    /* Base must have a CRL number */
    if (!base->crl_number)
        return 0;
    /* Issuer names must match */
    if (X509_NAME_cmp(X509_CRL_get_issuer(base), X509_CRL_get_issuer(delta)))
        return 0;
    /* AKID and IDP must match */
    if (!crl_extension_match(delta, base, NID_authority_key_identifier))
        return 0;
    if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
        return 0;
    /* Delta CRL base number must not exceed Full CRL number. */
    if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
        return 0;
    /* Delta CRL number must exceed full CRL number */
    if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
        return 1;
    return 0;
}

/*
 * For a given base CRL find a delta... maybe extend to delta scoring or
 * retrieve a chain of deltas...
1118 1119 1120
 */

static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133
                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
{
    X509_CRL *delta;
    int i;
    if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
        return;
    if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
        return;
    for (i = 0; i < sk_X509_CRL_num(crls); i++) {
        delta = sk_X509_CRL_value(crls, i);
        if (check_delta_base(delta, base)) {
            if (check_crl_time(ctx, delta, 0))
                *pscore |= CRL_SCORE_TIME_DELTA;
1134
            X509_CRL_up_ref(delta);
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
            *dcrl = delta;
            return;
        }
    }
    *dcrl = NULL;
}

/*
 * For a given CRL return how suitable it is for the supplied certificate
 * 'x'. The return value is a mask of several criteria. If the issuer is not
 * the certificate issuer this is returned in *pissuer. The reasons mask is
 * also used to determine if the CRL is suitable: if no new reasons the CRL
 * is rejected, otherwise reasons is updated.
1148 1149 1150
 */

static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
                         unsigned int *preasons, X509_CRL *crl, X509 *x)
{

    int crl_score = 0;
    unsigned int tmp_reasons = *preasons, crl_reasons;

    /* First see if we can reject CRL straight away */

    /* Invalid IDP cannot be processed */
    if (crl->idp_flags & IDP_INVALID)
        return 0;
    /* Reason codes or indirect CRLs need extended CRL support */
    if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT)) {
        if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
            return 0;
    } else if (crl->idp_flags & IDP_REASONS) {
        /* If no new reasons reject */
        if (!(crl->idp_reasons & ~tmp_reasons))
            return 0;
    }
    /* Don't process deltas at this stage */
    else if (crl->base_crl_number)
        return 0;
    /* If issuer name doesn't match certificate need indirect CRL */
    if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl))) {
        if (!(crl->idp_flags & IDP_INDIRECT))
            return 0;
    } else
        crl_score |= CRL_SCORE_ISSUER_NAME;

    if (!(crl->flags & EXFLAG_CRITICAL))
        crl_score |= CRL_SCORE_NOCRITICAL;

    /* Check expiry */
    if (check_crl_time(ctx, crl, 0))
        crl_score |= CRL_SCORE_TIME;

    /* Check authority key ID and locate certificate issuer */
    crl_akid_check(ctx, crl, pissuer, &crl_score);

    /* If we can't locate certificate issuer at this point forget it */

    if (!(crl_score & CRL_SCORE_AKID))
        return 0;

    /* Check cert for matching CRL distribution points */

    if (crl_crldp_check(x, crl, crl_score, &crl_reasons)) {
        /* If no new reasons reject */
        if (!(crl_reasons & ~tmp_reasons))
            return 0;
        tmp_reasons |= crl_reasons;
        crl_score |= CRL_SCORE_SCOPE;
    }

    *preasons = tmp_reasons;

    return crl_score;

}
1211 1212

static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
                           X509 **pissuer, int *pcrl_score)
{
    X509 *crl_issuer = NULL;
    X509_NAME *cnm = X509_CRL_get_issuer(crl);
    int cidx = ctx->error_depth;
    int i;

    if (cidx != sk_X509_num(ctx->chain) - 1)
        cidx++;

    crl_issuer = sk_X509_value(ctx->chain, cidx);

    if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
        if (*pcrl_score & CRL_SCORE_ISSUER_NAME) {
            *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_ISSUER_CERT;
            *pissuer = crl_issuer;
            return;
        }
    }

    for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++) {
        crl_issuer = sk_X509_value(ctx->chain, cidx);
        if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
            continue;
        if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
            *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_SAME_PATH;
            *pissuer = crl_issuer;
            return;
        }
    }

    /* Anything else needs extended CRL support */

    if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
        return;

    /*
     * Otherwise the CRL issuer is not on the path. Look for it in the set of
     * untrusted certificates.
     */
    for (i = 0; i < sk_X509_num(ctx->untrusted); i++) {
        crl_issuer = sk_X509_value(ctx->untrusted, i);
        if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
            continue;
        if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
            *pissuer = crl_issuer;
            *pcrl_score |= CRL_SCORE_AKID;
            return;
        }
    }
}

