| /** |
| * \file session_server_tls.c |
| * \author Michal Vasko <mvasko@cesnet.cz> |
| * \brief libnetconf2 TLS server session manipulation functions |
| * |
| * Copyright (c) 2015 CESNET, z.s.p.o. |
| * |
| * 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. Neither the name of the Company nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| */ |
| |
| #define _GNU_SOURCE |
| |
| #include <string.h> |
| #include <poll.h> |
| |
| #include <openssl/ssl.h> |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/x509v3.h> |
| |
| #include "libnetconf.h" |
| #include "session_server.h" |
| |
| extern struct nc_server_opts server_opts; |
| struct nc_tls_server_opts tls_opts = { |
| .tls_ctx_lock = PTHREAD_MUTEX_INITIALIZER, |
| .crl_lock = PTHREAD_MUTEX_INITIALIZER, |
| .ctn_lock = PTHREAD_MUTEX_INITIALIZER, |
| .verify_once = PTHREAD_ONCE_INIT |
| }; |
| |
| static char * |
| asn1time_to_str(ASN1_TIME *t) |
| { |
| char *cp; |
| BIO *bio; |
| int n; |
| |
| if (!t) { |
| return NULL; |
| } |
| bio = BIO_new(BIO_s_mem()); |
| if (!bio) { |
| return NULL; |
| } |
| ASN1_TIME_print(bio, t); |
| n = BIO_pending(bio); |
| cp = malloc(n + 1); |
| n = BIO_read(bio, cp, n); |
| if (n < 0) { |
| BIO_free(bio); |
| free(cp); |
| return NULL; |
| } |
| cp[n] = '\0'; |
| BIO_free(bio); |
| return cp; |
| } |
| |
| static void |
| digest_to_str(const unsigned char *digest, unsigned int dig_len, char **str) |
| { |
| unsigned int i; |
| |
| *str = malloc(dig_len * 3); |
| for (i = 0; i < dig_len - 1; ++i) { |
| sprintf((*str) + (i * 3), "%02x:", digest[i]); |
| } |
| sprintf((*str) + (i * 3), "%02x", digest[i]); |
| } |
| |
| /* return NULL - SSL error can be retrieved */ |
| static X509 * |
| base64der_to_cert(const char *in) |
| { |
| X509 *out; |
| char *buf; |
| BIO *bio; |
| |
| if (in == NULL) { |
| return NULL; |
| } |
| |
| if (asprintf(&buf, "%s%s%s", "-----BEGIN CERTIFICATE-----\n", in, "\n-----END CERTIFICATE-----") == -1) { |
| return NULL; |
| } |
| bio = BIO_new_mem_buf(buf, strlen(buf)); |
| if (!bio) { |
| free(buf); |
| return NULL; |
| } |
| |
| out = PEM_read_bio_X509(bio, NULL, NULL, NULL); |
| if (!out) { |
| free(buf); |
| BIO_free(bio); |
| return NULL; |
| } |
| |
| free(buf); |
| BIO_free(bio); |
| return out; |
| } |
| |
| /* return NULL - either errno or SSL error */ |
| static X509 * |
| pem_to_cert(const char *path) |
| { |
| FILE *fp; |
| X509 *out; |
| |
| fp = fopen(path, "r"); |
| if (!fp) { |
| return NULL; |
| } |
| |
| out = PEM_read_X509(fp, NULL, NULL, NULL); |
| fclose(fp); |
| return out; |
| } |
| |
| static EVP_PKEY * |
| base64der_to_privatekey(const char *in, int rsa) |
| { |
| EVP_PKEY *out; |
| char *buf; |
| BIO *bio; |
| |
| if (in == NULL) { |
| return NULL; |
| } |
| |
| if (asprintf(&buf, "%s%s%s%s%s%s%s", "-----BEGIN ", (rsa ? "RSA" : "DSA"), " PRIVATE KEY-----\n", in, "\n-----END ", (rsa ? "RSA" : "DSA"), " PRIVATE KEY-----") == -1) { |
| return NULL; |
| } |
| bio = BIO_new_mem_buf(buf, strlen(buf)); |
| if (!bio) { |
| free(buf); |
| return NULL; |
| } |
| |
| out = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL); |
| if (!out) { |
| free(buf); |
| BIO_free(bio); |
| return NULL; |
| } |
| |
| free(buf); |
| BIO_free(bio); |
| return out; |
| } |
| |
| static int |
| cert_pubkey_match(X509 *cert1, X509 *cert2) |
| { |
| ASN1_BIT_STRING *bitstr1, *bitstr2; |
| |
| bitstr1 = X509_get0_pubkey_bitstr(cert1); |
| bitstr2 = X509_get0_pubkey_bitstr(cert2); |
| |
| if (!bitstr1 || !bitstr2 || (bitstr1->length != bitstr2->length) || |
| memcmp(bitstr1->data, bitstr2->data, bitstr1->length)) { |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int |
| nc_tls_ctn_get_username_from_cert(X509 *client_cert, NC_TLS_CTN_MAPTYPE map_type, char **username) |
| { |
| STACK_OF(GENERAL_NAME) *san_names; |
| GENERAL_NAME *san_name; |
| ASN1_OCTET_STRING *ip; |
