diff options
Diffstat (limited to 'openssl/crypto/x509/x509_vfy.c')
| -rw-r--r-- | openssl/crypto/x509/x509_vfy.c | 2219 |
1 files changed, 2219 insertions, 0 deletions
diff --git a/openssl/crypto/x509/x509_vfy.c b/openssl/crypto/x509/x509_vfy.c new file mode 100644 index 00000000..5a0b0249 --- /dev/null +++ b/openssl/crypto/x509/x509_vfy.c @@ -0,0 +1,2219 @@ +/* crypto/x509/x509_vfy.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * 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. + * + * 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). + * + * 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. + * + * 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 :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * 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. + * + * 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> + +#include "cryptlib.h" +#include <openssl/crypto.h> +#include <openssl/lhash.h> +#include <openssl/buffer.h> +#include <openssl/evp.h> +#include <openssl/asn1.h> +#include <openssl/x509.h> +#include <openssl/x509v3.h> +#include <openssl/objects.h> + +/* CRL score values */ + +/* No unhandled critical extensions */ + +#define CRL_SCORE_NOCRITICAL 0x100 + +/* certificate is within CRL scope */ + +#define CRL_SCORE_SCOPE 0x080 + +/* CRL times valid */ + +#define CRL_SCORE_TIME 0x040 + +/* Issuer name matches certificate */ + +#define CRL_SCORE_ISSUER_NAME 0x020 + +/* 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 */ + +#define CRL_SCORE_ISSUER_CERT 0x018 + +/* CRL issuer is on certificate path */ + +#define CRL_SCORE_SAME_PATH 0x008 + +/* CRL issuer matches CRL AKID */ + +#define CRL_SCORE_AKID 0x004 + +/* Have a delta CRL with valid times */ + +#define CRL_SCORE_TIME_DELTA 0x002 + +static int null_callback(int ok,X509_STORE_CTX *e); +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); +static int check_chain_extensions(X509_STORE_CTX *ctx); +static int check_name_constraints(X509_STORE_CTX *ctx); +static int check_trust(X509_STORE_CTX *ctx); +static int check_revocation(X509_STORE_CTX *ctx); +static int check_cert(X509_STORE_CTX *ctx); +static int check_policy(X509_STORE_CTX *ctx); + +static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer, + unsigned int *preasons, + X509_CRL *crl, X509 *x); +static int get_crl_delta(X509_STORE_CTX *ctx, + 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); +static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score, + unsigned int *preasons); +static int check_crl_path(X509_STORE_CTX *ctx, X509 *x); +static int check_crl_chain(X509_STORE_CTX *ctx, + STACK_OF(X509) *cert_path, + STACK_OF(X509) *crl_path); + +static int internal_verify(X509_STORE_CTX *ctx); +const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT; + + +static int null_callback(int ok, X509_STORE_CTX *e) + { + return ok; + } + +#if 0 +static int x509_subject_cmp(X509 **a, X509 **b) + { + return X509_subject_name_cmp(*a,*b); + } +#endif + +int X509_verify_cert(X509_STORE_CTX *ctx) + { + X509 *x,*xtmp,*chain_ss=NULL; + X509_NAME *xn; + int bad_chain = 0; + X509_VERIFY_PARAM *param = ctx->param; + int depth,i,ok=0; + int num; + 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; + } + + 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 */ + if (ctx->chain == NULL) + { + 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; + } + CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509); + ctx->last_untrusted=1; + } + + /* 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 */ + xn=X509_get_issuer_name(x); + if (ctx->check_issued(ctx, x,x)) 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; + } + CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509); + (void)sk_X509_delete_ptr(sktmp,xtmp); + ctx->last_untrusted++; + x=xtmp; + num++; + /* reparse the full chain for + * the next one */ + continue; + } + } + break; + } + + /* 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. */ + + /* 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); + xn = X509_get_subject_name(x); + if (ctx->check_issued(ctx, x, 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; + } + } + else + { + /* extract and save self signed certificate for later use */ + chain_ss=sk_X509_pop(ctx->chain); + ctx->last_untrusted--; + num--; + x=sk_X509_value(ctx->chain,num-1); + } + } + + /* 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 */ + xn=X509_get_issuer_name(x); + if (ctx->check_issued(ctx,x,x)) break; + + ok = ctx->get_issuer(&xtmp, ctx, x); + + if (ok < 0) return ok; + 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); + return 0; + } + num++; + } + + /* we now have our chain, lets check it... */ + xn=X509_get_issuer_name(x); + + /* Is last certificate looked up self signed? */ + if (!ctx->check_issued(ctx,x,x)) + { + 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; + + /* The chain extensions are OK: check trust */ + + if (param->trust > 0) ok = check_trust(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; + + /* 