/*
 * Check the path of a CRL issuer certificate. This creates a new
1267
 * X509_STORE_CTX and populates it with most of the parameters from the
1268 1269
 * parent. This could be optimised somewhat since a lot of path checking will
 * be duplicated by the parent, but this will rarely be used in practice.
1270 1271 1272
 */

static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
{
    X509_STORE_CTX crl_ctx;
    int ret;
    /* Don't allow recursive CRL path validation */
    if (ctx->parent)
        return 0;
    if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
        return -1;

    crl_ctx.crls = ctx->crls;
    /* Copy verify params across */
    X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);

    crl_ctx.parent = ctx;
    crl_ctx.verify_cb = ctx->verify_cb;

    /* Verify CRL issuer */
    ret = X509_verify_cert(&crl_ctx);

    if (ret <= 0)
        goto err;

    /* Check chain is acceptable */

    ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
 err:
    X509_STORE_CTX_cleanup(&crl_ctx);
    return ret;
}

/*
 * RFC3280 says nothing about the relationship between CRL path and
 * certificate path, which could lead to situations where a certificate could
 * be revoked or validated by a CA not authorised to do so. RFC5280 is more
 * strict and states that the two paths must end in the same trust anchor,
 * though some discussions remain... until this is resolved we use the
 * RFC5280 version
1310 1311 1312
 */

static int check_crl_chain(X509_STORE_CTX *ctx,
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322
                           STACK_OF(X509) *cert_path,
                           STACK_OF(X509) *crl_path)
{
    X509 *cert_ta, *crl_ta;
    cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
    crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
    if (!X509_cmp(cert_ta, crl_ta))
        return 1;
    return 0;
}
1323

1324 1325
/*-
 * Check for match between two dist point names: three separate cases.
1326 1327 1328
 * 1. Both are relative names and compare X509_NAME types.
 * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
 * 3. Both are full names and compare two GENERAL_NAMES.
1329
 * 4. One is NULL: automatic match.
1330 1331 1332
 */

static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
{
    X509_NAME *nm = NULL;
    GENERAL_NAMES *gens = NULL;
    GENERAL_NAME *gena, *genb;
    int i, j;
    if (!a || !b)
        return 1;
    if (a->type == 1) {
        if (!a->dpname)
            return 0;
        /* Case 1: two X509_NAME */
        if (b->type == 1) {
            if (!b->dpname)
                return 0;
            if (!X509_NAME_cmp(a->dpname, b->dpname))
                return 1;
            else
                return 0;
        }
        /* Case 2: set name and GENERAL_NAMES appropriately */
        nm = a->dpname;
        gens = b->name.fullname;
    } else if (b->type == 1) {
        if (!b->dpname)
            return 0;
        /* Case 2: set name and GENERAL_NAMES appropriately */
        gens = a->name.fullname;
        nm = b->dpname;
    }

    /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
    if (nm) {
        for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
            gena = sk_GENERAL_NAME_value(gens, i);
            if (gena->type != GEN_DIRNAME)
                continue;
            if (!X509_NAME_cmp(nm, gena->d.directoryName))
                return 1;
        }
        return 0;
    }

    /* Else case 3: two GENERAL_NAMES */

    for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++) {
        gena = sk_GENERAL_NAME_value(a->name.fullname, i);
        for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++) {
            genb = sk_GENERAL_NAME_value(b->name.fullname, j);
            if (!GENERAL_NAME_cmp(gena, genb))
                return 1;
        }
    }

    return 0;

}
1389

1390
static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
{
    int i;
    X509_NAME *nm = X509_CRL_get_issuer(crl);
    /* If no CRLissuer return is successful iff don't need a match */
    if (!dp->CRLissuer)
        return ! !(crl_score & CRL_SCORE_ISSUER_NAME);
    for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
        GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
        if (gen->type != GEN_DIRNAME)
            continue;
        if (!X509_NAME_cmp(gen->d.directoryName, nm))
            return 1;
    }
    return 0;
}
1406

1407
/* Check CRLDP and IDP */
1408

1409
static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440
                           unsigned int *preasons)
{
    int i;
    if (crl->idp_flags & IDP_ONLYATTR)
        return 0;
    if (x->ex_flags & EXFLAG_CA) {
        if (crl->idp_flags & IDP_ONLYUSER)
            return 0;
    } else {
        if (crl->idp_flags & IDP_ONLYCA)
            return 0;
    }
    *preasons = crl->idp_reasons;
    for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) {
        DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
        if (crldp_check_crlissuer(dp, crl, crl_score)) {
            if (!crl->idp || idp_check_dp(dp->distpoint, crl->idp->distpoint)) {
                *preasons &= dp->dp_reasons;
                return 1;
            }
        }
    }
    if ((!crl->idp || !crl->idp->distpoint)
        && (crl_score & CRL_SCORE_ISSUER_NAME))
        return 1;
    return 0;
}

/*
 * Retrieve CRL corresponding to current certificate. If deltas enabled try
 * to find a delta CRL too
D
 