| int i, san_count; |
| char *subject, *common_name; |
| |
| if (map_type == NC_TLS_CTN_COMMON_NAME) { |
| subject = X509_NAME_oneline(X509_get_subject_name(client_cert), NULL, 0); |
| common_name = strstr(subject, "CN="); |
| if (!common_name) { |
| WRN("Certificate does not include the commonName field."); |
| free(subject); |
| return 1; |
| } |
| common_name += 3; |
| if (strchr(common_name, '/')) { |
| *strchr(common_name, '/') = '\0'; |
| } |
| *username = strdup(common_name); |
| free(subject); |
| } else { |
| /* retrieve subjectAltName's rfc822Name (email), dNSName and iPAddress values */ |
| san_names = X509_get_ext_d2i(client_cert, NID_subject_alt_name, NULL, NULL); |
| if (!san_names) { |
| WRN("Certificate has no SANs or failed to retrieve them."); |
| return 1; |
| } |
| |
| san_count = sk_GENERAL_NAME_num(san_names); |
| for (i = 0; i < san_count; ++i) { |
| san_name = sk_GENERAL_NAME_value(san_names, i); |
| |
| /* rfc822Name (email) */ |
| if ((map_type == NC_TLS_CTN_SAN_ANY || map_type == NC_TLS_CTN_SAN_RFC822_NAME) && |
| san_name->type == GEN_EMAIL) { |
| *username = strdup((char *)ASN1_STRING_data(san_name->d.rfc822Name)); |
| break; |
| } |
| |
| /* dNSName */ |
| if ((map_type == NC_TLS_CTN_SAN_ANY || map_type == NC_TLS_CTN_SAN_DNS_NAME) && |
| san_name->type == GEN_DNS) { |
| *username = strdup((char *)ASN1_STRING_data(san_name->d.dNSName)); |
| break; |
| } |
| |
| /* iPAddress */ |
| if ((map_type == NC_TLS_CTN_SAN_ANY || map_type == NC_TLS_CTN_SAN_IP_ADDRESS) && |
| san_name->type == GEN_IPADD) { |
| ip = san_name->d.iPAddress; |
| if (ip->length == 4) { |
| if (asprintf(username, "%d.%d.%d.%d", ip->data[0], ip->data[1], ip->data[2], ip->data[3]) == -1) { |
| ERRMEM; |
| sk_GENERAL_NAME_pop_free(san_names, GENERAL_NAME_free); |
| return -1; |
| } |
| break; |
| } else if (ip->length == 16) { |
| if (asprintf(username, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", |
| ip->data[0], ip->data[1], ip->data[2], ip->data[3], ip->data[4], ip->data[5], |
| ip->data[6], ip->data[7], ip->data[8], ip->data[9], ip->data[10], ip->data[11], |
| ip->data[12], ip->data[13], ip->data[14], ip->data[15]) == -1) { |
| ERRMEM; |
| sk_GENERAL_NAME_pop_free(san_names, GENERAL_NAME_free); |
| return -1; |
| } |
| break; |
| } else { |
| WRN("SAN IP address in an unknown format (length is %d).", ip->length); |
| } |
| } |
| } |
| sk_GENERAL_NAME_pop_free(san_names, GENERAL_NAME_free); |
| |
| if (i < san_count) { |
| switch (map_type) { |
| case NC_TLS_CTN_SAN_RFC822_NAME: |
| WRN("Certificate does not include the SAN rfc822Name field."); |
| break; |
| case NC_TLS_CTN_SAN_DNS_NAME: |
| WRN("Certificate does not include the SAN dNSName field."); |
| break; |
| case NC_TLS_CTN_SAN_IP_ADDRESS: |
| WRN("Certificate does not include the SAN iPAddress field."); |
| break; |
| case NC_TLS_CTN_SAN_ANY: |
| WRN("Certificate does not include any relevant SAN fields."); |
| break; |
| default: |
| break; |
| } |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* return: 0 - OK, 1 - no match, -1 - error */ |
| static int |
| nc_tls_cert_to_name(X509 *cert, NC_TLS_CTN_MAPTYPE *map_type, const char **name) |
| { |
| char *digest_md5 = NULL, *digest_sha1 = NULL, *digest_sha224 = NULL; |
| char *digest_sha256 = NULL, *digest_sha384 = NULL, *digest_sha512 = NULL; |
| unsigned char *buf = malloc(64); |
| unsigned int buf_len = 64; |
| int ret = 0; |
| struct nc_ctn *ctn; |
| |
| if (!cert || !map_type || !name) { |
| free(buf); |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.ctn_lock); |
| |
| for (ctn = tls_opts.ctn; ctn; ctn = ctn->next) { |
| /* MD5 */ |
| if (!strncmp(ctn->fingerprint, "01", 2)) { |
| if (!digest_md5) { |
| if (X509_digest(cert, EVP_md5(), buf, &buf_len) != 1) { |
| ERR("Calculating MD5 digest failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| ret = -1; |
