/* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */ /* Written by Vern Staats for the OpenSSL project 2000. */ /* ==================================================================== * Copyright (c) 2000 The OpenSSL Project. All rights reserved. * * 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 above 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 acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED 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 OpenSSL PROJECT OR * ITS 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. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ /* ssl/kssl.c -- Routines to support (& debug) Kerberos5 auth for openssl ** ** 19990701 VRS Started. ** 200011?? Jeffrey Altman, Richard Levitte ** Generalized for Heimdal, Newer MIT, & Win32. ** Integrated into main OpenSSL 0.9.7 snapshots. ** 20010413 Simon Wilkinson, VRS ** Real RFC2712 KerberosWrapper replaces AP_REQ. */ #include #ifndef OPENSSL_NO_KRB5 #include #define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */ #include #include #include #include #include /* * When OpenSSL is built on Windows, we do not want to require that * the Kerberos DLLs be available in order for the OpenSSL DLLs to * work. Therefore, all Kerberos routines are loaded at run time * and we do not link to a .LIB file. */ #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) /* * The purpose of the following pre-processor statements is to provide * compatibility with different releases of MIT Kerberos for Windows. * All versions up to 1.2 used macros. But macros do not allow for * a binary compatible interface for DLLs. Therefore, all macros are * being replaced by function calls. The following code will allow * an OpenSSL DLL built on Windows to work whether or not the macro * or function form of the routines are utilized. */ #ifdef krb5_cc_get_principal #define NO_DEF_KRB5_CCACHE #undef krb5_cc_get_principal #endif #define krb5_cc_get_principal kssl_krb5_cc_get_principal #define krb5_free_data_contents kssl_krb5_free_data_contents #define krb5_free_context kssl_krb5_free_context #define krb5_auth_con_free kssl_krb5_auth_con_free #define krb5_free_principal kssl_krb5_free_principal #define krb5_mk_req_extended kssl_krb5_mk_req_extended #define krb5_get_credentials kssl_krb5_get_credentials #define krb5_cc_default kssl_krb5_cc_default #define krb5_sname_to_principal kssl_krb5_sname_to_principal #define krb5_init_context kssl_krb5_init_context #define krb5_free_ticket kssl_krb5_free_ticket #define krb5_rd_req kssl_krb5_rd_req #define krb5_kt_default kssl_krb5_kt_default #define krb5_kt_resolve kssl_krb5_kt_resolve #define krb5_auth_con_init kssl_krb5_auth_con_init #define krb5_principal_compare kssl_krb5_principal_compare /* macro #define krb5_kt_get_entry kssl_krb5_kt_get_entry */ #define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part #define krb5_timeofday kssl_krb5_timeofday #define krb5_rc_default kssl_krb5_rc_default #define krb5_krb5_rc_initialize kssl_krb5_rc_initialize #define krb5_krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan #define krb5_krb5_rc_destroy kssl_krb5_rc_destroy /* Prototypes for built in stubs */ void kssl_krb5_free_data_contents(krb5_context, krb5_data *); void kssl_krb5_free_principal(krb5_context, krb5_principal ); krb5_error_code kssl_krb5_kt_resolve(krb5_context, krb5_const char *, krb5_keytab *); krb5_error_code kssl_krb5_kt_default(krb5_context, krb5_keytab *); krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *); krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, krb5_const krb5_data *, krb5_const_principal, krb5_keytab, krb5_flags *,krb5_ticket **); krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal, krb5_const_principal); krb5_error_code krb5_decrypt_tkt_part(krb5_context, krb5_const krb5_keyblock *, krb5_ticket *); krb5_error_code krb5_timeofday(krb5_context context, krb5_int32 *timeret); krb5_error_code krb5_rc_default(krb5_context context, krb5_rcache *rc); krb5_error_code krb5_rc_initialize(krb5_context context, krb5_rcache rc, krb5_deltat lifespan); krb5_error_code krb5_rc_get_lifespan(krb5_context context, krb5_rcache rc, krb5_deltat *lifespan); krb5_error_code krb5_rc_destroy(krb5_context context, krb5_rcache rc); krb5_error_code kssl_krb5_mk_req_extended(krb5_context, krb5_auth_context *, krb5_const krb5_flags, krb5_data *, krb5_creds *, krb5_data * ); krb5_error_code kssl_krb5_init_context(krb5_context *); void kssl_krb5_free_context(krb5_context); krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache *); krb5_error_code kssl_krb5_sname_to_principal(krb5_context, krb5_const char *, krb5_const char *, krb5_int32, krb5_principal *); krb5_error_code kssl_krb5_get_credentials(krb5_context, krb5_const krb5_flags, krb5_ccache, krb5_creds *, krb5_creds * *); krb5_error_code kssl_krb5_auth_con_init(krb5_context, krb5_auth_context *); krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, krb5_ccache cache, krb5_principal *principal); krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context); /* Function pointers (almost all Kerberos functions are _stdcall) */ static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *) =NULL; static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal ) =NULL; static krb5_error_code(_stdcall *p_krb5_kt_resolve) (krb5_context, krb5_const char *, krb5_keytab *)=NULL; static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context, krb5_keytab *)=NULL; static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context, krb5_ticket *)=NULL; static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context, krb5_auth_context *, krb5_const krb5_data *, krb5_const_principal, krb5_keytab, krb5_flags *, krb5_ticket **)=NULL; static krb5_error_code (_stdcall *p_krb5_mk_req_extended) (krb5_context, krb5_auth_context *, krb5_const krb5_flags, krb5_data *, krb5_creds *, krb5_data * )=NULL; static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL; static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL; static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context, krb5_ccache *)=NULL; static krb5_error_code (_stdcall *p_krb5_sname_to_principal) (krb5_context, krb5_const char *, krb5_const char *, krb5_int32, krb5_principal *)=NULL; static krb5_error_code (_stdcall *p_krb5_get_credentials) (krb5_context, krb5_const krb5_flags, krb5_ccache, krb5_creds *, krb5_creds **)=NULL; static krb5_error_code (_stdcall *p_krb5_auth_con_init) (krb5_context, krb5_auth_context *)=NULL; static krb5_error_code (_stdcall *p_krb5_cc_get_principal) (krb5_context context, krb5_ccache cache, krb5_principal *principal)=NULL; static krb5_error_code (_stdcall *p_krb5_auth_con_free) (krb5_context, krb5_auth_context)=NULL; static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */ /* Function to Load the Kerberos 5 DLL and initialize function pointers */ void load_krb5_dll(void) { HANDLE hKRB5_32; krb5_loaded++; hKRB5_32 = LoadLibrary("KRB5_32"); if (!hKRB5_32) return; (FARPROC) p_krb5_free_data_contents = GetProcAddress( hKRB5_32, "krb5_free_data_contents" ); (FARPROC) p_krb5_free_context = GetProcAddress( hKRB5_32, "krb5_free_context" ); (FARPROC) p_krb5_auth_con_free = GetProcAddress( hKRB5_32, "krb5_auth_con_free" ); (FARPROC) p_krb5_free_principal = GetProcAddress( hKRB5_32, "krb5_free_principal" ); (FARPROC) p_krb5_mk_req_extended = GetProcAddress( hKRB5_32, "krb5_mk_req_extended" ); (FARPROC) p_krb5_get_credentials = GetProcAddress( hKRB5_32, "krb5_get_credentials" ); (FARPROC) p_krb5_cc_get_principal = GetProcAddress( hKRB5_32, "krb5_cc_get_principal" ); (FARPROC) p_krb5_cc_default = GetProcAddress( hKRB5_32, "krb5_cc_default" ); (FARPROC) p_krb5_sname_to_principal = GetProcAddress( hKRB5_32, "krb5_sname_to_principal" ); (FARPROC) p_krb5_init_context = GetProcAddress( hKRB5_32, "krb5_init_context" ); (FARPROC) p_krb5_free_ticket = GetProcAddress( hKRB5_32, "krb5_free_ticket" ); (FARPROC) p_krb5_rd_req = GetProcAddress( hKRB5_32, "krb5_rd_req" ); (FARPROC) p_krb5_principal_compare = GetProcAddress( hKRB5_32, "krb5_principal_compare" ); (FARPROC) p_krb5_decrypt_tkt_part = GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" ); (FARPROC) p_krb5_timeofday = GetProcAddress( hKRB5_32, "krb5_timeofday" ); (FARPROC) p_krb5_rc_default = GetProcAddress( hKRB5_32, "krb5_rc_default" ); (FARPROC) p_krb5_rc_initialize = GetProcAddress( hKRB5_32, "krb5_rc_initialize" ); (FARPROC) p_krb5_rc_get_lifespan = GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" ); (FARPROC) p_krb5_rc_destroy = GetProcAddress( hKRB5_32, "krb5_rc_destroy" ); (FARPROC) p_krb5_kt_default = GetProcAddress( hKRB5_32, "krb5_kt_default" ); (FARPROC) p_krb5_kt_resolve = GetProcAddress( hKRB5_32, "krb5_kt_resolve" ); (FARPROC) p_krb5_auth_con_init = GetProcAddress( hKRB5_32, "krb5_auth_con_init" ); } /* Stubs for each function to be dynamicly loaded */ void kssl_krb5_free_data_contents(krb5_context CO, krb5_data * data) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_free_data_contents ) p_krb5_free_data_contents(CO,data); } krb5_error_code kssl_krb5_mk_req_extended (krb5_context CO, krb5_auth_context * pACO, krb5_const krb5_flags F, krb5_data * pD1, krb5_creds * pC, krb5_data * pD2) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_mk_req_extended ) return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_auth_con_init(krb5_context CO, krb5_auth_context * pACO) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_auth_con_init ) return(p_krb5_auth_con_init(CO,pACO)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_auth_con_free (krb5_context CO, krb5_auth_context ACO) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_auth_con_free ) return(p_krb5_auth_con_free(CO,ACO)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_get_credentials(krb5_context CO, krb5_const krb5_flags F, krb5_ccache CC, krb5_creds * pCR, krb5_creds ** ppCR) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_get_credentials ) return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_sname_to_principal(krb5_context CO, krb5_const char * pC1, krb5_const char * pC2, krb5_int32 I, krb5_principal * pPR) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_sname_to_principal ) return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_cc_default(krb5_context CO, krb5_ccache * pCC) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_cc_default ) return(p_krb5_cc_default(CO,pCC)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_init_context(krb5_context * pCO) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_init_context ) return(p_krb5_init_context(pCO)); else return KRB5KRB_ERR_GENERIC; } void kssl_krb5_free_context(krb5_context CO) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_free_context ) p_krb5_free_context(CO); } void kssl_krb5_free_principal(krb5_context c, krb5_principal p) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_free_principal ) p_krb5_free_principal(c,p); } krb5_error_code kssl_krb5_kt_resolve(krb5_context con, krb5_const char * sz, krb5_keytab * kt) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_kt_resolve ) return(p_krb5_kt_resolve(con,sz,kt)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_kt_default(krb5_context con, krb5_keytab * kt) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_kt_default ) return(p_krb5_kt_default(con,kt)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_free_ticket(krb5_context con, krb5_ticket * kt) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_free_ticket ) return(p_krb5_free_ticket(con,kt)); else return KRB5KRB_ERR_GENERIC; } krb5_error_code kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon, krb5_const krb5_data * data, krb5_const_principal princ, krb5_keytab keytab, krb5_flags * flags, krb5_ticket ** pptkt) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_rd_req ) return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt)); else return KRB5KRB_ERR_GENERIC; } krb5_boolean krb5_principal_compare(krb5_context con, krb5_const_principal princ1, krb5_const_principal princ2) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_principal_compare ) return(p_krb5_principal_compare(con,princ1,princ2); else return KRB5KRB_ERR_GENERIC; } krb5_error_code krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys, krb5_ticket *ticket) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_decrypt_tkt_part ) return(p_krb5_decrypt_tkt_part(con,keys,ticket); else return KRB5KRB_ERR_GENERIC; } krb5_error_code krb5_timeofday(krb5_context con, krb5_int32 *timeret) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_timeofday ) return(p_krb5_timeofday(con,timeret); else return KRB5KRB_ERR_GENERIC; } krb5_error_code krb5_rc_default(krb5_context con, krb5_rcache *rc) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_rc_default ) return(p_krb5_rc_default(con,rc); else return KRB5KRB_ERR_GENERIC; } krb5_error_code krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_rc_initialize ) return(p_krb5_rc_initialize(con, rc, lifespan); else return KRB5KRB_ERR_GENERIC; } krb5_error_code krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_rc_get_lifespan ) return(p_krb5_rc_get_lifespan(con, rc, lifespanp); else return KRB5KRB_ERR_GENERIC; } krb5_error_code krb5_rc_destroy(krb5_context con, krb5_rcache rc) { if (!krb5_loaded) load_krb5_dll(); if ( p_krb5_rc_destroy ) return(p_krb5_rc_destroy(con, rc); else return KRB5KRB_ERR_GENERIC; } /* Structure definitions */ #ifndef NO_DEF_KRB5_CCACHE #ifndef krb5_x #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1)) #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0)) #endif typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */ typedef struct _krb5_ccache { krb5_magic magic; struct _krb5_cc_ops FAR *ops; krb5_pointer data; } *krb5_ccache; typedef struct _krb5_cc_ops { krb5_magic magic; char *prefix; char * (KRB5_CALLCONV *get_name) KRB5_NPROTOTYPE((krb5_context, krb5_ccache)); krb5_error_code (KRB5_CALLCONV *resolve) KRB5_NPROTOTYPE((krb5_context, krb5_ccache *, const char *)); krb5_error_code (KRB5_CALLCONV *gen_new) KRB5_NPROTOTYPE((krb5_context, krb5_ccache *)); krb5_error_code (KRB5_CALLCONV *init) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_principal)); krb5_error_code (KRB5_CALLCONV *destroy) KRB5_NPROTOTYPE((krb5_context, krb5_ccache)); krb5_error_code (KRB5_CALLCONV *close) KRB5_NPROTOTYPE((krb5_context, krb5_ccache)); krb5_error_code (KRB5_CALLCONV *store) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_creds *)); krb5_error_code (KRB5_CALLCONV *retrieve) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_flags, krb5_creds *, krb5_creds *)); krb5_error_code (KRB5_CALLCONV *get_princ) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_principal *)); krb5_error_code (KRB5_CALLCONV *get_first) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_cc_cursor *)); krb5_error_code (KRB5_CALLCONV *get_next) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_cc_cursor *, krb5_creds *)); krb5_error_code (KRB5_CALLCONV *end_get) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_cc_cursor *)); krb5_error_code (KRB5_CALLCONV *remove_cred) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_flags, krb5_creds *)); krb5_error_code (KRB5_CALLCONV *set_flags) KRB5_NPROTOTYPE((krb5_context, krb5_ccache, krb5_flags)); } krb5_cc_ops; #endif /* NO_DEF_KRB5_CCACHE */ krb5_error_code kssl_krb5_cc_get_principal (krb5_context context, krb5_ccache cache, krb5_principal *principal) { if ( p_krb5_cc_get_principal ) return(p_krb5_cc_get_principal(context,cache,principal)); else return(krb5_x ((cache)->ops->get_princ,(context, cache, principal))); } #else #endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */ char *kstring(char *string) { static char *null = "[NULL]"; return ((string == NULL)? null: string); } #define MAXKNUM 255 char *knumber(int len, krb5_octet *contents) { static char buf[MAXKNUM+1]; int i; BIO_snprintf(buf, MAXKNUM, "[%d] ", len); for (i=0; i < len && MAXKNUM > strlen(buf)+3; i++) { BIO_snprintf(&buf[strlen(buf)], 3, "%02x", contents[i]); } return (buf); } /* Given KRB5 enctype (basically DES or 3DES), return */ EVP_CIPHER * kssl_map_enc(krb5_enctype enctype) { switch (enctype) { case ENCTYPE_DES_CBC_CRC: case ENCTYPE_DES_CBC_MD4: case ENCTYPE_DES_CBC_MD5: case ENCTYPE_DES_CBC_RAW: #if ! defined(KRB5_MIT_OLD11) case ENCTYPE_DES_HMAC_SHA1: #endif return (EVP_CIPHER *) EVP_des_cbc(); break; case ENCTYPE_DES3_CBC_SHA: case ENCTYPE_DES3_CBC_RAW: #if ! defined(KRB5_MIT_OLD11) case ENCTYPE_DES3_CBC_SHA1: #endif return (EVP_CIPHER *) EVP_des_ede3_cbc(); break; default: return (EVP_CIPHER *) NULL; break; } } /* Return true:1 if p "looks like" the start of the real authenticator ** described in kssl_skip_confound() below. The ASN.1 pattern is ** "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and ** xx and yy are possibly multi-byte length fields. */ int kssl_test_confound(unsigned char *p) { int len = 2; int xx = 0, yy = 0; if (*p++ != 0x62) return 0; if (*p > 0x82) return 0; switch(*p) { case 0x82: p++; xx = (*p++ << 8); xx += *p++; break; case 0x81: p++; xx = *p++; break; case 0x80: return 0; default: xx = *p++; break; } if (*p++ != 0x30) return 0; if (*p > 0x82) return 0; switch(*p) { case 0x82: p++; len+=2; yy = (*p++ << 8); yy += *p++; break; case 0x81: p++; len++; yy = *p++; break; case 0x80: return 0; default: yy = *p++; break; } return (xx - len == yy)? 