Dr. Stephen Henson 已提交
1441
 */
1442

1443
static int get_crl_delta(X509_STORE_CTX *ctx,
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
                         X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
{
    int ok;
    X509 *issuer = NULL;
    int crl_score = 0;
    unsigned int reasons;
    X509_CRL *crl = NULL, *dcrl = NULL;
    STACK_OF(X509_CRL) *skcrl;
    X509_NAME *nm = X509_get_issuer_name(x);
    reasons = ctx->current_reasons;
    ok = get_crl_sk(ctx, &crl, &dcrl,
                    &issuer, &crl_score, &reasons, ctx->crls);

    if (ok)
        goto done;

    /* Lookup CRLs from store */

    skcrl = ctx->lookup_crls(ctx, nm);

    /* If no CRLs found and a near match from get_crl_sk use that */
    if (!skcrl && crl)
        goto done;

    get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);

    sk_X509_CRL_pop_free(skcrl, X509_CRL_free);

 done:

    /* If we got any kind of CRL use it and return success */
    if (crl) {
        ctx->current_issuer = issuer;
        ctx->current_crl_score = crl_score;
        ctx->current_reasons = reasons;
        *pcrl = crl;
        *pdcrl = dcrl;
        return 1;
    }

    return 0;
}
D
 
Dr. Stephen Henson 已提交
1486 1487 1488

/* Check CRL validity */
static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
{
    X509 *issuer = NULL;
    EVP_PKEY *ikey = NULL;
    int ok = 0, chnum, cnum;
    cnum = ctx->error_depth;
    chnum = sk_X509_num(ctx->chain) - 1;
    /* if we have an alternative CRL issuer cert use that */
    if (ctx->current_issuer)
        issuer = ctx->current_issuer;

    /*
     * Else find CRL issuer: if not last certificate then issuer is next
     * certificate in chain.
     */
    else if (cnum < chnum)
        issuer = sk_X509_value(ctx->chain, cnum + 1);
    else {
        issuer = sk_X509_value(ctx->chain, chnum);
        /* If not self signed, can't check signature */
        if (!ctx->check_issued(ctx, issuer, issuer)) {
            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
            ok = ctx->verify_cb(0, ctx);
            if (!ok)
                goto err;
        }
    }

    if (issuer) {
        /*
         * Skip most tests for deltas because they have already been done
         */
        if (!crl->base_crl_number) {
            /* Check for cRLSign bit if keyUsage present */
            if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
                !(issuer->ex_kusage & KU_CRL_SIGN)) {
                ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
                ok = ctx->verify_cb(0, ctx);
                if (!ok)
                    goto err;
            }

            if (!(ctx->current_crl_score & CRL_SCORE_SCOPE)) {
                ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
                ok = ctx->verify_cb(0, ctx);
                if (!ok)
                    goto err;
            }

            if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH)) {
                if (check_crl_path(ctx, ctx->current_issuer) <= 0) {
                    ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
                    ok = ctx->verify_cb(0, ctx);
                    if (!ok)
                        goto err;
                }
            }

            if (crl->idp_flags & IDP_INVALID) {
                ctx->error = X509_V_ERR_INVALID_EXTENSION;
                ok = ctx->verify_cb(0, ctx);
                if (!ok)
                    goto err;
            }

        }

        if (!(ctx->current_crl_score & CRL_SCORE_TIME)) {
            ok = check_crl_time(ctx, crl, 1);
            if (!ok)
                goto err;
        }

        /* Attempt to get issuer certificate public key */
        ikey = X509_get_pubkey(issuer);

        if (!ikey) {
            ctx->error = X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
            ok = ctx->verify_cb(0, ctx);
            if (!ok)
                goto err;
        } else {
            int rv;
            rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
            if (rv != X509_V_OK) {
                ctx->error = rv;
                ok = ctx->verify_cb(0, ctx);
                if (!ok)
                    goto err;
            }
            /* Verify CRL signature */
            if (X509_CRL_verify(crl, ikey) <= 0) {
                ctx->error = X509_V_ERR_CRL_SIGNATURE_FAILURE;
                ok = ctx->verify_cb(0, ctx);
                if (!ok)
                    goto err;
            }
        }
    }

    ok = 1;

 err:
    EVP_PKEY_free(ikey);
    return ok;
}
D
 
Dr. Stephen Henson 已提交
1594 1595 1596

/* Check certificate against CRL */
static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
{
    int ok;
    X509_REVOKED *rev;
    /*
     * The rules changed for this... previously if a CRL contained unhandled
     * critical extensions it could still be used to indicate a certificate
     * was revoked. This has since been changed since critical extension can
     * change the meaning of CRL entries.
     */
    if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
        && (crl->flags & EXFLAG_CRITICAL)) {
        ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
        ok = ctx->verify_cb(0, ctx);
        if (!ok)
            return 0;
    }
    /*
     * Look for serial number of certificate in CRL If found make sure reason
     * is not removeFromCRL.
     */
    if (X509_CRL_get0_by_cert(crl, &rev, x)) {
        if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
            return 2;
        ctx->error = X509_V_ERR_CERT_REVOKED;
        ok = ctx->verify_cb(0, ctx);
        if (!ok)
            return 0;
    }