| goto cleanup; |
| } |
| digest_to_str(buf, buf_len, &digest_md5); |
| } |
| |
| if (!strcasecmp(ctn->fingerprint + 3, digest_md5)) { |
| /* we got ourselves a winner! */ |
| VRB("Cert verify CTN: entry with a matching fingerprint found."); |
| *map_type = ctn->map_type; |
| if (ctn->map_type == NC_TLS_CTN_SPECIFIED) { |
| *name = ctn->name; |
| } |
| break; |
| } |
| |
| /* SHA-1 */ |
| } else if (!strncmp(ctn->fingerprint, "02", 2)) { |
| if (!digest_sha1) { |
| if (X509_digest(cert, EVP_sha1(), buf, &buf_len) != 1) { |
| ERR("Calculating SHA-1 digest failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| ret = -1; |
| goto cleanup; |
| } |
| digest_to_str(buf, buf_len, &digest_sha1); |
| } |
| |
| if (!strcasecmp(ctn->fingerprint + 3, digest_sha1)) { |
| /* we got ourselves a winner! */ |
| VRB("Cert verify CTN: entry with a matching fingerprint found."); |
| *map_type = ctn->map_type; |
| if (ctn->map_type == NC_TLS_CTN_SPECIFIED) { |
| *name = ctn->name; |
| } |
| break; |
| } |
| |
| /* SHA-224 */ |
| } else if (!strncmp(ctn->fingerprint, "03", 2)) { |
| if (!digest_sha224) { |
| if (X509_digest(cert, EVP_sha224(), buf, &buf_len) != 1) { |
| ERR("Calculating SHA-224 digest failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| ret = -1; |
| goto cleanup; |
| } |
| digest_to_str(buf, buf_len, &digest_sha224); |
| } |
| |
| if (!strcasecmp(ctn->fingerprint + 3, digest_sha224)) { |
| /* we got ourselves a winner! */ |
| VRB("Cert verify CTN: entry with a matching fingerprint found."); |
| *map_type = ctn->map_type; |
| if (ctn->map_type == NC_TLS_CTN_SPECIFIED) { |
| *name = ctn->name; |
| } |
| break; |
| } |
| |
| /* SHA-256 */ |
| } else if (!strncmp(ctn->fingerprint, "04", 2)) { |
| if (!digest_sha256) { |
| if (X509_digest(cert, EVP_sha256(), buf, &buf_len) != 1) { |
| ERR("Calculating SHA-256 digest failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| ret = -1; |
| goto cleanup; |
| } |
| digest_to_str(buf, buf_len, &digest_sha256); |
| } |
| |
| if (!strcasecmp(ctn->fingerprint + 3, digest_sha256)) { |
| /* we got ourselves a winner! */ |
| VRB("Cert verify CTN: entry with a matching fingerprint found."); |
| *map_type = ctn->map_type; |
| if (ctn->map_type == NC_TLS_CTN_SPECIFIED) { |
| *name = ctn->name; |
| } |
| break; |
| } |
| |
| /* SHA-384 */ |
| } else if (!strncmp(ctn->fingerprint, "05", 2)) { |
| if (!digest_sha384) { |
| if (X509_digest(cert, EVP_sha384(), buf, &buf_len) != 1) { |
| ERR("Calculating SHA-384 digest failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| ret = -1; |
| goto cleanup; |
| } |
| digest_to_str(buf, buf_len, &digest_sha384); |
| } |
| |
| if (!strcasecmp(ctn->fingerprint + 3, digest_sha384)) { |
| /* we got ourselves a winner! */ |
| VRB("Cert verify CTN: entry with a matching fingerprint found."); |
| *map_type = ctn->map_type; |
| if (ctn->map_type == NC_TLS_CTN_SPECIFIED) { |
| *name = ctn->name; |
| } |
| break; |
| } |
| |
| /* SHA-512 */ |
| } else if (!strncmp(ctn->fingerprint, "06", 2)) { |
| if (!digest_sha512) { |
| if (X509_digest(cert, EVP_sha512(), buf, &buf_len) != 1) { |
| ERR("Calculating SHA-512 digest failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| ret = -1; |
| goto cleanup; |
| } |
| digest_to_str(buf, buf_len, &digest_sha512); |
| } |
| |
| if (!strcasecmp(ctn->fingerprint + 3, digest_sha512)) { |
| /* we got ourselves a winner! */ |
| VRB("Cert verify CTN: entry with a matching fingerprint found."); |
| *map_type = ctn->map_type; |
| if (ctn->map_type == NC_TLS_CTN_SPECIFIED) { |
| *name = ctn->name; |
| } |
| break; |
| } |
| |
| /* unknown */ |
| } else { |
| WRN("Unknown fingerprint algorithm used (%s), skipping.", ctn->fingerprint); |
| } |
| } |
| |
| if (!ctn) { |
| ret = 1; |
| } |
| |
| cleanup: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.ctn_lock); |
| |
