00001
00002
00003
00010 #include "config.h"
00011 #ifdef HAVE_OPENSSL
00012
00013 #include "webcit.h"
00014 #include "webserver.h"
00017 #define CTDL_CRYPTO_DIR "./keys"
00018 #define CTDL_KEY_PATH CTDL_CRYPTO_DIR "/citadel.key"
00019 #define CTDL_CSR_PATH CTDL_CRYPTO_DIR "/citadel.csr"
00020 #define CTDL_CER_PATH CTDL_CRYPTO_DIR "/citadel.cer"
00021 #define SIGN_DAYS 365
00023 SSL_CTX *ssl_ctx;
00024 pthread_mutex_t **SSLCritters;
00026 pthread_key_t ThreadSSL;
00032 static unsigned long id_callback(void)
00033 {
00034 return (unsigned long) pthread_self();
00035 }
00036
00041 void init_ssl(void)
00042 {
00043 SSL_METHOD *ssl_method;
00044 RSA *rsa=NULL;
00045 X509_REQ *req = NULL;
00046 X509 *cer = NULL;
00047 EVP_PKEY *pk = NULL;
00048 EVP_PKEY *req_pkey = NULL;
00049 X509_NAME *name = NULL;
00050 FILE *fp;
00051 char buf[SIZ];
00052
00053 if (!access("/var/run/egd-pool", F_OK))
00054 RAND_egd("/var/run/egd-pool");
00055
00056 if (!RAND_status()) {
00057 lprintf(3,
00058 "PRNG not adequately seeded, won't do SSL/TLS\n");
00059 return;
00060 }
00061 SSLCritters =
00062 malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t *));
00063 if (!SSLCritters) {
00064 lprintf(1, "citserver: can't allocate memory!!\n");
00065
00066 exit(WC_EXIT_SSL);
00067 } else {
00068 int a;
00069
00070 for (a = 0; a < CRYPTO_num_locks(); a++) {
00071 SSLCritters[a] = malloc(sizeof(pthread_mutex_t));
00072 if (!SSLCritters[a]) {
00073 lprintf(1,
00074 "citserver: can't allocate memory!!\n");
00076 exit(WC_EXIT_SSL);
00077 }
00078 pthread_mutex_init(SSLCritters[a], NULL);
00079 }
00080 }
00081
00085 SSL_library_init();
00086 SSL_load_error_strings();
00087 ssl_method = SSLv23_server_method();
00088 if (!(ssl_ctx = SSL_CTX_new(ssl_method))) {
00089 lprintf(3, "SSL_CTX_new failed: %s\n",
00090 ERR_reason_error_string(ERR_get_error()));
00091 return;
00092 }
00093
00094 CRYPTO_set_locking_callback(ssl_lock);
00095 CRYPTO_set_id_callback(id_callback);
00096
00101 mkdir(CTDL_CRYPTO_DIR, 0700);
00102
00111 if (!strcasecmp(ctdlhost, "uds")) {
00112 sprintf(buf, "%s/keys/citadel.key", ctdlport);
00113 symlink(buf, CTDL_KEY_PATH);
00114 sprintf(buf, "%s/keys/citadel.csr", ctdlport);
00115 symlink(buf, CTDL_CSR_PATH);
00116 sprintf(buf, "%s/keys/citadel.cer", ctdlport);
00117 symlink(buf, CTDL_CER_PATH);
00118 }
00119
00123 if (access(CTDL_KEY_PATH, R_OK) != 0) {
00124 lprintf(5, "Generating RSA key pair.\n");
00125 rsa = RSA_generate_key(1024,
00126 65537,
00127 NULL,
00128 NULL);
00129 if (rsa == NULL) {
00130 lprintf(3, "Key generation failed: %s\n",
00131 ERR_reason_error_string(ERR_get_error()));
00132 }
00133 if (rsa != NULL) {
00134 fp = fopen(CTDL_KEY_PATH, "w");
00135 if (fp != NULL) {
00136 chmod(CTDL_KEY_PATH, 0600);
00137 if (PEM_write_RSAPrivateKey(fp,
00138 rsa,
00139 NULL,
00140 NULL,
00141 0,
00142 NULL,
00143 NULL
00144 ) != 1) {
00145 lprintf(3, "Cannot write key: %s\n",
00146 ERR_reason_error_string(ERR_get_error()));
00147 unlink(CTDL_KEY_PATH);
00148 }
00149 fclose(fp);
00150 }
00151 RSA_free(rsa);
00152 }
00153 }
00154
00158 if (access(CTDL_CSR_PATH, R_OK) != 0) {
00159 lprintf(5, "Generating a certificate signing request.\n");
00160
00167 fp = fopen(CTDL_KEY_PATH, "r");
00168 if (fp) {
00169 rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
00170 fclose(fp);
00171 }
00172
00173 if (rsa) {
00174
00176 if (pk=EVP_PKEY_new(), pk != NULL) {
00177 EVP_PKEY_assign_RSA(pk, rsa);
00178 if (req = X509_REQ_new(), req != NULL) {
00179
00181 X509_REQ_set_pubkey(req, pk);
00182 X509_REQ_set_version(req, 0L);
00183
00184 name = X509_REQ_get_subject_name(req);
00185
00188
00189
00190
00191
00192
00193
00194
00195
00196
00197
00198
00199 X509_NAME_add_entry_by_txt(name, "O",
00200 MBSTRING_ASC, "Organization name", -1, -1, 0);
00201