    return 1;
}
D
 
Dr. Stephen Henson 已提交
1628

1629
static int check_policy(X509_STORE_CTX *ctx)
1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
{
    int ret;
    if (ctx->parent)
        return 1;
    ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
                            ctx->param->policies, ctx->param->flags);
    if (ret == 0) {
        X509err(X509_F_CHECK_POLICY, ERR_R_MALLOC_FAILURE);
        return 0;
    }
    /* Invalid or inconsistent extensions */
    if (ret == -1) {
        /*
         * Locate certificates with bad extensions and notify callback.
         */
        X509 *x;
        int i;
        for (i = 1; i < sk_X509_num(ctx->chain); i++) {
            x = sk_X509_value(ctx->chain, i);
            if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
                continue;
            ctx->current_cert = x;
            ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
            if (!ctx->verify_cb(0, ctx))
                return 0;
        }
        return 1;
    }
    if (ret == -2) {
        ctx->current_cert = NULL;
        ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
        return ctx->verify_cb(0, ctx);
    }

    if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY) {
        ctx->current_cert = NULL;
        ctx->error = X509_V_OK;
        if (!ctx->verify_cb(2, ctx))
            return 0;
    }

    return 1;
}
1673

1674
int x509_check_cert_time(X509_STORE_CTX *ctx, X509 *x, int quiet)
1675 1676 1677 1678 1679 1680
{
    time_t *ptime;
    int i;

    if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
        ptime = &ctx->param->check_time;
1681 1682
    else if (ctx->param->flags & X509_V_FLAG_NO_CHECK_TIME)
        return 1;
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
    else
        ptime = NULL;

    i = X509_cmp_time(X509_get_notBefore(x), ptime);
    if (i == 0) {
        if (quiet)
            return 0;
        ctx->error = X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
        ctx->current_cert = x;
        if (!ctx->verify_cb(0, ctx))
            return 0;
    }

    if (i > 0) {
        if (quiet)
            return 0;
        ctx->error = X509_V_ERR_CERT_NOT_YET_VALID;
        ctx->current_cert = x;
        if (!ctx->verify_cb(0, ctx))
            return 0;
    }

    i = X509_cmp_time(X509_get_notAfter(x), ptime);
    if (i == 0) {
        if (quiet)
            return 0;
        ctx->error = X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
        ctx->current_cert = x;
        if (!ctx->verify_cb(0, ctx))
            return 0;
    }

    if (i < 0) {
        if (quiet)
            return 0;
        ctx->error = X509_V_ERR_CERT_HAS_EXPIRED;
        ctx->current_cert = x;
        if (!ctx->verify_cb(0, ctx))
            return 0;
    }

    return 1;
}
1726

U
Ulf Möller 已提交
1727
static int internal_verify(X509_STORE_CTX *ctx)
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
{
    int ok = 0, n;
    X509 *xs, *xi;
    EVP_PKEY *pkey = NULL;
    int (*cb) (int xok, X509_STORE_CTX *xctx);

    cb = ctx->verify_cb;

    n = sk_X509_num(ctx->chain);
    ctx->error_depth = n - 1;
    n--;
    xi = sk_X509_value(ctx->chain, n);

    if (ctx->check_issued(ctx, xi, xi))
        xs = xi;
    else {
        if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
            xs = xi;
            goto check_cert;
        }
        if (n <= 0) {
            ctx->error = X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
            ctx->current_cert = xi;
            ok = cb(0, ctx);
            goto end;
        } else {
            n--;
            ctx->error_depth = n;
            xs = sk_X509_value(ctx->chain, n);
        }
    }

/*      ctx->error=0;  not needed */
    while (n >= 0) {
        ctx->error_depth = n;

        /*
         * Skip signature check for self signed certificates unless
         * explicitly asked for. It doesn't add any security and just wastes
         * time.
         */
        if (!xs->valid
            && (xs != xi
                || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE))) {
            if ((pkey = X509_get_pubkey(xi)) == NULL) {
                ctx->error = X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
                ctx->current_cert = xi;
                ok = (*cb) (0, ctx);
                if (!ok)
                    goto end;
            } else if (X509_verify(xs, pkey) <= 0) {
                ctx->error = X509_V_ERR_CERT_SIGNATURE_FAILURE;
                ctx->current_cert = xs;
                ok = (*cb) (0, ctx);
                if (!ok) {
                    EVP_PKEY_free(pkey);
                    goto end;
                }
            }
            EVP_PKEY_free(pkey);
            pkey = NULL;
        }

        xs->valid = 1;

 check_cert:
        ok = x509_check_cert_time(ctx, xs, 0);
        if (!ok)
            goto end;

        /* The last error (if any) is still in the error value */
        ctx->current_issuer = xi;
        ctx->current_cert = xs;
        ok = (*cb) (1, ctx);
        if (!ok)
            goto end;

        n--;
        if (n >= 0) {
            xi = xs;
            xs = sk_X509_value(ctx->chain, n);
        }
    }
    ok = 1;
 end:
    return ok;
}
1815