| free(digest_md5); |
| free(digest_sha1); |
| free(digest_sha224); |
| free(digest_sha256); |
| free(digest_sha384); |
| free(digest_sha512); |
| free(buf); |
| return ret; |
| } |
| |
| static int |
| nc_tlsclb_verify(int preverify_ok, X509_STORE_CTX *x509_ctx) |
| { |
| X509_STORE_CTX store_ctx; |
| X509_OBJECT obj; |
| X509_NAME *subject; |
| X509_NAME *issuer; |
| X509 *cert; |
| X509_CRL *crl; |
| X509_REVOKED *revoked; |
| STACK_OF(X509) *cert_stack; |
| EVP_PKEY *pubkey; |
| struct nc_session* session; |
| long serial; |
| int i, n, rc, depth; |
| char *cp; |
| const char *username = NULL; |
| NC_TLS_CTN_MAPTYPE map_type = 0; |
| ASN1_TIME *last_update = NULL, *next_update = NULL; |
| |
| /* get the thread session */ |
| session = pthread_getspecific(tls_opts.verify_key); |
| |
| /* get the last certificate, that is the peer (client) certificate */ |
| if (!session->tls_cert) { |
| cert_stack = X509_STORE_CTX_get1_chain(x509_ctx); |
| /* TODO all that is needed, but function X509_up_ref not present in older OpenSSL versions |
| session->cert = sk_X509_value(cert_stack, sk_X509_num(cert_stack) - 1); |
| X509_up_ref(session->cert); |
| sk_X509_pop_free(cert_stack, X509_free); */ |
| while ((cert = sk_X509_pop(cert_stack))) { |
| X509_free(session->tls_cert); |
| session->tls_cert = cert; |
| } |
| sk_X509_pop_free(cert_stack, X509_free); |
| } |
| |
| /* standard certificate verification failed, so a trusted client cert must match to continue */ |
| if (!preverify_ok) { |
| subject = X509_get_subject_name(session->tls_cert); |
| cert_stack = X509_STORE_get1_certs(x509_ctx, subject); |
| if (cert_stack) { |
| for (i = 0; i < sk_X509_num(cert_stack); ++i) { |
| if (cert_pubkey_match(session->tls_cert, sk_X509_value(cert_stack, i))) { |
| /* we are just overriding the failed standard certificate verification (preverify_ok == 0), |
| * this callback will be called again with the same current certificate and preverify_ok == 1 */ |
| VRB("Cert verify: fail (%s), but the client certificate is trusted, continuing.", |
| X509_verify_cert_error_string(X509_STORE_CTX_get_error(x509_ctx))); |
| X509_STORE_CTX_set_error(x509_ctx, X509_V_OK); |
| sk_X509_pop_free(cert_stack, X509_free); |
| return 1; |
| } |
| } |
| sk_X509_pop_free(cert_stack, X509_free); |
| } |
| |
| ERR("Cert verify: fail (%s).", X509_verify_cert_error_string(X509_STORE_CTX_get_error(x509_ctx))); |
| return 0; |
| } |
| |
| /* print cert verify info */ |
| depth = X509_STORE_CTX_get_error_depth(x509_ctx); |
| VRB("Cert verify: depth %d.", depth); |
| |
| cert = X509_STORE_CTX_get_current_cert(x509_ctx); |
| subject = X509_get_subject_name(cert); |
| issuer = X509_get_issuer_name(cert); |
| |
| cp = X509_NAME_oneline(subject, NULL, 0); |
| VRB("Cert verify: subject: %s.", cp); |
| OPENSSL_free(cp); |
| cp = X509_NAME_oneline(issuer, NULL, 0); |
| VRB("Cert verify: issuer: %s.", cp); |
| OPENSSL_free(cp); |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.crl_lock); |
| |
| /* check for revocation if set */ |
| if (tls_opts.crl_store) { |
| /* try to retrieve a CRL corresponding to the _subject_ of |
| * the current certificate in order to verify it's integrity */ |
| memset((char *)&obj, 0, sizeof(obj)); |
| X509_STORE_CTX_init(&store_ctx, tls_opts.crl_store, NULL, NULL); |
| rc = X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, subject, &obj); |
| X509_STORE_CTX_cleanup(&store_ctx); |
| crl = obj.data.crl; |
| if (rc > 0 && crl) { |
| cp = X509_NAME_oneline(subject, NULL, 0); |
| VRB("Cert verify CRL: issuer: %s.", cp); |
| OPENSSL_free(cp); |
| |
| last_update = X509_CRL_get_lastUpdate(crl); |
| next_update = X509_CRL_get_nextUpdate(crl); |
| cp = asn1time_to_str(last_update); |
| VRB("Cert verify CRL: last update: %s.", cp); |
| free(cp); |
| cp = asn1time_to_str(next_update); |
| VRB("Cert verify CRL: next update: %s.", cp); |