1: 0; } /* Allocate, fill, and return cksumlens array of checksum lengths. ** This array holds just the unique elements from the krb5_cksumarray[]. ** array[n] == 0 signals end of data. */ int *populate_cksumlens(void) { int i, j, n = krb5_max_cksum+1; static int *cklens = NULL; #ifdef KRB5CHECKAUTH if (!cklens && !(cklens = (int *) calloc(sizeof(int), n))) return NULL; for (i=0; i < krb5_max_cksum; i++) { if (!krb5_cksumarray[i]) continue; /* array has holes */ for (j=0; j < krb5_max_cksum; j++) { if (cklens[j] == 0) { cklens[j] = krb5_cksumarray[i]->checksum_length; break; /* krb5 elem was new: add */ } if (cklens[j] == krb5_cksumarray[i]->checksum_length) { break; /* ignore duplicate elements */ } } } #endif /* KRB5CHECKAUTH */ return cklens; } /* Return pointer to start of real authenticator within authenticator, or ** return NULL on error. ** Decrypted authenticator looks like this: ** [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r] ** This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the ** krb5_auth_con_getcksumtype() function advertised in its krb5.h. */ unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a) { int i, cklen, conlen; static int *cksumlens = NULL; unsigned char *test_auth; conlen = (etype)? 8: 0; if (!cksumlens && !(cksumlens = populate_cksumlens())) return NULL; for (i=0; (cklen = cksumlens[i]) != 0; i++) { test_auth = a + conlen + cklen; if (kssl_test_confound(test_auth)) return test_auth; } return NULL; } /* Set kssl_err error info when reason text is a simple string ** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; } */ void kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text) { if (kssl_err == NULL) return; kssl_err->reason = reason; BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text); return; } /* Display contents of krb5_data struct, for debugging */ void print_krb5_data(char *label, krb5_data *kdata) { int i; printf("%s[%d] ", label, kdata->length); for (i=0; i < kdata->length; i++) { if (0 && isprint((int) kdata->data[i])) printf( "%c ", kdata->data[i]); else printf( "%02x ", (unsigned char) kdata->data[i]); } printf("\n"); } /* Display contents of krb5_authdata struct, for debugging */ void print_krb5_authdata(char *label, krb5_authdata **adata) { if (adata == NULL) { printf("%s, authdata==0\n", label); return; } printf("%s [%p]\n", label, adata); #if 0 { int i; printf("%s[at%d:%d] ", label, adata->ad_type, adata->length); for (i=0; i < adata->length; i++) { printf((isprint(adata->contents[i]))? "%c ": "%02x", adata->contents[i]); } printf("\n"); } #endif } /* Display contents of krb5_keyblock struct, for debugging */ void print_krb5_keyblock(char *label, krb5_keyblock *keyblk) { int i; if (keyblk == NULL) { printf("%s, keyblk==0\n", label); return; } #ifdef KRB5_HEIMDAL printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype, keyblk->keyvalue->length); for (i=0; i < keyblk->keyvalue->length; i++) { printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]); } printf("\n"); #else printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length); for (i=0; i < keyblk->length; i++) { printf("%02x",keyblk->contents[i]); } printf("\n"); #endif } /* Display contents of krb5_principal_data struct, for debugging ** (krb5_principal is typedef'd == krb5_principal_data *) */ void print_krb5_princ(char *label, krb5_principal_data *princ) { int i, j; printf("%s principal Realm: ", label); if (princ == NULL) return; for (i=0; i < princ->realm.length; i++) putchar(princ->realm.data[i]); printf(" (nametype %d) has %d strings:\n", princ->type,princ->length); for (i=0; i < princ->length; i++) { printf("\t%d [%d]: ", i, princ->data[i].length); for (j=0; j < princ->data[i].length; j++) { putchar(princ->data[i].data[j]); } printf("\n"); } return; } /* Given krb5 service (typically "kssl") and hostname in kssl_ctx, ** Return encrypted Kerberos ticket for service @ hostname. ** If authenp is non-NULL, also return encrypted authenticator, ** whose data should be freed by caller. ** (Originally was: Create Kerberos AP_REQ message for SSL Client.) ** ** 19990628 VRS Started; Returns Kerberos AP_REQ message. ** 20010409 VRS Modified for RFC2712; Returns enc tkt. ** 20010606 VRS May also return optional authenticator. */ krb5_error_code kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, /* OUT */ krb5_data **enc_ticketp, /* UPDATE */ krb5_data *authenp, /* OUT */ KSSL_ERR *kssl_err) { krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; krb5_context krb5context = NULL; krb5_auth_context krb5auth_context = NULL; krb5_ccache krb5ccdef = NULL; krb5_creds krb5creds, *krb5credsp = NULL; krb5_data krb5_app_req; kssl_err_set(kssl_err, 0, ""); memset((char *)&krb5creds, 0, sizeof(krb5creds)); if (!kssl_ctx) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n"); goto err; } else if (!kssl_ctx->service_host) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "kssl_ctx service_host undefined.\n"); goto err; } if ((krb5rc = krb5_init_context(&krb5context)) != 0) { BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, "krb5_init_context() fails: %d\n", krb5rc); kssl_err->reason = SSL_R_KRB5_C_INIT; goto err; } if ((krb5rc = krb5_sname_to_principal(krb5context, kssl_ctx->service_host, (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, KRB5_NT_SRV_HST, &krb5creds.server)) != 0) { BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, "krb5_sname_to_principal() fails for %s/%s\n", kssl_ctx->service_host, (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC); kssl_err->reason = SSL_R_KRB5_C_INIT; goto err; } if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) { kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, "krb5_cc_default fails.