N
Nils Larsch 已提交
1816
int X509_cmp_current_time(const ASN1_TIME *ctm)
D
Dr. Stephen Henson 已提交
1817
{
1818
    return X509_cmp_time(ctm, NULL);
D
Dr. Stephen Henson 已提交
1819 1820
}

N
Nils Larsch 已提交
1821
int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1822 1823 1824 1825 1826
{
    char *str;
    ASN1_TIME atm;
    long offset;
    char buff1[24], buff2[24], *p;
1827
    int i, j, remaining;
1828 1829

    p = buff1;
1830
    remaining = ctm->length;
1831
    str = (char *)ctm->data;
1832 1833 1834 1835 1836 1837
    /*
     * Note that the following (historical) code allows much more slack in the
     * time format than RFC5280. In RFC5280, the representation is fixed:
     * UTCTime: YYMMDDHHMMSSZ
     * GeneralizedTime: YYYYMMDDHHMMSSZ
     */
1838
    if (ctm->type == V_ASN1_UTCTIME) {
1839 1840 1841 1842
        /* YYMMDDHHMM[SS]Z or YYMMDDHHMM[SS](+-)hhmm */
        int min_length = sizeof("YYMMDDHHMMZ") - 1;
        int max_length = sizeof("YYMMDDHHMMSS+hhmm") - 1;
        if (remaining < min_length || remaining > max_length)
1843 1844 1845 1846
            return 0;
        memcpy(p, str, 10);
        p += 10;
        str += 10;
1847
        remaining -= 10;
1848
    } else {
1849 1850 1851 1852
        /* YYYYMMDDHHMM[SS[.fff]]Z or YYYYMMDDHHMM[SS[.f[f[f]]]](+-)hhmm */
        int min_length = sizeof("YYYYMMDDHHMMZ") - 1;
        int max_length = sizeof("YYYYMMDDHHMMSS.fff+hhmm") - 1;
        if (remaining < min_length || remaining > max_length)
1853 1854 1855 1856
            return 0;
        memcpy(p, str, 12);
        p += 12;
        str += 12;
1857
        remaining -= 12;
1858 1859 1860 1861 1862 1863
    }

    if ((*str == 'Z') || (*str == '-') || (*str == '+')) {
        *(p++) = '0';
        *(p++) = '0';
    } else {
1864 1865 1866
        /* SS (seconds) */
        if (remaining < 2)
            return 0;
1867 1868
        *(p++) = *(str++);
        *(p++) = *(str++);
1869 1870 1871 1872 1873 1874 1875
        remaining -= 2;
        /*
         * Skip any (up to three) fractional seconds...
         * TODO(emilia): in RFC5280, fractional seconds are forbidden.
         * Can we just kill them altogether?
         */
        if (remaining && *str == '.') {
1876
            str++;
1877 1878 1879 1880 1881
            remaining--;
            for (i = 0; i < 3 && remaining; i++, str++, remaining--) {
                if (*str < '0' || *str > '9')
                    break;
            }
1882 1883 1884 1885 1886 1887
        }

    }
    *(p++) = 'Z';
    *(p++) = '\0';

1888 1889 1890 1891 1892 1893
    /* We now need either a terminating 'Z' or an offset. */
    if (!remaining)
        return 0;
    if (*str == 'Z') {
        if (remaining != 1)
            return 0;
1894
        offset = 0;
1895 1896
    } else {
        /* (+-)HHMM */
1897 1898
        if ((*str != '+') && (*str != '-'))
            return 0;
1899 1900 1901 1902 1903 1904
        /* Historical behaviour: the (+-)hhmm offset is forbidden in RFC5280. */
        if (remaining != 5)
            return 0;
        if (str[1] < '0' || str[1] > '9' || str[2] < '0' || str[2] > '9' ||
            str[3] < '0' || str[3] > '9' || str[4] < '0' || str[4] > '9')
            return 0;
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936
        offset = ((str[1] - '0') * 10 + (str[2] - '0')) * 60;
        offset += (str[3] - '0') * 10 + (str[4] - '0');
        if (*str == '-')
            offset = -offset;
    }
    atm.type = ctm->type;
    atm.flags = 0;
    atm.length = sizeof(buff2);
    atm.data = (unsigned char *)buff2;

    if (X509_time_adj(&atm, offset * 60, cmp_time) == NULL)
        return 0;

    if (ctm->type == V_ASN1_UTCTIME) {
        i = (buff1[0] - '0') * 10 + (buff1[1] - '0');
        if (i < 50)
            i += 100;           /* cf. RFC 2459 */
        j = (buff2[0] - '0') * 10 + (buff2[1] - '0');
        if (j < 50)
            j += 100;

        if (i < j)
            return -1;
        if (i > j)
            return 1;
    }
    i = strcmp(buff1, buff2);
    if (i == 0)                 /* wait a second then return younger :-) */
        return -1;
    else
        return i;
}
1937

1938
ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
D
Dr. Stephen Henson 已提交
1939
{
1940
    return X509_time_adj(s, adj, NULL);
D
Dr. Stephen Henson 已提交
1941 1942
}

1943
ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1944 1945 1946
{
    return X509_time_adj_ex(s, 0, offset_sec, in_tm);
}
1947 1948

ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
                            int offset_day, long offset_sec, time_t *in_tm)
{
    time_t t;

    if (in_tm)
        t = *in_tm;
    else
        time(&t);

    if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING)) {
        if (s->type == V_ASN1_UTCTIME)
            return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
        if (s->type == V_ASN1_GENERALIZEDTIME)
            return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
    }
    return ASN1_TIME_adj(s, t, offset_day, offset_sec);
}
1966

B
Ben Laurie 已提交
1967
int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
{
    EVP_PKEY *ktmp = NULL, *ktmp2;
    int i, j;

    if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey))
        return 1;

    for (i = 0; i < sk_X509_num(chain); i++) {
        ktmp = X509_get_pubkey(sk_X509_value(chain, i));
        if (ktmp == NULL) {
            X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,
                    X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
            return 0;
        }
        if (!EVP_PKEY_missing_parameters(ktmp))
            break;
R
Rich Salz 已提交
1984 1985
        EVP_PKEY_free(ktmp);
        ktmp = NULL;
1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
    }
    if (ktmp == NULL) {
        X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,
                X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
        return 0;
    }

    /* first, populate the other certs */
    for (j = i - 1; j >= 0; j--) {
        ktmp2 = X509_get_pubkey(sk_X509_value(chain, j));
        EVP_PKEY_copy_parameters(ktmp2, ktmp);
        EVP_PKEY_free(ktmp2);
    }

    if (pkey != NULL)
        EVP_PKEY_copy_parameters(pkey, ktmp);
    EVP_PKEY_free(ktmp);
    return 1;
}
2005

2006 2007 2008
/* Make a delta CRL as the diff between two full CRLs */

X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer,
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050
                        EVP_PKEY *skey, const EVP_MD *md, unsigned int flags)
{
    X509_CRL *crl = NULL;
    int i;
    STACK_OF(X509_REVOKED) *revs = NULL;
    /* CRLs can't be delta already */
    if (base->base_crl_number || newer->base_crl_number) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA);
        return NULL;
    }
    /* Base and new CRL must have a CRL number */
    if (!base->crl_number || !newer->crl_number) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER);
        return NULL;
    }
    /* Issuer names must match */
    if (X509_NAME_cmp(X509_CRL_get_issuer(base), X509_CRL_get_issuer(newer))) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH);
        return NULL;
    }
    /* AKID and IDP must match */
    if (!crl_extension_match(base, newer, NID_authority_key_identifier)) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH);
        return NULL;
    }
    if (!crl_extension_match(base, newer, NID_issuing_distribution_point)) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH);
        return NULL;
    }
    /* Newer CRL number must exceed full CRL number */
    if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER);
        return NULL;
    }
    /* CRLs must verify */
    if (skey && (X509_CRL_verify(base, skey) <= 0 ||
                 X509_CRL_verify(newer, skey) <= 0)) {
        X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE);
        return NULL;
    }
    /* Create new CRL */
    crl = X509_CRL_new();
2051
    if (crl == NULL || !X509_CRL_set_version(crl, 1))
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
        goto memerr;
    /* Set issuer name */
    if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer)))
        goto memerr;

    if (!X509_CRL_set_lastUpdate(crl, X509_CRL_get_lastUpdate(newer)))
        goto memerr;
    if (!X509_CRL_set_nextUpdate(crl, X509_CRL_get_nextUpdate(newer)))
        goto memerr;

    /* Set base CRL number: must be critical */

    if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0))
        goto memerr;

    /*
     * Copy extensions across from newest CRL to delta: this will set CRL
     * number to correct value too.
     */

    for (i = 0; i < X509_CRL_get_ext_count(newer); i++) {
        X509_EXTENSION *ext;
        ext = X509_CRL_get_ext(newer, i);
        if (!X509_CRL_add_ext(crl, ext, -1))
            goto memerr;
    }

    /* Go through revoked entries, copying as needed */

    revs = X509_CRL_get_REVOKED(newer);

    for (i = 0; i < sk_X509_REVOKED_num(revs); i++) {
        X509_REVOKED *rvn, *rvtmp;
        rvn = sk_X509_REVOKED_value(revs, i);
        /*
         * Add only if not also in base. TODO: need something cleverer here
         * for some more complex CRLs covering multiple CAs.
         */
2090
        if (!X509_CRL_get0_by_serial(base, &rvtmp, &rvn->serialNumber)) {
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
            rvtmp = X509_REVOKED_dup(rvn);
            if (!rvtmp)
                goto memerr;
            if (!X509_CRL_add0_revoked(crl, rvtmp)) {
                X509_REVOKED_free(rvtmp);
                goto memerr;
            }
        }
    }
    /* TODO: optionally prune deleted entries */

    if (skey && md && !X509_CRL_sign(crl, skey, md))
        goto memerr;

    return crl;

 memerr:
    X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE);
R
Rich Salz 已提交
2109
    X509_CRL_free(crl);
2110 2111 2112
    return NULL;
}