| free(cp); |
| |
| /* verify the signature on this CRL */ |
| pubkey = X509_get_pubkey(cert); |
| if (X509_CRL_verify(crl, pubkey) <= 0) { |
| ERR("Cert verify CRL: invalid signature."); |
| X509_STORE_CTX_set_error(x509_ctx, X509_V_ERR_CRL_SIGNATURE_FAILURE); |
| X509_OBJECT_free_contents(&obj); |
| if (pubkey) { |
| EVP_PKEY_free(pubkey); |
| } |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return 0; |
| } |
| if (pubkey) { |
| EVP_PKEY_free(pubkey); |
| } |
| |
| /* check date of CRL to make sure it's not expired */ |
| if (!next_update) { |
| ERR("Cert verify CRL: invalid nextUpdate field."); |
| X509_STORE_CTX_set_error(x509_ctx, X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD); |
| X509_OBJECT_free_contents(&obj); |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return 0; |
| } |
| if (X509_cmp_current_time(next_update) < 0) { |
| ERR("Cert verify CRL: expired - revoking all certificates."); |
| X509_STORE_CTX_set_error(x509_ctx, X509_V_ERR_CRL_HAS_EXPIRED); |
| X509_OBJECT_free_contents(&obj); |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return 0; |
| } |
| X509_OBJECT_free_contents(&obj); |
| } |
| |
| /* try to retrieve a CRL corresponding to the _issuer_ of |
| * the current certificate in order to check for revocation */ |
| memset((char *)&obj, 0, sizeof(obj)); |
| X509_STORE_CTX_init(&store_ctx, tls_opts.crl_store, NULL, NULL); |
| rc = X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, issuer, &obj); |
| X509_STORE_CTX_cleanup(&store_ctx); |
| crl = obj.data.crl; |
| if (rc > 0 && crl) { |
| /* check if the current certificate is revoked by this CRL */ |
| n = sk_X509_REVOKED_num(X509_CRL_get_REVOKED(crl)); |
| for (i = 0; i < n; i++) { |
| revoked = sk_X509_REVOKED_value(X509_CRL_get_REVOKED(crl), i); |
| if (ASN1_INTEGER_cmp(revoked->serialNumber, X509_get_serialNumber(cert)) == 0) { |
| serial = ASN1_INTEGER_get(revoked->serialNumber); |
| cp = X509_NAME_oneline(issuer, NULL, 0); |
| ERR("Cert verify CRL: certificate with serial %ld (0x%lX) revoked per CRL from issuer %s.", serial, serial, cp); |
| OPENSSL_free(cp); |
| X509_STORE_CTX_set_error(x509_ctx, X509_V_ERR_CERT_REVOKED); |
| X509_OBJECT_free_contents(&obj); |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return 0; |
| } |
| } |
| X509_OBJECT_free_contents(&obj); |
| } |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| |
| /* cert-to-name already successful */ |
| if (session->username) { |
| return 1; |
| } |
| |
| /* cert-to-name */ |
| rc = nc_tls_cert_to_name(cert, &map_type, &username); |
| if (rc) { |
| if (rc == -1) { |
| /* fatal error */ |
| depth = 0; |
| } |
| /* rc == 1 is a normal CTN fail (no match found) */ |
| goto fail; |
| } |
| |
| /* cert-to-name match, now to extract the specific field from the peer cert */ |
| if (map_type == NC_TLS_CTN_SPECIFIED) { |
| nc_ctx_lock(-1, NULL); |
| session->username = lydict_insert(server_opts.ctx, username, 0); |
| nc_ctx_unlock(); |
| } else { |
| rc = nc_tls_ctn_get_username_from_cert(session->tls_cert, map_type, &cp); |
| if (rc) { |
| if (rc == -1) { |
| depth = 0; |
| } |
| goto fail; |
| } |
| nc_ctx_lock(-1, NULL); |
| session->username = lydict_insert_zc(server_opts.ctx, cp); |
| nc_ctx_unlock(); |
| } |
| |
| VRB("Cert verify CTN: new client username recognized as \"%s\".", session->username); |
| return 1; |
| |
| fail: |
| if (depth > 0) { |
| VRB("Cert verify CTN: cert fail, cert-to-name will continue on the next cert in chain."); |
| return 1; |
| } |
| |
| VRB("Cert-to-name unsuccessful, dropping the new client."); |
| X509_STORE_CTX_set_error(x509_ctx, X509_V_ERR_APPLICATION_VERIFICATION); |
| return 0; |
| } |
| |
| API int |
| nc_tls_server_set_cert(const char *cert) |
| { |
| X509 *x509_cert; |
| |
| if (!cert) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| x509_cert = base64der_to_cert(cert); |
