X-Git-Url: http://git.code-monkey.de/?a=blobdiff_plain;f=src%2Fssl.c;h=e7a53a21d55810354c48d814a52ed58472033a10;hb=fc3918dc9bc7153ba7ec938aad57a6060ce33e5c;hp=dc2245352b6fff895948f665ceca3087c5861c4a;hpb=14a67bc74c81651015bbbad075f7eb1c41218cf7;p=umurmur.git diff --git a/src/ssl.c b/src/ssl.c index dc22453..e7a53a2 100644 --- a/src/ssl.c +++ b/src/ssl.c @@ -1,5 +1,5 @@ -/* Copyright (C) 2009-2010, Martin Johansson - Copyright (C) 2005-2010, Thorvald Natvig +/* Copyright (C) 2009-2012, Martin Johansson + Copyright (C) 2005-2012, Thorvald Natvig All rights reserved. @@ -46,24 +46,27 @@ #include #include -#define CA_CRT_FILENAME "ca.crt" - +#ifdef POLARSSL_API_V1_2 +int ciphers[] = +{ + TLS_DHE_RSA_WITH_AES_256_CBC_SHA, + TLS_RSA_WITH_AES_256_CBC_SHA, + TLS_RSA_WITH_AES_128_CBC_SHA, + 0 +}; +#else int ciphers[] = { SSL_EDH_RSA_AES_256_SHA, - SSL_EDH_RSA_CAMELLIA_256_SHA, - SSL_EDH_RSA_DES_168_SHA, SSL_RSA_AES_256_SHA, - SSL_RSA_CAMELLIA_256_SHA, SSL_RSA_AES_128_SHA, - SSL_RSA_CAMELLIA_128_SHA, - SSL_RSA_DES_168_SHA, - SSL_RSA_RC4_128_SHA, - SSL_RSA_RC4_128_MD5, 0 }; +#endif static x509_cert certificate; static rsa_context key; +bool_t builtInTestCertificate; + havege_state hs; /* exported to crypt.c */ /* DH prime */ @@ -77,37 +80,46 @@ char *my_dhm_P = "DEF409C08E8AC24D1732A6128D2220DC53"; char *my_dhm_G = "4"; +static void initTestCert() +{ + int rc; + builtInTestCertificate = true; + rc = x509parse_crt(&certificate, (unsigned char *)test_srv_crt, + strlen(test_srv_crt)); + if (rc != 0) + Log_fatal("Could not parse built-in test certificate"); +} + +static void initTestKey() +{ + int rc; + + rc = x509parse_key(&key, (unsigned char *)test_srv_key, + strlen(test_srv_key), NULL, 0); + if (rc != 0) + Log_fatal("Could not parse built-in test RSA key"); +} + +/* + * How to generate a self-signed cert with openssl: + * openssl genrsa 1024 > host.key + * openssl req -new -x509 -nodes -sha1 -days 365 -key host.key > host.cert + */ static void initCert() { int rc; char *crtfile = (char *)getStrConf(CERTIFICATE); - char *ca_file, *p; - if (crtfile == NULL) - Log_fatal("No certificate file specified"); + if (crtfile == NULL) { + Log_warn("No certificate file specified"); + initTestCert(); + return; + } rc = x509parse_crtfile(&certificate, crtfile); - if (rc != 0) - Log_fatal("Could not read certificate file %s", crtfile); - - /* Look for CA certificate file in same dir */ - ca_file = malloc(strlen(crtfile) + strlen(CA_CRT_FILENAME) + 1); - strcpy(ca_file, crtfile); - p = strrchr(ca_file, '/'); - if (p != NULL) - strcpy(p + 1, CA_CRT_FILENAME); - else - strcpy(ca_file, CA_CRT_FILENAME); - - rc = x509parse_crtfile(&certificate, ca_file); - if (rc != 0) { /* No CA certifiacte found. Assume self-signed. */ - Log_info("CA certificate file %s not found. Assuming self-signed certificate.", ca_file); - /* - * Apparently PolarSSL needs to read something more into certificate chain. - * Doesn't seem to matter what. Read own certificate again. - */ - rc = x509parse_crtfile(&certificate, crtfile); - if (rc != 0) - Log_fatal("Could not read certificate file %s", crtfile); + if (rc != 0) { + Log_warn("Could not read certificate file %s", crtfile); + initTestCert(); + return; } } @@ -115,7 +127,7 @@ static void initKey() { int rc; char *keyfile = (char *)getStrConf(KEY); - + if (keyfile == NULL) Log_fatal("No key file specified"); rc = x509parse_keyfile(&key, keyfile, NULL); @@ -124,18 +136,32 @@ static void initKey() } #define DEBUG_LEVEL 0 -static void pssl_debug(void *ctx, int level, char *str) +static void pssl_debug(void *ctx, int level, const char *str) { if (level <= DEBUG_LEVEL) - Log_debug("PolarSSL [level %d]: %s", level, str); + Log_info("PolarSSL [level %d]: %s", level, str); } void SSLi_init(void) { + char verstring[12]; + initCert(); - initKey(); + if (builtInTestCertificate) { + Log_warn("*** Using built-in test certificate and RSA key ***"); + Log_warn("*** This is not secure! Please use a CA-signed certificate or create a self-signed certificate ***"); + initTestKey(); + } + else + initKey(); havege_init(&hs); + +#ifdef POLARSSL_VERSION_MAJOR + version_get_string(verstring); + Log_info("PolarSSL library version %s initialized", verstring); +#else Log_info("PolarSSL library initialized"); +#endif } void SSLi_deinit(void) @@ -144,6 +170,22 @@ void SSLi_deinit(void) rsa_free(&key); } +/* Create SHA1 of last certificate in the peer's chain. */ +bool_t SSLi_getSHA1Hash(SSL_handle_t *ssl, uint8_t *hash) +{ + x509_cert *cert; +#ifdef POLARSSL_API_V1_2 + cert = ssl_get_peer_cert(ssl); +#else + cert = ssl->peer_cert; +#endif + if (!cert) { + return false; + } + sha1(cert->raw.p, cert->raw.len, hash); + return true; +} + SSL_handle_t *SSLi_newconnection(int *fd, bool_t *SSLready) { ssl_context *ssl; @@ -162,18 +204,27 @@ SSL_handle_t *SSLi_newconnection(int *fd, bool_t *SSLready) Log_fatal("Failed to initalize: %d", rc); ssl_set_endpoint(ssl, SSL_IS_SERVER); - ssl_set_authmode(ssl, SSL_VERIFY_OPTIONAL); + ssl_set_authmode(ssl, SSL_VERIFY_OPTIONAL); - ssl_set_rng(ssl, havege_rand, &hs); - ssl_set_dbg(ssl, pssl_debug, NULL); - ssl_set_bio(ssl, net_recv, fd, net_send, fd); + ssl_set_rng(ssl, HAVEGE_RAND, &hs); + ssl_set_dbg(ssl, pssl_debug, NULL); + ssl_set_bio(ssl, net_recv, fd, net_send, fd); - ssl_set_ciphers(ssl, ciphers); - ssl_set_session(ssl, 0, 0, ssn); +#ifdef POLARSSL_API_V1 + ssl_set_ciphersuites(ssl, ciphers); +#else + ssl_set_ciphers(ssl, ciphers); +#endif - ssl_set_ca_chain(ssl, certificate.next, NULL, NULL); - ssl_set_own_cert(ssl, &certificate, &key); - ssl_set_dh_param(ssl, my_dhm_P, my_dhm_G); +#ifdef POLARSSL_API_V1_2 + ssl_set_session(ssl, ssn); +#else + ssl_set_session(ssl, 0, 0, ssn); +#endif + + ssl_set_ca_chain(ssl, &certificate, NULL, NULL); + ssl_set_own_cert(ssl, &certificate, &key); + ssl_set_dh_param(ssl, my_dhm_P, my_dhm_G); return ssl; } @@ -184,8 +235,14 @@ int SSLi_nonblockaccept(SSL_handle_t *ssl, bool_t *SSLready) rc = ssl_handshake(ssl); if (rc != 0) { +#ifdef POLARSSL_API_V1 + if (rc == POLARSSL_ERR_NET_WANT_READ || rc == POLARSSL_ERR_NET_WANT_WRITE) { +#else if (rc == POLARSSL_ERR_NET_TRY_AGAIN) { +#endif return 0; + } else if (POLARSSL_ERR_X509_CERT_VERIFY_FAILED) { /* Allow this (selfsigned etc) */ + return 0; } else { Log_warn("SSL handshake failed: %d", rc); return -1; @@ -198,8 +255,13 @@ int SSLi_nonblockaccept(SSL_handle_t *ssl, bool_t *SSLready) int SSLi_read(SSL_handle_t *ssl, uint8_t *buf, int len) { int rc; + rc = ssl_read(ssl, buf, len); +#ifdef POLARSSL_API_V1 + if (rc == POLARSSL_ERR_NET_WANT_READ) +#else if (rc == POLARSSL_ERR_NET_TRY_AGAIN) +#endif return SSLI_ERROR_WANT_READ; return rc; } @@ -207,8 +269,13 @@ int SSLi_read(SSL_handle_t *ssl, uint8_t *buf, int len) int SSLi_write(SSL_handle_t *ssl, uint8_t *buf, int len) { int rc; + rc = ssl_write(ssl, buf, len); +#ifdef POLARSSL_API_V1 + if (rc == POLARSSL_ERR_NET_WANT_WRITE) +#else if (rc == POLARSSL_ERR_NET_TRY_AGAIN) +#endif return SSLI_ERROR_WANT_WRITE; return rc; } @@ -230,7 +297,9 @@ void SSLi_shutdown(SSL_handle_t *ssl) void SSLi_free(SSL_handle_t *ssl) { - free(ssl->session); + Log_debug("SSLi_free"); + free(ssl->session); /* XXX - Hmmm. */ + ssl_free(ssl); free(ssl); } @@ -247,6 +316,8 @@ static X509 *x509; static RSA *rsa; static SSL_CTX *context; static EVP_PKEY *pkey; + +static int verify_callback(int preverify_ok, X509_STORE_CTX *ctx); static int SSL_add_ext(X509 * crt, int nid, char *value) { X509_EXTENSION *ex; @@ -450,10 +521,10 @@ void SSLi_init(void) { const SSL_METHOD *method; SSL *ssl; - int i, offset = 0; + int i, offset = 0, cipherstringlen = 0; STACK_OF(SSL_CIPHER) *cipherlist = NULL, *cipherlist_new = NULL; SSL_CIPHER *cipher; - char cipherstring[1024]; + char *cipherstring, tempstring[128]; SSL_library_init(); OpenSSL_add_all_algorithms(); /* load & register all cryptos, etc. */ @@ -486,11 +557,16 @@ void SSLi_init(void) } Log_debug("List of ciphers:"); if (cipherlist_new) { - for ( i = 0; (cipher = sk_SSL_CIPHER_value(cipherlist_new, i)) != NULL; i++) { + for (i = 0; (cipher = sk_SSL_CIPHER_value(cipherlist_new, i)) != NULL; i++) { Log_debug("%s", SSL_CIPHER_get_name(cipher)); - offset += snprintf(cipherstring + offset, 1024 - offset, "%s:", SSL_CIPHER_get_name(cipher)); + cipherstringlen += strlen(SSL_CIPHER_get_name(cipher)) + 1; + } + cipherstring = malloc(cipherstringlen + 1); + if (cipherstring == NULL) + Log_fatal("Out of memory"); + for (i = 0; (cipher = sk_SSL_CIPHER_value(cipherlist_new, i)) != NULL; i++) { + offset += sprintf(cipherstring + offset, "%s:", SSL_CIPHER_get_name(cipher)); } - cipherstring[offset - 1] = '\0'; } if (cipherlist_new) @@ -501,7 +577,11 @@ void SSLi_init(void) if (SSL_CTX_set_cipher_list(context, cipherstring) == 0) Log_fatal("Failed to set cipher list!"); - + + free(cipherstring); + + SSL_CTX_set_verify(context, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE, + verify_callback); SSL_free(ssl); Log_info("OpenSSL library initialized"); @@ -546,6 +626,32 @@ SSL_handle_t *SSLi_newconnection(int *fd, bool_t *SSLready) return ssl; } +/* Create SHA1 of last certificate in the peer's chain. */ +bool_t SSLi_getSHA1Hash(SSL_handle_t *ssl, uint8_t *hash) +{ + X509 *x509; + uint8_t *buf, *p; + int len; + + x509 = SSL_get_peer_certificate(ssl); + if (!x509) { + return false; + } + + len = i2d_X509(x509, NULL); + buf = malloc(len); + if (buf == NULL) { + Log_fatal("malloc"); + } + + p = buf; + i2d_X509(x509, &p); + + SHA1(buf, len, hash); + free(buf); + return true; +} + void SSLi_closeconnection(SSL_handle_t *ssl) { SSL_free(ssl); @@ -581,4 +687,38 @@ void SSLi_free(SSL_handle_t *ssl) SSL_free(ssl); } +static int verify_callback(int preverify_ok, X509_STORE_CTX *ctx) +{ + char buf[256]; + X509 *err_cert; + int err, depth; + SSL *ssl; + + err_cert = X509_STORE_CTX_get_current_cert(ctx); + err = X509_STORE_CTX_get_error(ctx); + depth = X509_STORE_CTX_get_error_depth(ctx); + + ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()); + X509_NAME_oneline(X509_get_subject_name(err_cert), buf, 256); + + if (depth > 5) { + preverify_ok = 0; + err = X509_V_ERR_CERT_CHAIN_TOO_LONG; + X509_STORE_CTX_set_error(ctx, err); + } + if (!preverify_ok) { + Log_warn("SSL: verify error:num=%d:%s:depth=%d:%s\n", err, + X509_verify_cert_error_string(err), depth, buf); + } + /* + * At this point, err contains the last verification error. We can use + * it for something special + */ + if (!preverify_ok && (err == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT)) { + X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf, 256); + Log_warn("issuer= %s", buf); + } + return 1; +} + #endif