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openSUSE:Leap:42.1:Staging:C
wpa_supplicant
0013-rh1178263-CVE-2015-0210-domain_match.patch
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File 0013-rh1178263-CVE-2015-0210-domain_match.patch of Package wpa_supplicant
Backport of: commit cebee30f3170b5104a41bd27ac5f98615ed57656 Author: Jouni Malinen <j@w1.fi> Date: Wed Jan 14 15:31:28 2015 +0200 Add domain_match network profile parameter This is similar with domain_suffix_match, but required a full match of the domain name rather than allowing suffix match (subdomains) or wildcard certificates. Signed-off-by: Jouni Malinen <j@w1.fi> ================================================================================ --- wpa_supplicant-2.2/src/crypto/tls.h +++ wpa_supplicant-2.2/src/crypto/tls.h @@ -41,7 +41,8 @@ TLS_FAIL_ALTSUBJECT_MISMATCH = 6, TLS_FAIL_BAD_CERTIFICATE = 7, TLS_FAIL_SERVER_CHAIN_PROBE = 8, - TLS_FAIL_DOMAIN_SUFFIX_MISMATCH = 9 + TLS_FAIL_DOMAIN_SUFFIX_MISMATCH = 9, + TLS_FAIL_DOMAIN_MISMATCH = 10 }; union tls_event_data { @@ -101,6 +102,9 @@ * certificate or %NULL to allow all alternative subjects * @suffix_match: String to suffix match in the dNSName or CN of the peer * certificate or %NULL to allow all domain names + * @domain_match: String to match in the dNSName or CN of the peer + * certificate or %NULL to allow all domain names. This requires a full, + * case-insensitive match. * @client_cert: File or reference name for client X.509 certificate in PEM or * DER format * @client_cert_blob: client_cert as inlined data or %NULL if not used @@ -143,6 +147,7 @@ const char *subject_match; const char *altsubject_match; const char *suffix_match; + const char *domain_match; const char *client_cert; const u8 *client_cert_blob; size_t client_cert_blob_len; --- wpa_supplicant-2.2/src/crypto/tls_internal.c +++ wpa_supplicant-2.2/src/crypto/tls_internal.c @@ -190,6 +190,11 @@ if (cred == NULL) return -1; + if (params->domain_match) { + wpa_printf(MSG_INFO, "TLS: domain_match not supported"); + return -1; + } + if (tlsv1_set_ca_cert(cred, params->ca_cert, params->ca_cert_blob, params->ca_cert_blob_len, params->ca_path)) { --- wpa_supplicant-2.2/src/crypto/tls_openssl.c +++ wpa_supplicant-2.2/src/crypto/tls_openssl.c @@ -92,7 +92,7 @@ ENGINE *engine; /* functional reference to the engine */ EVP_PKEY *private_key; /* the private key if using engine */ #endif /* OPENSSL_NO_ENGINE */ - char *subject_match, *altsubject_match, *suffix_match; + char *subject_match, *altsubject_match, *suffix_match, *domain_match; int read_alerts, write_alerts, failed; tls_session_ticket_cb session_ticket_cb; @@ -1072,6 +1072,7 @@ os_free(conn->subject_match); os_free(conn->altsubject_match); os_free(conn->suffix_match); + os_free(conn->domain_match); os_free(conn->session_ticket); os_free(conn); } @@ -1163,7 +1164,8 @@ #ifndef CONFIG_NATIVE_WINDOWS -static int domain_suffix_match(const u8 *val, size_t len, const char *match) +static int domain_suffix_match(const u8 *val, size_t len, const char *match, + int full) { size_t i, match_len; @@ -1176,7 +1178,7 @@ } match_len = os_strlen(match); - if (match_len > len) + if (match_len > len || (full && match_len != len)) return 0; if (os_strncasecmp((const char *) val + len - match_len, match, @@ -1195,7 +1197,7 @@ #endif /* CONFIG_NATIVE_WINDOWS */ -static int tls_match_suffix(X509 *cert, const char *match) +static int tls_match_suffix(X509 *cert, const char *match, int full) { #ifdef CONFIG_NATIVE_WINDOWS /* wincrypt.h has conflicting X509_NAME definition */ @@ -1204,15 +1206,17 @@ GENERAL_NAME *gen; void *ext; int i; + int j; int dns_name = 0; X509_NAME *name; - wpa_printf(MSG_DEBUG, "TLS: Match domain against suffix %s", match); + wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s", + full ? "": "suffix ", match); ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); - for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) { - gen = sk_GENERAL_NAME_value(ext, i); + for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) { + gen = sk_GENERAL_NAME_value(ext, j); if (gen->type != GEN_DNS) continue; dns_name++; @@ -1220,8 +1224,10 @@ gen->d.dNSName->data, gen->d.dNSName->length); if (domain_suffix_match(gen->d.dNSName->data, - gen->d.dNSName->length, match) == 1) { - wpa_printf(MSG_DEBUG, "TLS: Suffix match in dNSName found"); + gen->d.dNSName->length, match, full) == + 1) { + wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found", + full ? "Match" : "Suffix match"); return 1; } } @@ -1248,13 +1254,16 @@ continue; wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName", cn->data, cn->length); - if (domain_suffix_match(cn->data, cn->length, match) == 1) { - wpa_printf(MSG_DEBUG, "TLS: Suffix match in commonName found"); - return 1; - } + if (domain_suffix_match(cn->data, cn->length, match, full) == 1) + { + wpa_printf(MSG_DEBUG, "TLS: %s in commonName found", + full ? "Match" : "Suffix match"); + return 1; + } } - wpa_printf(MSG_DEBUG, "TLS: No CommonName suffix match found"); + wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found", + full ? "": "suffix "); return 0; #endif /* CONFIG_NATIVE_WINDOWS */ } @@ -1388,7 +1397,7 @@ SSL *ssl; struct tls_connection *conn; struct tls_context *context; - char *match, *altmatch, *suffix_match; + char *match, *altmatch, *suffix_match, *domain_match; const char *err_str; err_cert = X509_STORE_CTX_get_current_cert(x509_ctx); @@ -1416,6 +1425,7 @@ match = conn->subject_match; altmatch = conn->altsubject_match; suffix_match = conn->suffix_match; + domain_match = conn->domain_match; if (!preverify_ok && !conn->ca_cert_verify) preverify_ok = 1; @@ -1485,13 +1495,21 @@ "AltSubject mismatch", TLS_FAIL_ALTSUBJECT_MISMATCH); } else if (depth == 0 && suffix_match && - !tls_match_suffix(err_cert, suffix_match)) { + !tls_match_suffix(err_cert, suffix_match, 0)) { wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found", suffix_match); preverify_ok = 0; openssl_tls_fail_event(conn, err_cert, err, depth, buf, "Domain suffix mismatch", TLS_FAIL_DOMAIN_SUFFIX_MISMATCH); + } else if (depth == 0 && domain_match && + !tls_match_suffix(err_cert, domain_match, 1)) { + wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found", + domain_match); + preverify_ok = 0; + openssl_tls_fail_event(conn, err_cert, err, depth, buf, + "Domain mismatch", + TLS_FAIL_DOMAIN_MISMATCH); } else openssl_tls_cert_event(conn, err_cert, depth, buf); @@ -1755,7 +1773,8 @@ static int tls_connection_set_subject_match(struct tls_connection *conn, const char *subject_match, const char *altsubject_match, - const char *suffix_match) + const char *suffix_match, + const char *domain_match) { os_free(conn->subject_match); conn->subject_match = NULL; @@ -1781,6 +1800,14 @@ return -1; } + os_free(conn->domain_match); + conn->domain_match = NULL; + if (domain_match) { + conn->domain_match = os_strdup(domain_match); + if (conn->domain_match == NULL) + return -1; + } + return 0; } @@ -3207,7 +3234,8 @@ if (tls_connection_set_subject_match(conn, params->subject_match, params->altsubject_match, - params->suffix_match)) + params->suffix_match, + params->domain_match)) return -1; if (params->engine && params->ca_cert_id) { --- wpa_supplicant-2.2/src/eap_peer/eap_config.h +++ wpa_supplicant-2.2/src/eap_peer/eap_config.h @@ -225,6 +225,21 @@ */ char *domain_suffix_match; + /** + * domain_match - Constraint for server domain name + * + * If set, this FQDN is used as a full match requirement for the + * server certificate in SubjectAltName dNSName element(s). If a + * matching dNSName is found, this constraint is met. If no dNSName + * values are present, this constraint is matched against SubjectName CN + * using same full match comparison. This behavior is similar to + * domain_suffix_match, but has the requirement of a full match, i.e., + * no subdomains or wildcard matches are allowed. Case-insensitive + * comparison is used, so "Example.com" matches "example.com", but would + * not match "test.Example.com". + */ + char *domain_match; + /** * ca_cert2 - File path to CA certificate file (PEM/DER) (Phase 2) * @@ -329,6 +344,14 @@ char *domain_suffix_match2; /** + * domain_match2 - Constraint for server domain name + * + * This field is like domain_match, but used for phase 2 (inside + * EAP-TTLS/PEAP/FAST tunnel) authentication. + */ + char *domain_match2; + + /** * eap_methods - Allowed EAP methods * * (vendor=EAP_VENDOR_IETF,method=EAP_TYPE_NONE) terminated list of --- wpa_supplicant-2.2/src/eap_peer/eap_tls_common.c +++ wpa_supplicant-2.2/src/eap_peer/eap_tls_common.c @@ -91,6 +91,7 @@ params->subject_match = (char *) config->subject_match; params->altsubject_match = (char *) config->altsubject_match; params->suffix_match = config->domain_suffix_match; + params->domain_match = config->domain_match; params->engine = config->engine; params->engine_id = config->engine_id; params->pin = config->pin; @@ -113,6 +114,7 @@ params->subject_match = (char *) config->subject_match2; params->altsubject_match = (char *) config->altsubject_match2; params->suffix_match = config->domain_suffix_match2; + params->domain_match = config->domain_match2; params->engine = config->engine2; params->engine_id = config->engine2_id; params->pin = config->pin2; --- wpa_supplicant-2.2/wpa_supplicant/config.c +++ wpa_supplicant-2.2/wpa_supplicant/config.c @@ -1641,6 +1641,7 @@ { STRe(subject_match) }, { STRe(altsubject_match) }, { STRe(domain_suffix_match) }, + { STRe(domain_match) }, { STRe(ca_cert2) }, { STRe(ca_path2) }, { STRe(client_cert2) }, @@ -1650,6 +1651,7 @@ { STRe(subject_match2) }, { STRe(altsubject_match2) }, { STRe(domain_suffix_match2) }, + { STRe(domain_match2) }, { STRe(phase1) }, { STRe(phase2) }, { STRe(pcsc) }, @@ -1857,6 +1859,7 @@ os_free(eap->subject_match); os_free(eap->altsubject_match); os_free(eap->domain_suffix_match); + os_free(eap->domain_match); os_free(eap->ca_cert2); os_free(eap->ca_path2); os_free(eap->client_cert2); @@ -1866,6 +1869,7 @@ os_free(eap->subject_match2); os_free(eap->altsubject_match2); os_free(eap->domain_suffix_match2); + os_free(eap->domain_match2); os_free(eap->phase1); os_free(eap->phase2); os_free(eap->pcsc); --- wpa_supplicant-2.2/wpa_supplicant/config_file.c +++ wpa_supplicant-2.2/wpa_supplicant/config_file.c @@ -682,6 +682,7 @@ STR(subject_match); STR(altsubject_match); STR(domain_suffix_match); + STR(domain_match); STR(ca_cert2); STR(ca_path2); STR(client_cert2); @@ -691,6 +692,7 @@ STR(subject_match2); STR(altsubject_match2); STR(domain_suffix_match2); + STR(domain_match2); STR(phase1); STR(phase2); STR(pcsc); --- wpa_supplicant-2.2/wpa_supplicant/wpa_supplicant.conf +++ wpa_supplicant-2.2/wpa_supplicant/wpa_supplicant.conf @@ -810,6 +810,10 @@ # sertificate is only accepted if it contains this string in the subject. # The subject string is in following format: # /C=US/ST=CA/L=San Francisco/CN=Test AS/emailAddress=as@example.com +# Note: Since this is a substring match, this cannot be used securily to +# do a suffix match against a possible domain name in the CN entry. For +# such a use case, domain_match should be used instead. +# instead. # altsubject_match: Semicolon separated string of entries to be matched against # the alternative subject name of the authentication server certificate. # If this string is set, the server sertificate is only accepted if it @@ -818,6 +822,14 @@ # Example: EMAIL:server@example.com # Example: DNS:server.example.com;DNS:server2.example.com # Following types are supported: EMAIL, DNS, URI +# domain_match: Constraint for server domain name +# If set, this FQDN is used as a full match requirement for the +# server certificate in SubjectAltName dNSName element(s). If a +# matching dNSName is found, this constraint is met. If no dNSName +# values are present, this constraint is matched against SubjectName CN +# using same full match comparison. No subdomains or wildcard matches +# are allowed. Case-insensitive comparison is used, so "Example.com" +# matches "example.com", but would not match "test.Example.com". # phase1: Phase1 (outer authentication, i.e., TLS tunnel) parameters # (string with field-value pairs, e.g., "peapver=0" or # "peapver=1 peaplabel=1")
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