| if (!x509_cert || (SSL_CTX_use_certificate(tls_opts.tls_ctx, x509_cert) != 1)) { |
| ERR("Loading the server certificate failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| X509_free(x509_cert); |
| goto fail; |
| } |
| X509_free(x509_cert); |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API int |
| nc_tls_server_set_cert_path(const char *cert_path) |
| { |
| if (!cert_path) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| if (SSL_CTX_use_certificate_file(tls_opts.tls_ctx, cert_path, SSL_FILETYPE_PEM) != 1) { |
| ERR("Loading the server certificate failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| goto fail; |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API int |
| nc_tls_server_set_key(const char *privkey, int is_rsa) |
| { |
| EVP_PKEY *key;; |
| |
| if (!privkey) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| key = base64der_to_privatekey(privkey, is_rsa); |
| if (!key || (SSL_CTX_use_PrivateKey(tls_opts.tls_ctx, key) != 1)) { |
| ERR("Loading the server private key failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| EVP_PKEY_free(key); |
| goto fail; |
| } |
| EVP_PKEY_free(key); |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API int |
| nc_tls_server_set_key_path(const char *privkey_path) |
| { |
| if (!privkey_path) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| if (SSL_CTX_use_PrivateKey_file(tls_opts.tls_ctx, privkey_path, SSL_FILETYPE_PEM) != 1) { |
| ERR("Loading the server private key failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| goto fail; |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API int |
| nc_tls_server_add_trusted_cert(const char *cert) |
| { |
| X509_STORE *cert_store; |
| X509 *x509_cert; |
| |
| if (!cert) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| cert_store = SSL_CTX_get_cert_store(tls_opts.tls_ctx); |
| if (!cert_store) { |
| cert_store = X509_STORE_new(); |
| SSL_CTX_set_cert_store(tls_opts.tls_ctx, cert_store); |
| } |
| |
| x509_cert = base64der_to_cert(cert); |
| if (!x509_cert || (X509_STORE_add_cert(cert_store, x509_cert) != 1)) { |
| ERR("Adding a trusted certificate failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| X509_free(x509_cert); |
| goto fail; |
| } |
| X509_free(x509_cert); |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API int |
| nc_tls_server_add_trusted_cert_path(const char *cert_path) |
| { |
| X509_STORE *cert_store; |
| X509 *x509_cert; |
| |
| if (!cert_path) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| cert_store = SSL_CTX_get_cert_store(tls_opts.tls_ctx); |
| if (!cert_store) { |
| cert_store = X509_STORE_new(); |
| SSL_CTX_set_cert_store(tls_opts.tls_ctx, cert_store); |
| } |
| |
| errno = 0; |
| x509_cert = pem_to_cert(cert_path); |
| if (!x509_cert || (X509_STORE_add_cert(cert_store, x509_cert) != 1)) { |
| ERR("Adding a trusted certificate failed (%s).", |
| (errno ? strerror(errno) : ERR_reason_error_string(ERR_get_error()))); |
| X509_free(x509_cert); |
| goto fail; |
| } |
| X509_free(x509_cert); |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API int |
| nc_tls_server_set_trusted_cacert_locations(const char *cacert_file_path, const char *cacert_dir_path) |
| { |
| X509_STORE *cert_store; |
| X509_LOOKUP *lookup; |
| |
| if (!cacert_file_path && !cacert_dir_path) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| tls_opts.tls_ctx = SSL_CTX_new(TLSv1_2_server_method()); |
| if (!tls_opts.tls_ctx) { |
| ERR("Failed to create TLS context."); |
| goto fail; |
| } |
| SSL_CTX_set_verify(tls_opts.tls_ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, nc_tlsclb_verify); |
| } |
| |
| cert_store = SSL_CTX_get_cert_store(tls_opts.tls_ctx); |
| if (!cert_store) { |
| cert_store = X509_STORE_new(); |
| SSL_CTX_set_cert_store(tls_opts.tls_ctx, cert_store); |
| } |
| |