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; + +#ifndef OPENSSL_NO_RFC3779 + /* 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; +#endif + + /* If we get this far evaluate policies */ + if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK)) + ok = ctx->check_policy(ctx); + if(!ok) goto end; + if (0) + { +end: + X509_get_pubkey_parameters(NULL,ctx->chain); + } + if (sktmp != NULL) sk_X509_free(sktmp); + if (chain_ss != NULL) X509_free(chain_ss); + return ok; + } + + +/* Given a STACK_OF(X509) find the issuer of cert (if any) + */ + +static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x) +{ + int i; + X509 *issuer; + for (i = 0; i < sk_X509_num(sk); i++) + { + issuer = sk_X509_value(sk, i); + if (ctx->check_issued(ctx, x, issuer)) + return issuer; + } + return NULL; +} + +/* Given a possible certificate and issuer check them */ + +static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer) +{ + int ret; + ret = X509_check_issued(issuer, x); + 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); + return 0; +} + +/* Alternative lookup method: look from a STACK stored in other_ctx */ + +static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x) +{ + *issuer = find_issuer(ctx, ctx->other_ctx, x); + if (*issuer) + { + CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509); + return 1; + } + else + return 0; +} + + +/* Check a certificate chains extensions for consistency + * with the supplied purpose + */ + +static int check_chain_extensions(X509_STORE_CTX *ctx) +{ +#ifdef OPENSSL_NO_CHAIN_VERIFY + return 1; +#else + 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; + + /* 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. + */ + 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; + end: + return ok; +#endif +} + +static int check_name_constraints(X509_STORE_CTX *ctx) + { + 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; + } + +static int check_trust(X509_STORE_CTX *ctx) +{ +#ifdef OPENSSL_NO_CHAIN_VERIFY + return 1; +#else + int i, ok; + X509 *x; + int (*cb)(int xok,X509_STORE_CTX *xctx); + cb=ctx->verify_cb; +/* For now just check the last certificate in the chain */ + i = sk_X509_num(ctx->chain) - 1; + x = sk_X509_value(ctx->chain, i); + ok = X509_check_trust(x, ctx->param->trust, 0); + if (ok == X509_TRUST_TRUSTED) + return 1; + ctx->error_depth = i; + ctx->current_cert = x; + if (ok == X509_TRUST_REJECTED) + ctx->error = X509_V_ERR_CERT_REJECTED; + else + ctx->error = X509_V_ERR_CERT_UNTRUSTED; + ok = cb(0, ctx); + return ok; +#endif +} + +static int check_revocation(X509_STORE_CTX *ctx) + { + int i, last, ok; + 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; + } + +static int check_cert(X509_STORE_CTX *ctx) + { + X509_CRL *crl = NULL, *dcrl = NULL; + X509 *x; + int ok, cnum; + 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) + { + /* 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; + } + err: + X509_CRL_free(crl); + X509_CRL_free(dcrl); + + ctx->current_crl = NULL; + return ok; + + } + +/* Check CRL times against values in X509_STORE_CTX */ + +static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify) + { + 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; + 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; + } + +static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl, + 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) + { + if (*pcrl) + X509_CRL_free(*pcrl); + *pcrl = best_crl; + *pissuer = best_crl_issuer; + *pscore = best_score; + *preasons = best_reasons; + CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL); + if (*pdcrl) + { + X509_CRL_free(*pdcrl); + *pdcrl = NULL; + } + 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 + * 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) + { + ASN1_OCTET_STRING *exta, *extb; + int i; + i = X509_CRL_get_ext_by_NID(a, nid, 0); + 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; + + i = X509_CRL_get_ext_by_NID(b, nid, 0); + + if (i >= 0) + { + + 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; + + if (!exta && !extb) + return 1; + + if (!exta || !extb) + return 0; + + + if (ASN1_OCTET_STRING_cmp(exta, extb)) + return 0; + + return 1; + } + +/* See if a base and delta are compatible */ + +static int check_delta_base(X509_CRL *delta, X509_CRL *base) + { + /* 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... + */ + +static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore, + 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; + CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL); + *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. + */ + +static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer, + 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; + + } + +static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl, + 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 + * X509_STORE_CTX and populates it with most of the parameters from the + * 