U
Ulf Möller 已提交
2113
int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
2114 2115 2116
{
    return CRYPTO_set_ex_data(&ctx->ex_data, idx, data);
}
2117

U
Ulf Möller 已提交
2118
void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
2119 2120 2121
{
    return CRYPTO_get_ex_data(&ctx->ex_data, idx);
}
2122

U
Ulf Möller 已提交
2123
int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
2124 2125 2126
{
    return ctx->error;
}
2127

U
Ulf Möller 已提交
2128
void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
2129 2130 2131
{
    ctx->error = err;
}
2132

U
Ulf Möller 已提交
2133
int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
2134 2135 2136
{
    return ctx->error_depth;
}
2137

U
Ulf Möller 已提交
2138
X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
2139 2140 2141
{
    return ctx->current_cert;
}
2142

B
Ben Laurie 已提交
2143
STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
2144 2145 2146
{
    return ctx->chain;
}
2147

2148
STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
2149 2150 2151 2152 2153
{
    if (!ctx->chain)
        return NULL;
    return X509_chain_up_ref(ctx->chain);
}
2154

2155
X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2156 2157 2158
{
    return ctx->current_issuer;
}
2159 2160

X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2161 2162 2163
{
    return ctx->current_crl;
}
2164 2165

X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2166 2167 2168
{
    return ctx->parent;
}
2169

U
Ulf Möller 已提交
2170
void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2171 2172 2173
{
    ctx->cert = x;
}
2174

U
Ulf Möller 已提交
2175
void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2176 2177 2178
{
    ctx->untrusted = sk;
}
2179

2180
void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2181 2182 2183
{
    ctx->crls = sk;
}
2184

2185
int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2186 2187 2188
{
    return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
}
2189

2190
int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203
{
    return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
}

/*
 * This function is used to set the X509_STORE_CTX purpose and trust values.
 * This is intended to be used when another structure has its own trust and
 * purpose values which (if set) will be inherited by the ctx. If they aren't
 * set then we will usually have a default purpose in mind which should then
 * be used to set the trust value. An example of this is SSL use: an SSL
 * structure will have its own purpose and trust settings which the
 * application can set: if they aren't set then we use the default of SSL
 * client/server.
2204 2205 2206
 */

int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249
                                   int purpose, int trust)
{
    int idx;
    /* If purpose not set use default */
    if (!purpose)
        purpose = def_purpose;
    /* If we have a purpose then check it is valid */
    if (purpose) {
        X509_PURPOSE *ptmp;
        idx = X509_PURPOSE_get_by_id(purpose);
        if (idx == -1) {
            X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
                    X509_R_UNKNOWN_PURPOSE_ID);
            return 0;
        }
        ptmp = X509_PURPOSE_get0(idx);
        if (ptmp->trust == X509_TRUST_DEFAULT) {
            idx = X509_PURPOSE_get_by_id(def_purpose);
            if (idx == -1) {
                X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
                        X509_R_UNKNOWN_PURPOSE_ID);
                return 0;
            }
            ptmp = X509_PURPOSE_get0(idx);
        }
        /* If trust not set then get from purpose default */
        if (!trust)
            trust = ptmp->trust;
    }
    if (trust) {
        idx = X509_TRUST_get_by_id(trust);
        if (idx == -1) {
            X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
                    X509_R_UNKNOWN_TRUST_ID);
            return 0;
        }
    }

    if (purpose && !ctx->param->purpose)
        ctx->param->purpose = purpose;
    if (trust && !ctx->param->trust)
        ctx->param->trust = trust;
    return 1;
2250 2251
}

2252 2253
X509_STORE_CTX *X509_STORE_CTX_new(void)
{
R
Rich Salz 已提交
2254
    X509_STORE_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
R
Rich Salz 已提交
2255

2256
    if (ctx == NULL) {
2257 2258 2259 2260
        X509err(X509_F_X509_STORE_CTX_NEW, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    return ctx;
2261 2262 2263 2264
}

void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
{
R
Rich Salz 已提交
2265 2266
    if (!ctx)
        return;
2267 2268
    X509_STORE_CTX_cleanup(ctx);
    OPENSSL_free(ctx);
2269 2270
}

2271
int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2272 2273 2274
                        STACK_OF(X509) *chain)
{
    int ret = 1;
2275

2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
    ctx->ctx = store;
    ctx->current_method = 0;
    ctx->cert = x509;
    ctx->untrusted = chain;
    ctx->crls = NULL;
    ctx->last_untrusted = 0;
    ctx->other_ctx = NULL;
    ctx->valid = 0;
    ctx->chain = NULL;
    ctx->error = 0;
    ctx->explicit_policy = 0;
    ctx->error_depth = 0;
    ctx->current_cert = NULL;
    ctx->current_issuer = NULL;
    ctx->current_crl = NULL;
    ctx->current_crl_score = 0;
    ctx->current_reasons = 0;
    ctx->tree = NULL;
    ctx->parent = NULL;

    if (store) {
        ctx->verify_cb = store->verify_cb;
        ctx->cleanup = store->cleanup;
    } else
        ctx->cleanup = 0;