\n"); goto err; } if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, &krb5creds.client)) != 0) { kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, "krb5_cc_get_principal() fails.\n"); goto err; } if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, &krb5creds, &krb5credsp)) != 0) { kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED, "krb5_get_credentials() fails.\n"); goto err; } *enc_ticketp = &krb5credsp->ticket; #ifdef KRB5_HEIMDAL kssl_ctx->enctype = krb5credsp->session.keytype; #else kssl_ctx->enctype = krb5credsp->keyblock.enctype; #endif krb5rc = KRB5KRB_ERR_GENERIC; /* caller should free data of krb5_app_req */ /* 20010406 VRS deleted for real KerberosWrapper ** 20010605 VRS reinstated to offer Authenticator to KerberosWrapper */ krb5_app_req.length = 0; if (authenp) { krb5_data krb5in_data; unsigned char *p; long arlen; KRB5_APREQBODY *ap_req; authenp->length = 0; krb5in_data.data = NULL; krb5in_data.length = 0; if ((krb5rc = krb5_mk_req_extended(krb5context, &krb5auth_context, 0, &krb5in_data, krb5credsp, &krb5_app_req)) != 0) { kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ, "krb5_mk_req_extended() fails.\n"); goto err; } arlen = krb5_app_req.length; p = krb5_app_req.data; ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen); if (ap_req) { authenp->length = i2d_KRB5_ENCDATA( ap_req->authenticator, NULL); if (authenp->length && (authenp->data = malloc(authenp->length))) { unsigned char *p = authenp->data; authenp->length = i2d_KRB5_ENCDATA( ap_req->authenticator, &p); } } if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req); if (krb5_app_req.length) krb5_xfree(krb5_app_req.data); } #ifdef KRB5_HEIMDAL if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) { kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, "kssl_ctx_setkey() fails.\n"); } #else if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) { kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, "kssl_ctx_setkey() fails.\n"); } #endif else krb5rc = 0; err: #ifdef KSSL_DEBUG kssl_ctx_show(kssl_ctx); #endif /* KSSL_DEBUG */ if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client); if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server); if (krb5auth_context) krb5_auth_con_free(krb5context, krb5auth_context); if (krb5context) krb5_free_context(krb5context); return (krb5rc); } /* Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket. ** Return Kerberos error code and kssl_err struct on error. ** Allocates krb5_ticket and krb5_principal; caller should free these. ** ** 20010410 VRS Implemented krb5_decode_ticket() as ** old_krb5_decode_ticket(). Missing from MIT1.0.6. ** 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions. ** Re-used some of the old krb5_decode_ticket() ** code here. This tkt should alloc/free just ** like the real thing. */ krb5_error_code kssl_TKT2tkt( /* IN */ krb5_context krb5context, /* IN */ KRB5_TKTBODY *asn1ticket, /* OUT */ krb5_ticket **krb5ticket, /* OUT */ KSSL_ERR *kssl_err ) { krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; krb5_ticket *new5ticket = NULL; ASN1_GENERALSTRING *gstr_svc, *gstr_host; *krb5ticket = NULL; if (asn1ticket == NULL || asn1ticket->realm == NULL || asn1ticket->sname == NULL || asn1ticket->sname->namestring == NULL || asn1ticket->sname->namestring->num < 2) { BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "Null field in asn1ticket.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; return KRB5KRB_ERR_GENERIC; } if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL) { BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "Unable to allocate new krb5_ticket.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */ } gstr_svc = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[0]; gstr_host = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[1]; if ((krb5rc = kssl_build_principal_2(krb5context, &new5ticket->server, asn1ticket->realm->length, asn1ticket->realm->data, gstr_svc->length, gstr_svc->data, gstr_host->length, gstr_host->data)) != 0) { free(new5ticket); BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "Error building ticket server principal.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; return krb5rc; /* or KRB5KRB_ERR_GENERIC; */ } krb5_princ_type(krb5context, new5ticket->server) = asn1ticket->sname->nametype->data[0]; new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0]; new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0]; new5ticket->enc_part.ciphertext.length = asn1ticket->encdata->cipher->length; if ((new5ticket->enc_part.ciphertext.data = calloc(1, asn1ticket->encdata->cipher->length)) == NULL) { free(new5ticket); BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "Error allocating cipher in krb5ticket.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; return KRB5KRB_ERR_GENERIC; } else { memcpy(new5ticket->enc_part.ciphertext.data, asn1ticket->encdata->cipher->data, asn1ticket->encdata->cipher->length); } *krb5ticket = new5ticket; return 0; } /* Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"), ** and krb5 AP_REQ message & message length, ** Return Kerberos session key and client principle ** to SSL Server in KSSL_CTX *kssl_ctx. ** ** 19990702 VRS Started. */ krb5_error_code kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, /* IN */ krb5_data *indata, /* OUT */ krb5_ticket_times *ttimes, /* OUT */ KSSL_ERR *kssl_err ) { krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; static krb5_context krb5context = NULL; static krb5_auth_context krb5auth_context = NULL; krb5_ticket *krb5ticket = NULL; KRB5_TKTBODY *asn1ticket = NULL; unsigned char *p; krb5_keytab krb5keytab = NULL; krb5_keytab_entry kt_entry; krb5_principal krb5server; kssl_err_set(kssl_err, 0, ""); if (!kssl_ctx) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n"); goto err; } #ifdef KSSL_DEBUG printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name)); #endif /* KSSL_DEBUG */ if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_init_context() fails.