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. + */ + +static int check_crl_path(X509_STORE_CTX *ctx, X509 *x) + { + 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 + */ + +static int check_crl_chain(X509_STORE_CTX *ctx, + 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; + } + +/* Check for match between two dist point names: three separate cases. + * 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. + * 4. One is NULL: automatic match. + */ + + +static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b) + { + 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; + + } + +static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score) + { + 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; + } + +/* Check CRLDP and IDP */ + +static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score, + 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 + */ + +static int get_crl_delta(X509_STORE_CTX *ctx, + 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; + } + +/* Check CRL validity */ +static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl) + { + 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 + { + /* 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; + } + +/* Check certificate against CRL */ +static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x) + { + 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 (crl->flags & EXFLAG_CRITICAL) + { + if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL) + return 1; + 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; + } + +static int check_policy(X509_STORE_CTX *ctx) + { + 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; + } + +static int check_cert_time(X509_STORE_CTX *ctx, X509 *x) + { + time_t *ptime; + int i; + + if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME) + ptime = &ctx->param->check_time; + else + ptime = NULL; + + i=X509_cmp_time(X509_get_notBefore(x), ptime); + if (i == 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) + { + 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) + { + 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) + { + ctx->error=X509_V_ERR_CERT_HAS_EXPIRED; + ctx->current_cert=x; + if (!ctx->verify_cb(0, ctx)) + return 0; + } + + return 1; + } + +static int internal_verify(X509_STORE_CTX *ctx) + { + 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 (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; + + ok = check_cert_time(ctx, xs); + 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; + } + +int X509_cmp_current_time(const ASN1_TIME *ctm) +{ + return X509_cmp_time(ctm, NULL); +} + +int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time) + { + char *str; + ASN1_TIME atm; + long offset; + char buff1[24],buff2[24],*p; + int i,j; + + p=buff1; + i=ctm->length; + str=(char *)ctm->data; + if (ctm->type == V_ASN1_UTCTIME) + { + if ((i < 11) || (i > 17)) return 0; + memcpy(p,str,10); + p+=10; + str+=10; + } + else + { + if (i < 13) return 0; + memcpy(p,str,12); + p+=12; + str+=12; + } + + if ((*str == 'Z') || (*str == '-') || (*str == '+')) + { *(p++)='0'; *(p++)='0'; } + else + { + *(p++)= *(str++); + *(p++)= *(str++); + /* Skip any fractional seconds... */ + if (*str == '.') + { + str++; + while ((*str >= '0') && (*str <= '9')) str++; + } + + } + *(p++)='Z'; + *(p++)='\0'; + + if (*str == 'Z') + offset=0; + else + { + if ((*str != '+') && (*str != '-')) + return 0; + 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; + } + +ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj) +{ + return X509_time_adj(s, adj, NULL); +} + +ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm) + { + return X509_time_adj_ex(s, 0, offset_sec, in_tm); + } + +ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s, + 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); + } + +int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain) + { + 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; + else + { + EVP_PKEY_free(ktmp); + ktmp=NULL; + } + } + 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; + } + +int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, + CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) + { + /* This function is (usually) called only once, by + * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */ + return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp, + new_func, dup_func, free_func); + } + +int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data) + { + return CRYPTO_set_ex_data(&ctx->ex_data,idx,data); + } + +void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx) + { + return CRYPTO_get_ex_data(&ctx->ex_data,idx); + } + +int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx) + { + return ctx->error; + } + +void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err) + { + ctx->error=err; + } + +int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx) + { + return ctx->error_depth; + } + +X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx) + { + return ctx->current_cert; + } + +STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx) + { + return ctx->chain; + } + +STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx) + { + int i; + X509 *x; + STACK_OF(X509) *chain; + if (!