/* * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include "internal/cryptlib.h" #include #include #include #include #include "crypto/x509.h" #include "ext_dat.h" static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist); static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values); const X509V3_EXT_METHOD ossl_v3_akey_id = { NID_authority_key_identifier, X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID), 0, 0, 0, 0, 0, 0, (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID, (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID, 0, 0, NULL }; static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist) { char *tmp = NULL; STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist; if (akeyid->keyid) { tmp = OPENSSL_buf2hexstr(akeyid->keyid->data, akeyid->keyid->length); if (tmp == NULL) { ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); return NULL; } if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL, tmp, &extlist)) { OPENSSL_free(tmp); ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB); goto err; } OPENSSL_free(tmp); } if (akeyid->issuer) { tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist); if (tmpextlist == NULL) { ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB); goto err; } extlist = tmpextlist; } if (akeyid->serial) { tmp = OPENSSL_buf2hexstr(akeyid->serial->data, akeyid->serial->length); if (tmp == NULL) { ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); goto err; } if (!X509V3_add_value("serial", tmp, &extlist)) { OPENSSL_free(tmp); goto err; } OPENSSL_free(tmp); } return extlist; err: if (origextlist == NULL) sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free); return NULL; } /*- * Currently two options: * keyid: use the issuers subject keyid, the value 'always' means its is * an error if the issuer certificate doesn't have a key id. * issuer: use the issuers cert issuer and serial number. The default is * to only use this if keyid is not present. With the option 'always' * this is always included. */ static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values) { char keyid = 0, issuer = 0; int i, n = sk_CONF_VALUE_num(values); CONF_VALUE *cnf; ASN1_OCTET_STRING *ikeyid = NULL; X509_NAME *isname = NULL; GENERAL_NAMES *gens = NULL; GENERAL_NAME *gen = NULL; ASN1_INTEGER *serial = NULL; X509_EXTENSION *ext; X509 *issuer_cert; int same_issuer, ss; AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new(); if (akeyid == NULL) goto err; if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) { return akeyid; } for (i = 0; i < n; i++) { cnf = sk_CONF_VALUE_value(values, i); if (strcmp(cnf->name, "keyid") == 0) { keyid = 1; if (cnf->value && strcmp(cnf->value, "always") == 0) keyid = 2; } else if (strcmp(cnf->name, "issuer") == 0) { issuer = 1; if (cnf->value && strcmp(cnf->value, "always") == 0) issuer = 2; } else { ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION, "name=%s", cnf->name); goto err; } } if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0) return akeyid; if (ctx == NULL) { ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER); goto err; } if ((issuer_cert = ctx->issuer_cert) == NULL) { ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE); goto err; } same_issuer = ctx->subject_cert == ctx->issuer_cert; ERR_set_mark(); if (ctx->issuer_pkey != NULL) ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey); else ss = same_issuer; ERR_pop_to_mark(); /* unless forced with "always", AKID is suppressed for self-signed certs */ if (keyid == 2 || (keyid == 1 && !ss)) { /* * prefer any pre-existing subject key identifier of the issuer cert * except issuer cert is same as subject cert and is not self-signed */ i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1); if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL && !(same_issuer && !ss)) ikeyid = X509V3_EXT_d2i(ext); if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) { /* generate fallback AKID, emulating s2i_skey_id(..., "hash") */ X509_PUBKEY *pubkey = NULL; if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey)) ikeyid = ossl_x509_pubkey_hash(pubkey); X509_PUBKEY_free(pubkey); } if ((keyid == 2 || issuer == 0) && (ikeyid == NULL || ASN1_STRING_length(ikeyid) <= 2) /* indicating "none" */) { ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID); goto err; } } if (issuer == 2 || (issuer == 1 && ikeyid == NULL)) { isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert)); serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert)); if (isname == NULL || serial == NULL) { ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS); goto err; } } if (isname != NULL) { if ((gens = sk_GENERAL_NAME_new_null()) == NULL || (gen = GENERAL_NAME_new()) == NULL || !sk_GENERAL_NAME_push(gens, gen)) { ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); goto err; } gen->type = GEN_DIRNAME; gen->d.dirn = isname; } akeyid->issuer = gens; gen = NULL; gens = NULL; akeyid->serial = serial; akeyid->keyid = ikeyid; return akeyid; err: sk_GENERAL_NAME_free(gens); GENERAL_NAME_free(gen); X509_NAME_free(isname); ASN1_INTEGER_free(serial); ASN1_OCTET_STRING_free(ikeyid); AUTHORITY_KEYID_free(akeyid); return NULL; }