\n"); goto err; } if (krb5auth_context && (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_auth_con_free() fails.\n"); goto err; } else krb5auth_context = NULL; if (!krb5auth_context && (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_auth_con_init() fails.\n"); goto err; } if ((krb5rc = krb5_sname_to_principal(krb5context, NULL, (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, KRB5_NT_SRV_HST, &krb5server)) != 0) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_sname_to_principal() fails.\n"); goto err; } /* kssl_ctx->keytab_file == NULL ==> use Kerberos default */ if (kssl_ctx->keytab_file) { krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, &krb5keytab); if (krb5rc) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_kt_resolve() fails.\n"); goto err; } } else { krb5rc = krb5_kt_default(krb5context,&krb5keytab); if (krb5rc) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_kt_default() fails.\n"); goto err; } } /* Actual Kerberos5 krb5_recvauth() has initial conversation here ** o check KRB5_SENDAUTH_BADAUTHVERS ** unless KRB5_RECVAUTH_SKIP_VERSION ** o check KRB5_SENDAUTH_BADAPPLVERS ** o send "0" msg if all OK */ /* 20010411 was using AP_REQ instead of true KerberosWrapper ** ** if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, ** &krb5in_data, krb5server, krb5keytab, ** &ap_option, &krb5ticket)) != 0) { Error } */ p = indata->data; if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p, (long) indata->length)) == NULL) { BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "d2i_KRB5_TICKET() ASN.1 decode failure.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; goto err; } /* Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */ if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket, kssl_err)) != 0) { BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "Error converting ASN.1 ticket to krb5_ticket.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; goto err; } if (! krb5_principal_compare(krb5context, krb5server, krb5ticket->server)) { krb5rc = KRB5_PRINC_NOMATCH; BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "server principal != ticket principal\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; goto err; } if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, krb5ticket->server, krb5ticket->enc_part.kvno, krb5ticket->enc_part.enctype, &kt_entry)) != 0) { BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "krb5_kt_get_entry() fails with %x.\n", krb5rc); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; goto err; } if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key, krb5ticket)) != 0) { BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "krb5_decrypt_tkt_part() failed.\n"); kssl_err->reason = SSL_R_KRB5_S_RD_REQ; goto err; } else { krb5_kt_free_entry(krb5context, &kt_entry); #ifdef KSSL_DEBUG { int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs; printf("Decrypted ticket fields:\n"); printf("\tflags: %X, transit-type: %X", krb5ticket->enc_part2->flags, krb5ticket->enc_part2->transited.tr_type); print_krb5_data("\ttransit-data: ", &(krb5ticket->enc_part2->transited.tr_contents)); printf("\tcaddrs: %p, authdata: %p\n", krb5ticket->enc_part2->caddrs, krb5ticket->enc_part2->authorization_data); printf("\tcaddrs:\n"); for (i=0; paddr[i] != NULL; i++) { krb5_data d; d.length=paddr[i]->length; d.data=paddr[i]->contents; print_krb5_data("\t\tIP: ", &d); } printf("\tstart/auth/end times: %d / %d / %d\n", krb5ticket->enc_part2->times.starttime, krb5ticket->enc_part2->times.authtime, krb5ticket->enc_part2->times.endtime); } #endif /* KSSL_DEBUG */ } krb5rc = KRB5_NO_TKT_SUPPLIED; if (!krb5ticket || !krb5ticket->enc_part2 || !krb5ticket->enc_part2->client || !krb5ticket->enc_part2->client->data || !krb5ticket->enc_part2->session) { kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, "bad ticket from krb5_rd_req.\n"); } else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT, &krb5ticket->enc_part2->client->realm, krb5ticket->enc_part2->client->data)) { kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, "kssl_ctx_setprinc() fails.\n"); } else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) { kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, "kssl_ctx_setkey() fails.\n"); } else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) { krb5rc = KRB5KRB_AP_ERR_TKT_INVALID; kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, "invalid ticket from krb5_rd_req.\n"); } else krb5rc = 0; kssl_ctx->enctype = krb5ticket->enc_part.enctype; ttimes->authtime = krb5ticket->enc_part2->times.authtime; ttimes->starttime = krb5ticket->enc_part2->times.starttime; ttimes->endtime = krb5ticket->enc_part2->times.endtime; ttimes->renew_till = krb5ticket->enc_part2->times.renew_till; err: #ifdef KSSL_DEBUG kssl_ctx_show(kssl_ctx); #endif /* KSSL_DEBUG */ if (asn1ticket) KRB5_TICKET_free((KRB5_TICKET *) asn1ticket); if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); if (krb5ticket) krb5_free_ticket(krb5context, krb5ticket); if (krb5server) krb5_free_principal(krb5context, krb5server); return (krb5rc); } /* Allocate & return a new kssl_ctx struct. */ KSSL_CTX * kssl_ctx_new(void) { return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX))); } /* Frees a kssl_ctx struct and any allocated memory it holds. ** Returns NULL. */ KSSL_CTX * kssl_ctx_free(KSSL_CTX *kssl_ctx) { if (kssl_ctx == NULL) return kssl_ctx; if (kssl_ctx->key) memset(kssl_ctx->key, 