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL; + for (i = 0; i < sk_X509_num(chain); i++) + { + x = sk_X509_value(chain, i); + CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); + } + return chain; + } + +X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx) + { + return ctx->current_issuer; + } + +X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx) + { + return ctx->current_crl; + } + +X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx) + { + return ctx->parent; + } + +void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x) + { + ctx->cert=x; + } + +void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk) + { + ctx->untrusted=sk; + } + +void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk) + { + ctx->crls=sk; + } + +int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose) + { + return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0); + } + +int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust) + { + 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. + */ + +int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose, + 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; +} + +X509_STORE_CTX *X509_STORE_CTX_new(void) +{ + X509_STORE_CTX *ctx; + ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX)); + if (!ctx) + { + X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE); + return NULL; + } + memset(ctx, 0, sizeof(X509_STORE_CTX)); + return ctx; +} + +void X509_STORE_CTX_free(X509_STORE_CTX *ctx) +{ + X509_STORE_CTX_cleanup(ctx); + OPENSSL_free(ctx); +} + +int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509, + STACK_OF(X509) *chain) + { + int ret = 1; + 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; + + ctx->param = X509_VERIFY_PARAM_new(); + + if (!ctx->param) + { + X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE); + return 0; + } + + /* 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 (store) + { + ctx->verify_cb = store->verify_cb; + ctx->cleanup = store->cleanup; + } + else + ctx->cleanup = 0; + + 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); + return 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; + + + /* This memset() can't make any sense anyway, so it's removed. As + * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a + * corresponding "new" here and remove this bogus initialisation. */ + /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */ + if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, + &(ctx->ex_data))) + { + OPENSSL_free(ctx); + X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE); + return 0; + } + return 1; + } + +/* Set alternative lookup method: just a STACK of trusted certificates. + * This avoids X509_STORE nastiness where it isn't needed. + */ + +void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk) +{ + ctx->other_ctx = sk; + ctx->get_issuer = get_issuer_sk; +} + +void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx) + { + if (ctx->cleanup) ctx->cleanup(ctx); + if (ctx->param != NULL) + { + if (ctx->parent == NULL) + X509_VERIFY_PARAM_free(ctx->param); + ctx->param=NULL; + } + if (ctx->tree != NULL) + { + X509_policy_tree_free(ctx->tree); + ctx->tree=NULL; + } + if (ctx->chain != NULL) + { + sk_X509_pop_free(ctx->chain,X509_free); + ctx->chain=NULL; + } + CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data)); + memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA)); + } + +void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth) + { + X509_VERIFY_PARAM_set_depth(ctx->param, depth); + } + +void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags) + { + X509_VERIFY_PARAM_set_flags(ctx->param, flags); + } + +void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t) + { + X509_VERIFY_PARAM_set_time(ctx->param, t); + } + +void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx, + int (*verify_cb)(int, X509_STORE_CTX *)) + { + ctx->verify_cb=verify_cb; + } + +X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx) + { + return ctx->tree; + } + +int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx) + { + return ctx->explicit_policy; + } + +int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name) + { + const X509_VERIFY_PARAM *param; + param = X509_VERIFY_PARAM_lookup(name); + if (!param) + return 0; + return X509_VERIFY_PARAM_inherit(ctx->param, param); + } + +X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx) + { + return ctx->param; + } + +void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param) + { + if (ctx->param) + X509_VERIFY_PARAM_free(ctx->param); + ctx->param = param; + } + +IMPLEMENT_STACK_OF(X509) +IMPLEMENT_ASN1_SET_OF(X509) + +IMPLEMENT_STACK_OF(X509_NAME) + +IMPLEMENT_STACK_OF(X509_ATTRIBUTE) +IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE) |