| if (cacert_file_path) { |
| lookup = X509_STORE_add_lookup(cert_store, X509_LOOKUP_file()); |
| if (!lookup) { |
| ERR("Failed to add a lookup method."); |
| goto fail; |
| } |
| |
| if (X509_LOOKUP_load_file(lookup, cacert_file_path, X509_FILETYPE_PEM) != 1) { |
| ERR("Failed to add a trusted cert file (%s).", ERR_reason_error_string(ERR_get_error())); |
| goto fail; |
| } |
| } |
| |
| if (cacert_dir_path) { |
| lookup = X509_STORE_add_lookup(cert_store, X509_LOOKUP_hash_dir()); |
| if (!lookup) { |
| ERR("Failed to add a lookup method."); |
| goto fail; |
| } |
| |
| if (X509_LOOKUP_add_dir(lookup, cacert_dir_path, X509_FILETYPE_PEM) != 1) { |
| ERR("Failed to add a trusted cert directory (%s).", ERR_reason_error_string(ERR_get_error())); |
| goto fail; |
| } |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return -1; |
| } |
| |
| API void |
| nc_tls_server_destroy_certs(void) |
| { |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.tls_ctx_lock); |
| |
| if (!tls_opts.tls_ctx) { |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| return; |
| } |
| |
| SSL_CTX_free(tls_opts.tls_ctx); |
| tls_opts.tls_ctx = NULL; |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| } |
| |
| API int |
| nc_tls_server_set_crl_locations(const char *crl_file_path, const char *crl_dir_path) |
| { |
| X509_LOOKUP *lookup; |
| |
| if (!crl_file_path && !crl_dir_path) { |
| ERRARG; |
| return -1; |
| } |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.crl_lock); |
| |
| if (!tls_opts.crl_store) { |
| tls_opts.crl_store = X509_STORE_new(); |
| } |
| |
| if (crl_file_path) { |
| lookup = X509_STORE_add_lookup(tls_opts.crl_store, X509_LOOKUP_file()); |
| if (!lookup) { |
| ERR("Failed to add a lookup method."); |
| goto fail; |
| } |
| |
| if (X509_LOOKUP_load_file(lookup, crl_file_path, X509_FILETYPE_PEM) != 1) { |
| ERR("Failed to add a revocation lookup file (%s).", ERR_reason_error_string(ERR_get_error())); |
| goto fail; |
| } |
| } |
| |
| if (crl_dir_path) { |
| lookup = X509_STORE_add_lookup(tls_opts.crl_store, X509_LOOKUP_hash_dir()); |
| if (!lookup) { |
| ERR("Failed to add a lookup method."); |
| goto fail; |
| } |
| |
| if (X509_LOOKUP_add_dir(lookup, crl_dir_path, X509_FILETYPE_PEM) != 1) { |
| ERR("Failed to add a revocation lookup directory (%s).", ERR_reason_error_string(ERR_get_error())); |
| goto fail; |
| } |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return 0; |
| |
| fail: |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return -1; |
| } |
| |
| API void |
| nc_tls_server_destroy_crls(void) |
| { |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.crl_lock); |
| |
| if (!tls_opts.crl_store) { |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| return; |
| } |
| |
| X509_STORE_free(tls_opts.crl_store); |
| tls_opts.crl_store = NULL; |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.crl_lock); |
| } |
| |
| API int |
| nc_tls_server_add_ctn(uint32_t id, const char *fingerprint, NC_TLS_CTN_MAPTYPE map_type, const char *name) |
| { |
| struct nc_ctn *ctn, *new; |
| |
| if (!fingerprint || !map_type || ((map_type == NC_TLS_CTN_SPECIFIED) && !name) |
| || ((map_type != NC_TLS_CTN_SPECIFIED) && name)) { |
| ERRARG; |
| return -1; |
| } |
| |
| new = malloc(sizeof *new); |
| |
| nc_ctx_lock(-1, NULL); |
| new->fingerprint = lydict_insert(server_opts.ctx, fingerprint, 0); |
| new->name = lydict_insert(server_opts.ctx, name, 0); |
| nc_ctx_unlock(); |
| new->id = id; |
| new->map_type = map_type; |
| new->next = NULL; |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.ctn_lock); |
| |
| if (!tls_opts.ctn) { |
| /* the first item */ |
| tls_opts.ctn = new; |
| } else if (tls_opts.ctn->id > id) { |
| /* insert at the beginning */ |
| new->next = tls_opts.ctn; |
| tls_opts.ctn = new; |
| } else { |
| for (ctn = tls_opts.ctn; ctn->next && ctn->next->id <= id; ctn = ctn->next); |