0, kssl_ctx->length); if (kssl_ctx->key) free(kssl_ctx->key); if (kssl_ctx->client_princ) free(kssl_ctx->client_princ); if (kssl_ctx->service_host) free(kssl_ctx->service_host); if (kssl_ctx->service_name) free(kssl_ctx->service_name); if (kssl_ctx->keytab_file) free(kssl_ctx->keytab_file); free(kssl_ctx); return (KSSL_CTX *) NULL; } /* Given a (krb5_data *) entity (and optional realm), ** set the plain (char *) client_princ or service_host member ** of the kssl_ctx struct. */ krb5_error_code kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which, krb5_data *realm, krb5_data *entity) { char **princ; int length; if (kssl_ctx == NULL || entity == NULL) return KSSL_CTX_ERR; switch (which) { case KSSL_CLIENT: princ = &kssl_ctx->client_princ; break; case KSSL_SERVER: princ = &kssl_ctx->service_host; break; default: return KSSL_CTX_ERR; break; } if (*princ) free(*princ); length = entity->length + ((realm)? realm->length + 2: 1); if ((*princ = calloc(1, length)) == NULL) return KSSL_CTX_ERR; else { strncpy(*princ, entity->data, entity->length); if (realm) { strcat (*princ, "@"); (void) strncat(*princ, realm->data, realm->length); } } return KSSL_CTX_OK; } /* Set one of the plain (char *) string members of the kssl_ctx struct. ** Default values should be: ** which == KSSL_SERVICE => "khost" (KRB5SVC) ** which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB) */ krb5_error_code kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text) { char **string; if (!kssl_ctx) return KSSL_CTX_ERR; switch (which) { case KSSL_SERVICE: string = &kssl_ctx->service_name; break; case KSSL_SERVER: string = &kssl_ctx->service_host; break; case KSSL_CLIENT: string = &kssl_ctx->client_princ; break; case KSSL_KEYTAB: string = &kssl_ctx->keytab_file; break; default: return KSSL_CTX_ERR; break; } if (*string) free(*string); if (!text) { *string = '\0'; return KSSL_CTX_OK; } if ((*string = calloc(1, strlen(text) + 1)) == NULL) return KSSL_CTX_ERR; else strcpy(*string, text); return KSSL_CTX_OK; } /* Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx ** struct. Clear kssl_ctx->key if Kerberos session key is NULL. */ krb5_error_code kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session) { int length; krb5_enctype enctype; krb5_octet FAR *contents = NULL; if (!kssl_ctx) return KSSL_CTX_ERR; if (kssl_ctx->key) { memset(kssl_ctx->key, 0, kssl_ctx->length); free(kssl_ctx->key); } if (session) { #ifdef KRB5_HEIMDAL length = session->keyvalue->length; enctype = session->keytype; contents = session->keyvalue->contents; #else length = session->length; enctype = session->enctype; contents = session->contents; #endif kssl_ctx->enctype = enctype; kssl_ctx->length = length; } else { kssl_ctx->enctype = ENCTYPE_UNKNOWN; kssl_ctx->length = 0; return KSSL_CTX_OK; } if ((kssl_ctx->key = (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL) { kssl_ctx->length = 0; return KSSL_CTX_ERR; } else memcpy(kssl_ctx->key, contents, length); return KSSL_CTX_OK; } /* Display contents of kssl_ctx struct */ void kssl_ctx_show(KSSL_CTX *kssl_ctx) { int i; printf("kssl_ctx: "); if (kssl_ctx == NULL) { printf("NULL\n"); return; } else printf("%p\n", kssl_ctx); printf("\tservice:\t%s\n", (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL"); printf("\tclient:\t%s\n", (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL"); printf("\tserver:\t%s\n", (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL"); printf("\tkeytab:\t%s\n", (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL"); printf("\tkey [%d:%d]:\t", kssl_ctx->enctype, kssl_ctx->length); for (i=0; i < kssl_ctx->length && kssl_ctx->key; i++) { printf("%02x", kssl_ctx->key[i]); } printf("\n"); return; } void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data) { #ifdef KRB5_HEIMDAL data->length = 0; free(data->if (data->data) data); #elif defined(KRB5_MIT_OLD11) if (data->data) { krb5_xfree(data->data); data->data = 0; } #else krb5_free_data_contents(NULL, data); #endif } /* Helper function for kssl_validate_times(). ** We need context->clockskew, but krb5_context is an opaque struct. ** So we try to sneek the clockskew out through the replay cache. ** If that fails just return a likely default (300 seconds). */ krb5_deltat get_rc_clockskew(krb5_context context) { krb5_rcache rc; krb5_deltat clockskew; if (krb5_rc_default(context, &rc)) return KSSL_CLOCKSKEW; if (krb5_rc_initialize(context, rc, 0)) return KSSL_CLOCKSKEW; if (krb5_rc_get_lifespan(context, rc, &clockskew)) { clockskew = KSSL_CLOCKSKEW; } (void) krb5_rc_destroy(context, rc); return clockskew; } /* kssl_validate_times() combines (and more importantly exposes) ** the MIT KRB5 internal function krb5_validate_times() and the ** in_clock_skew() macro. The authenticator client time is checked ** to be within clockskew secs of the current time and the current ** time is checked to be within the ticket start and expire times. ** Either check may be omitted by supplying a NULL value. ** Returns 0 for valid times, SSL_R_KRB5* error codes otherwise. ** See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c ** 20010420 VRS */ krb5_error_code kssl_validate_times( krb5_timestamp atime, krb5_ticket_times *ttimes) { krb5_deltat skew; krb5_timestamp start, now; krb5_error_code rc; krb5_context context; if ((rc = krb5_init_context(&context))) return SSL_R_KRB5_S_BAD_TICKET; skew = get_rc_clockskew(context); if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET; krb5_free_context(context); if (atime && labs(atime - now) >= skew) return SSL_R_KRB5_S_TKT_SKEW; if (! ttimes) return 0; start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime; if (start - now > skew) return SSL_R_KRB5_S_TKT_NYV; if ((now - ttimes->endtime) > skew) return SSL_R_KRB5_S_TKT_EXPIRED; #ifdef