    if (store && store->check_issued)
        ctx->check_issued = store->check_issued;
    else
        ctx->check_issued = check_issued;

    if (store && store->get_issuer)
        ctx->get_issuer = store->get_issuer;
    else
        ctx->get_issuer = X509_STORE_CTX_get1_issuer;

    if (store && store->verify_cb)
        ctx->verify_cb = store->verify_cb;
    else
        ctx->verify_cb = null_callback;

    if (store && store->verify)
        ctx->verify = store->verify;
    else
        ctx->verify = internal_verify;

    if (store && store->check_revocation)
        ctx->check_revocation = store->check_revocation;
    else
        ctx->check_revocation = check_revocation;

    if (store && store->get_crl)
        ctx->get_crl = store->get_crl;
    else
        ctx->get_crl = NULL;

    if (store && store->check_crl)
        ctx->check_crl = store->check_crl;
    else
        ctx->check_crl = check_crl;

    if (store && store->cert_crl)
        ctx->cert_crl = store->cert_crl;
    else
        ctx->cert_crl = cert_crl;

    if (store && store->lookup_certs)
        ctx->lookup_certs = store->lookup_certs;
    else
        ctx->lookup_certs = X509_STORE_get1_certs;

    if (store && store->lookup_crls)
        ctx->lookup_crls = store->lookup_crls;
    else
        ctx->lookup_crls = X509_STORE_get1_crls;

    ctx->check_policy = check_policy;

2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380
    /*
    *   For ctx->cleanup running well in X509_STORE_CTX_cleanup ,
    *   initial all ctx before exceptional handling.
    */
    ctx->param = X509_VERIFY_PARAM_new();
    if (ctx->param == NULL) {
        X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    /*
     * Inherit callbacks and flags from X509_STORE if not set use defaults.
     */
    if (store)
        ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
    else
        ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT | X509_VP_FLAG_ONCE;

    if (ret)
        ret = X509_VERIFY_PARAM_inherit(ctx->param,
                                        X509_VERIFY_PARAM_lookup("default"));

    if (ret == 0) {
        X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE);
        goto err;
    }

2381
    /*
2382 2383
     * Since X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we
     * put a corresponding "new" here.
2384 2385 2386 2387
     */
    if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
                            &(ctx->ex_data))) {
        X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE);
2388
        goto err;
2389 2390
    }
    return 1;
2391 2392 2393 2394

err:
    X509_STORE_CTX_cleanup(ctx);
    return 0;
2395 2396 2397 2398 2399
}

/*
 * Set alternative lookup method: just a STACK of trusted certificates. This
 * avoids X509_STORE nastiness where it isn't needed.
2400 2401 2402 2403
 */

void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
{
2404 2405
    ctx->other_ctx = sk;
    ctx->get_issuer = get_issuer_sk;
2406 2407 2408
}

void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2409 2410 2411 2412 2413 2414 2415 2416
{
    if (ctx->cleanup)
        ctx->cleanup(ctx);
    if (ctx->param != NULL) {
        if (ctx->parent == NULL)
            X509_VERIFY_PARAM_free(ctx->param);
        ctx->param = NULL;
    }
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2417 2418 2419 2420
    X509_policy_tree_free(ctx->tree);
    ctx->tree = NULL;
    sk_X509_pop_free(ctx->chain, X509_free);
    ctx->chain = NULL;
2421
    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2422
    memset(&ctx->ex_data, 0, sizeof(ctx->ex_data));
2423
}
2424

2425
void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2426 2427 2428
{
    X509_VERIFY_PARAM_set_depth(ctx->param, depth);
}
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Dr. Stephen Henson 已提交
2429

2430
void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2431 2432 2433
{
    X509_VERIFY_PARAM_set_flags(ctx->param, flags);
}
2434

2435 2436 2437 2438 2439
void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags,
                             time_t t)
{
    X509_VERIFY_PARAM_set_time(ctx->param, t);
}
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Dr. Stephen Henson 已提交
2440

L
Lutz Jänicke 已提交
2441
void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2442 2443 2444 2445
                                  int (*verify_cb) (int, X509_STORE_CTX *))
{
    ctx->verify_cb = verify_cb;
}
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Lutz Jänicke 已提交
2446

2447
X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2448 2449 2450
{
    return ctx->tree;
}
2451 2452

int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2453 2454 2455
{
    return ctx->explicit_policy;
}
2456

2457 2458 2459 2460 2461
int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx)
{
    return ctx->last_untrusted;
}

2462
int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2463 2464 2465 2466 2467 2468 2469
{
    const X509_VERIFY_PARAM *param;
    param = X509_VERIFY_PARAM_lookup(name);
    if (!param)
        return 0;
    return X509_VERIFY_PARAM_inherit(ctx->param, param);
}
2470 2471

X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2472 2473 2474
{
    return ctx->param;
}
2475 2476

void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2477
{
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Rich Salz 已提交
2478
    X509_VERIFY_PARAM_free(ctx->param);
2479 2480
    ctx->param = param;
}