diff options
Diffstat (limited to 'crypto/x509/x509_vfy.c')
| -rw-r--r-- | crypto/x509/x509_vfy.c | 146 |
1 files changed, 133 insertions, 13 deletions
diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c index 3bad523f7114..f0fa7f4f07b4 100644 --- a/crypto/x509/x509_vfy.c +++ b/crypto/x509/x509_vfy.c @@ -160,6 +160,7 @@ int X509_verify_cert(X509_STORE_CTX *ctx) STACK_OF(X509) *sktmp = NULL; if (ctx->cert == NULL) { X509err(X509_F_X509_VERIFY_CERT, X509_R_NO_CERT_SET_FOR_US_TO_VERIFY); + ctx->error = X509_V_ERR_INVALID_CALL; return -1; } if (ctx->chain != NULL) { @@ -168,6 +169,7 @@ int X509_verify_cert(X509_STORE_CTX *ctx) * cannot do another one. */ X509err(X509_F_X509_VERIFY_CERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); + ctx->error = X509_V_ERR_INVALID_CALL; return -1; } @@ -180,6 +182,8 @@ int X509_verify_cert(X509_STORE_CTX *ctx) 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); + ctx->error = X509_V_ERR_OUT_OF_MEM; + ok = -1; goto end; } CRYPTO_add(&ctx->cert->references, 1, CRYPTO_LOCK_X509); @@ -189,6 +193,8 @@ int X509_verify_cert(X509_STORE_CTX *ctx) if (ctx->untrusted != NULL && (sktmp = sk_X509_dup(ctx->untrusted)) == NULL) { X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE); + ctx->error = X509_V_ERR_OUT_OF_MEM; + ok = -1; goto end; } @@ -214,6 +220,8 @@ int X509_verify_cert(X509_STORE_CTX *ctx) if (xtmp != NULL) { if (!sk_X509_push(ctx->chain, xtmp)) { X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE); + ctx->error = X509_V_ERR_OUT_OF_MEM; + ok = -1; goto end; } CRYPTO_add(&xtmp->references, 1, CRYPTO_LOCK_X509); @@ -293,15 +301,19 @@ int X509_verify_cert(X509_STORE_CTX *ctx) if (ctx->check_issued(ctx, x, x)) break; ok = ctx->get_issuer(&xtmp, ctx, x); - if (ok < 0) - return ok; + if (ok < 0) { + ctx->error = X509_V_ERR_STORE_LOOKUP; + goto end; + } 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; + ctx->error = X509_V_ERR_OUT_OF_MEM; + ok = -1; + goto end; } num++; } @@ -317,8 +329,10 @@ int X509_verify_cert(X509_STORE_CTX *ctx) while (j-- > 1) { xtmp2 = sk_X509_value(ctx->chain, j - 1); ok = ctx->get_issuer(&xtmp, ctx, xtmp2); - if (ok < 0) + if (ok < 0) { + ctx->error = X509_V_ERR_STORE_LOOKUP; goto end; + } /* Check if we found an alternate chain */ if (ok > 0) { /* @@ -432,6 +446,10 @@ int X509_verify_cert(X509_STORE_CTX *ctx) sk_X509_free(sktmp); if (chain_ss != NULL) X509_free(chain_ss); + + /* Safety net, error returns must set ctx->error */ + if (ok <= 0 && ctx->error == X509_V_OK) + ctx->error = X509_V_ERR_UNSPECIFIED; return ok; } @@ -615,13 +633,27 @@ static int check_chain_extensions(X509_STORE_CTX *ctx) * 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; + /* + * RFC3820, 4.1.3 (b)(1) stipulates that if pCPathLengthConstraint + * is less than max_path_length, the former should be copied to + * the latter, and 4.1.4 (a) stipulates that max_path_length + * should be verified to be larger than zero and decrement it. + * + * Because we're checking the certs in the reverse order, we start + * with verifying that proxy_path_length isn't larger than pcPLC, + * and copy the latter to the former if it is, and finally, + * increment proxy_path_length. + */ + if (x->ex_pcpathlen != -1) { + if (proxy_path_length > 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 = x->ex_pcpathlen; } proxy_path_length++; must_be_ca = 0; @@ -644,6 +676,81 @@ static int check_name_constraints(X509_STORE_CTX *ctx) /* Ignore self issued certs unless last in