| /* insert after ctn */ |
| new->next = ctn->next; |
| ctn->next = new; |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.ctn_lock); |
| |
| return 0; |
| } |
| |
| API int |
| nc_tls_server_del_ctn(int64_t id, const char *fingerprint, NC_TLS_CTN_MAPTYPE map_type, const char *name) |
| { |
| int ret = -1; |
| struct nc_ctn *ctn, *next, *prev; |
| |
| /* LOCK */ |
| pthread_mutex_lock(&tls_opts.ctn_lock); |
| |
| if ((id < 0) && !fingerprint && !map_type && !name) { |
| ctn = tls_opts.ctn; |
| nc_ctx_lock(-1, NULL); |
| while (ctn) { |
| lydict_remove(server_opts.ctx, ctn->fingerprint); |
| lydict_remove(server_opts.ctx, ctn->name); |
| |
| next = ctn->next; |
| free(ctn); |
| ctn = next; |
| |
| ret = 0; |
| } |
| nc_ctx_unlock(); |
| tls_opts.ctn = NULL; |
| } else { |
| prev = NULL; |
| ctn = tls_opts.ctn; |
| while (ctn) { |
| if (((id < 0) || (ctn->id == id)) |
| && (!fingerprint || !strcmp(ctn->fingerprint, fingerprint)) |
| && (!map_type || (ctn->map_type == map_type)) |
| && (!name || (ctn->name && !strcmp(ctn->name, name)))) { |
| nc_ctx_lock(-1, NULL); |
| lydict_remove(server_opts.ctx, ctn->fingerprint); |
| lydict_remove(server_opts.ctx, ctn->name); |
| nc_ctx_unlock(); |
| |
| if (prev) { |
| prev->next = ctn->next; |
| next = ctn->next; |
| } else { |
| tls_opts.ctn = ctn->next; |
| next = ctn->next; |
| } |
| free(ctn); |
| ctn = next; |
| |
| ret = 0; |
| } else { |
| prev = ctn; |
| ctn = ctn->next; |
| } |
| } |
| } |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.ctn_lock); |
| |
| return ret; |
| } |
| |
| API void |
| nc_tls_server_free_opts(void) |
| { |
| nc_tls_server_destroy_certs(); |
| nc_tls_server_destroy_crls(); |
| nc_tls_server_del_ctn(-1, NULL, 0, NULL); |
| } |
| |
| static void |
| nc_tls_make_verify_key(void) |
| { |
| pthread_key_create(&tls_opts.verify_key, NULL); |
| } |
| |
| int |
| nc_accept_tls_session(struct nc_session *session, int sock, int timeout) |
| { |
| int ret, elapsed = 0; |
| struct pollfd pfd; |
| struct timespec old_ts, new_ts; |
| |
| pfd.fd = sock; |
| pfd.events = POLLIN; |
| pfd.revents = 0; |
| |
| if (timeout > 0) { |
| clock_gettime(CLOCK_MONOTONIC_RAW, &old_ts); |
| } |
| |
| /* poll for a new connection */ |
| errno = 0; |
| ret = poll(&pfd, 1, timeout); |
| if (!ret) { |
| /* we timeouted */ |
| close(sock); |
| return 0; |
| } else if (ret == -1) { |
| ERR("poll failed (%s).", strerror(errno)); |
| close(sock); |
| return -1; |
| } |
| |
| if (timeout > 0) { |
| /* decrease timeout */ |
| clock_gettime(CLOCK_MONOTONIC_RAW, &new_ts); |
| |
| elapsed = (new_ts.tv_sec - old_ts.tv_sec) * 1000; |
| elapsed += (new_ts.tv_nsec - old_ts.tv_nsec) / 1000000; |
| } |
| |
| /* data waiting, prepare session */ |
| session->ti_type = NC_TI_OPENSSL; |
| |
| /* LOCK */ |
| ret = nc_timedlock(&tls_opts.tls_ctx_lock, timeout, &elapsed); |
| if (ret < 1) { |
| return ret; |
| } |
| |
| session->ti.tls = SSL_new(tls_opts.tls_ctx); |
| |
| /* UNLOCK */ |
| pthread_mutex_unlock(&tls_opts.tls_ctx_lock); |
| |
| if (!session->ti.tls) { |
| ERR("Failed to create TLS structure from context."); |
| close(sock); |
| return -1; |
| } |
| |
| SSL_set_fd(session->ti.tls, sock); |
| SSL_set_mode(session->ti.tls, SSL_MODE_AUTO_RETRY); |
| |
| /* store session on per-thread basis */ |
| pthread_once(&tls_opts.verify_once, nc_tls_make_verify_key); |
| pthread_setspecific(tls_opts.verify_key, session); |
| |
| ret = SSL_accept(session->ti.tls); |
| |
| if (ret != 1) { |
| switch (SSL_get_error(session->ti.tls, ret)) { |
| case SSL_ERROR_SYSCALL: |
| ERR("SSL_accept failed (%s).", strerror(errno)); |
| break; |
| case SSL_ERROR_SSL: |
| ERR("SSL_accept failed (%s).", ERR_reason_error_string(ERR_get_error())); |
| break; |
| default: |
| ERR("SSL_accept failed."); |
| break; |
| } |
| return -1; |
| } |
| |
| return 1; |
| } |