KSSL_DEBUG printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n", start, atime, now, skew, ttimes->endtime); #endif /* KSSL_DEBUG */ return 0; } /* Decode and decrypt given DER-encoded authenticator, then pass ** authenticator ctime back in *atimep (or 0 if time unavailable). ** Returns krb5_error_code and kssl_err on error. A NULL ** authenticator (authentp->length == 0) is not considered an error. ** Note that kssl_check_authent() makes use of the KRB5 session key; ** you must call kssl_sget_tkt() to get the key before calling this routine. */ krb5_error_code kssl_check_authent( /* IN */ KSSL_CTX *kssl_ctx, /* IN */ krb5_data *authentp, /* OUT */ krb5_timestamp *atimep, /* OUT */ KSSL_ERR *kssl_err ) { krb5_error_code krb5rc = 0; KRB5_ENCDATA *dec_authent = NULL; KRB5_AUTHENTBODY *auth = NULL; krb5_enctype enctype; EVP_CIPHER_CTX ciph_ctx; EVP_CIPHER *enc = NULL; unsigned char iv[EVP_MAX_IV_LENGTH]; unsigned char *p, *unenc_authent, *tbuf = NULL; int padl, outl, unencbufsize; struct tm tm_time, *tm_l, *tm_g; time_t now, tl, tg, tz_offset; *atimep = 0; kssl_err_set(kssl_err, 0, ""); #ifndef KRB5CHECKAUTH authentp = NULL; #else #if KRB5CHECKAUTH == 0 authentp = NULL; #endif #endif /* KRB5CHECKAUTH */ if (authentp == NULL || authentp->length == 0) return 0; #ifdef KSSL_DEBUG printf("kssl_check_authent: authenticator[%d]:\n",authentp->length); p = authentp->data; for (padl=0; padl < authentp->length; padl++) printf("%02x ",p[padl]); printf("\n"); #endif /* KSSL_DEBUG */ unencbufsize = 2 * authentp->length; if ((unenc_authent = calloc(1, unencbufsize)) == NULL) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "Unable to allocate authenticator buffer.\n"); krb5rc = KRB5KRB_ERR_GENERIC; goto err; } p = authentp->data; if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p, (long) authentp->length)) == NULL) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "Error decoding authenticator.\n"); krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; goto err; } enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */ enc = kssl_map_enc(enctype); memset(iv, 0, EVP_MAX_IV_LENGTH); /* per RFC 1510 */ EVP_DecryptInit(&ciph_ctx, enc, kssl_ctx->key, iv); EVP_DecryptUpdate(&ciph_ctx, unenc_authent, &outl, dec_authent->cipher->data, dec_authent->cipher->length); if (outl > unencbufsize) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "Buffer overflow decrypting authenticator.\n"); krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; goto err; } EVP_DecryptFinal(&ciph_ctx, &(unenc_authent[outl]), &padl); outl += padl; if (outl > unencbufsize) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "Buffer overflow decrypting authenticator.\n"); krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; goto err; } EVP_CIPHER_CTX_cleanup(&ciph_ctx); #ifdef KSSL_DEBUG printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl); for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]); printf("\n"); #endif /* KSSL_DEBUG */ if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "confounded by authenticator.\n"); krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; goto err; } outl -= p - unenc_authent; if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p, (long) outl))==NULL) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "Error decoding authenticator body.\n"); krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; goto err; } if ((tbuf = calloc(1, auth->ctime->length + 1)) == NULL) { kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "Unable to allocate atime buffer.\n"); krb5rc = KRB5KRB_ERR_GENERIC; goto err; } else strncpy(tbuf, auth->ctime->data, auth->ctime->length); if (strptime(tbuf, "%Y%m%d%H%M%S", &tm_time) != NULL) { now = time(&now); tm_l = localtime(&now); tl = mktime(tm_l); tm_g = gmtime(&now); tg = mktime(tm_g); tz_offset = tg - tl; *atimep = mktime(&tm_time) - tz_offset; } #ifdef KSSL_DEBUG printf("kssl_check_authent: client time %s = %d\n", tbuf, *atimep); #endif /* KSSL_DEBUG */ err: if (tbuf) free(tbuf); if (auth) KRB5_AUTHENT_free((KRB5_AUTHENT *) auth); if (dec_authent) KRB5_ENCDATA_free(dec_authent); if (unenc_authent) free(unenc_authent); return krb5rc; } /* Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host), ** because I dont't know how to stub varargs. ** Returns krb5_error_code == ENOMEM on alloc error, otherwise ** passes back newly constructed principal, which should be freed by caller. */ krb5_error_code kssl_build_principal_2( /* UPDATE */ krb5_context context, /* OUT */ krb5_principal *princ, /* IN */ int rlen, const char *realm, /* IN */ int slen, const char *svc, /* IN */ int hlen, const char *host) { krb5_data *p_data = NULL; krb5_principal new_p = NULL; char *new_r = NULL; if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL || (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data))) == NULL) goto err; new_p->length = 2; new_p->data = p_data; if ((new_r = calloc(1, rlen + 1)) == NULL) goto err; memcpy(new_r, realm, rlen); krb5_princ_set_realm_length(context, new_p, rlen); krb5_princ_set_realm_data(context, new_p, new_r); if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) goto err; memcpy(new_p->data[0].data, svc, slen); new_p->data[0].length = slen; if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) goto err; memcpy(new_p->data[1].data, host, hlen); new_p->data[1].length = hlen; krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN; *princ = new_p; return 0; err: if (new_p && new_p[0].data) free(new_p[0].data); if (new_p && new_p[1].data) free(new_p[1].data); if (new_p) free(new_p); if (new_r) free(new_r); return ENOMEM; } #else /* !OPENSSL_NO_KRB5 */ #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS) static int dummy=(int)&dummy; #endif #endif /* !OPENSSL_NO_KRB5 */