chain */ if (i && (x->ex_flags & EXFLAG_SI)) continue; + + /* + * Proxy certificates policy has an extra constraint, where the + * certificate subject MUST be the issuer with a single CN entry + * added. + * (RFC 3820: 3.4, 4.1.3 (a)(4)) + */ + if (x->ex_flags & EXFLAG_PROXY) { + X509_NAME *tmpsubject = X509_get_subject_name(x); + X509_NAME *tmpissuer = X509_get_issuer_name(x); + X509_NAME_ENTRY *tmpentry = NULL; + int last_object_nid = 0; + int err = X509_V_OK; + int last_object_loc = X509_NAME_entry_count(tmpsubject) - 1; + + /* Check that there are at least two RDNs */ + if (last_object_loc < 1) { + err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; + goto proxy_name_done; + } + + /* + * Check that there is exactly one more RDN in subject as + * there is in issuer. + */ + if (X509_NAME_entry_count(tmpsubject) + != X509_NAME_entry_count(tmpissuer) + 1) { + err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; + goto proxy_name_done; + } + + /* + * Check that the last subject component isn't part of a + * multivalued RDN + */ + if (X509_NAME_get_entry(tmpsubject, last_object_loc)->set + == X509_NAME_get_entry(tmpsubject, last_object_loc - 1)->set) { + err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; + goto proxy_name_done; + } + + /* + * Check that the last subject RDN is a commonName, and that + * all the previous RDNs match the issuer exactly + */ + tmpsubject = X509_NAME_dup(tmpsubject); + if (tmpsubject == NULL) { + X509err(X509_F_CHECK_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE); + ctx->error = X509_V_ERR_OUT_OF_MEM; + return 0; + } + + tmpentry = + X509_NAME_delete_entry(tmpsubject, last_object_loc); + last_object_nid = + OBJ_obj2nid(X509_NAME_ENTRY_get_object(tmpentry)); + + if (last_object_nid != NID_commonName + || X509_NAME_cmp(tmpsubject, tmpissuer) != 0) { + err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; + } + + X509_NAME_ENTRY_free(tmpentry); + X509_NAME_free(tmpsubject); + + proxy_name_done: + if (err != X509_V_OK) { + ctx->error = err; + ctx->error_depth = i; + ctx->current_cert = x; + if (!ctx->verify_cb(0, ctx)) + return 0; + } + } + /* * Check against constraints for all certificates higher in chain * including trust anchor. Trust anchor not strictly speaking needed @@ -654,12 +761,19 @@ static int check_name_constraints(X509_STORE_CTX *ctx) NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc; if (nc) { rv = NAME_CONSTRAINTS_check(x, nc); - if (rv != X509_V_OK) { + switch (rv) { + case X509_V_OK: + continue; + case X509_V_ERR_OUT_OF_MEM: + ctx->error = rv; + return 0; + default: ctx->error = rv; ctx->error_depth = i; ctx->current_cert = x; if (!ctx->verify_cb(0, ctx)) return 0; + break; } } } @@ -1469,6 +1583,7 @@ static int check_policy(X509_STORE_CTX *ctx) ctx->param->policies, ctx->param->flags); if (ret == 0) { X509err(X509_F_CHECK_POLICY, ERR_R_MALLOC_FAILURE); + ctx->error = X509_V_ERR_OUT_OF_MEM; return 0; } /* Invalid or inconsistent extensions */ @@ -1497,7 +1612,12 @@ static int check_policy(X509_STORE_CTX *ctx) if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY) { ctx->current_cert = NULL; - ctx->error = X509_V_OK; + /* + * Verification errors need to be "sticky", a callback may have allowed + * an SSL handshake to continue despite an error, and we must then + * remain in an error state. Therefore, we MUST NOT clear earlier + * verification errors by setting the error to X509_V_OK. + */ if (!ctx->verify_cb(2, ctx)) return 0; } |