00202 X509_NAME_add_entry_by_txt(name, "OU",
00203 MBSTRING_ASC, "Citadel server", -1, -1, 0);
00204
00205 X509_NAME_add_entry_by_txt(name, "CN",
00206 MBSTRING_ASC, "*", -1, -1, 0);
00207
00208 X509_REQ_set_subject_name(req, name);
00209
00211 if (!X509_REQ_sign(req, pk, EVP_md5())) {
00212 lprintf(3, "X509_REQ_sign(): error\n");
00213 }
00214 else {
00216 fp = fopen(CTDL_CSR_PATH, "w");
00217 if (fp != NULL) {
00218 chmod(CTDL_CSR_PATH, 0600);
00219 PEM_write_X509_REQ(fp, req);
00220 fclose(fp);
00221 }
00222 }
00223
00224 X509_REQ_free(req);
00225 }
00226 }
00227
00228 RSA_free(rsa);
00229 }
00230
00231 else {
00232 lprintf(3, "Unable to read private key.\n");
00233 }
00234 }
00235
00236
00237
00241 if (access(CTDL_CER_PATH, R_OK) != 0) {
00242 lprintf(5, "Generating a self-signed certificate.\n");
00243
00247 fp = fopen(CTDL_KEY_PATH, "r");
00248 if (fp) {
00249 rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
00250 fclose(fp);
00251 }
00252
00254 req = NULL;
00255 cer = NULL;
00256 pk = NULL;
00257 if (rsa) {
00258 if (pk=EVP_PKEY_new(), pk != NULL) {
00259 EVP_PKEY_assign_RSA(pk, rsa);
00260 }
00261
00262 fp = fopen(CTDL_CSR_PATH, "r");
00263 if (fp) {
00264 req = PEM_read_X509_REQ(fp, NULL, NULL, NULL);
00265 fclose(fp);
00266 }
00267
00268 if (req) {
00269 if (cer = X509_new(), cer != NULL) {
00270
00271 ASN1_INTEGER_set(X509_get_serialNumber(cer), 0);
00272 X509_set_issuer_name(cer, req->req_info->subject);
00273 X509_set_subject_name(cer, req->req_info->subject);
00274 X509_gmtime_adj(X509_get_notBefore(cer), 0);
00275 X509_gmtime_adj(X509_get_notAfter(cer),(long)60*60*24*SIGN_DAYS);
00276
00277 req_pkey = X509_REQ_get_pubkey(req);
00278 X509_set_pubkey(cer, req_pkey);
00279 EVP_PKEY_free(req_pkey);
00280
00282 if (!X509_sign(cer, pk, EVP_md5())) {
00283 lprintf(3, "X509_sign(): error\n");
00284 }
00285 else {
00287 fp = fopen(CTDL_CER_PATH, "w");
00288 if (fp != NULL) {
00289 chmod(CTDL_CER_PATH, 0600);
00290 PEM_write_X509(fp, cer);
00291 fclose(fp);
00292 }
00293 }
00294 X509_free(cer);
00295 }
00296 }
00297
00298 RSA_free(rsa);
00299 }
00300 }
00301
00307 SSL_CTX_use_certificate_chain_file(ssl_ctx, CTDL_CER_PATH);
00308 SSL_CTX_use_PrivateKey_file(ssl_ctx, CTDL_KEY_PATH, SSL_FILETYPE_PEM);
00309 if ( !SSL_CTX_check_private_key(ssl_ctx) ) {
00310 lprintf(3, "Cannot install certificate: %s\n",
00311 ERR_reason_error_string(ERR_get_error()));
00312 }
00313
00314 }
00315
00316
00322 int starttls(int sock) {
00323 int retval, bits, alg_bits;
00324 SSL *newssl;
00325
00326 pthread_setspecific(ThreadSSL, NULL);
00327
00328 if (!ssl_ctx) {
00329 return(1);
00330 }
00331 if (!(newssl = SSL_new(ssl_ctx))) {
00332 lprintf(3, "SSL_new failed: %s\n",
00333 ERR_reason_error_string(ERR_get_error()));
00334 return(2);
00335 }
00336 if (!(SSL_set_fd(newssl, sock))) {
00337 lprintf(3, "SSL_set_fd failed: %s\n",
00338 ERR_reason_error_string(ERR_get_error()));
00339 SSL_free(newssl);
00340 return(3);
00341 }
00342 retval = SSL_accept(newssl);
00343 if (retval < 1) {
00349 long errval;
00350
00351 errval = SSL_get_error(newssl, retval);
00352 lprintf(3, "SSL_accept failed: %s\n",
00353 ERR_reason_error_string(ERR_get_error()));
00354 SSL_free(newssl);
00355 newssl = NULL;
00356 return(4);
00357 }
00358 BIO_set_close(newssl->rbio, BIO_NOCLOSE);
00359 bits =
00360 SSL_CIPHER_get_bits(SSL_get_current_cipher(newssl),
00361 &alg_bits);
00362 lprintf(5, "SSL/TLS using %s on %s (%d of %d bits)\n",
00363 SSL_CIPHER_get_name(SSL_get_current_cipher(newssl)),
00364 SSL_CIPHER_get_version(SSL_get_current_cipher(newssl)),
00365 bits, alg_bits);
00366
00367 pthread_setspecific(ThreadSSL, newssl);
00368 return(0);
00369 }
00370
00371
00372
00379 void endtls(void)
00380 {
00381 SSL_CTX *ctx = NULL;
00382
00383 if (THREADSSL == NULL) return;
00384
00385 lprintf(5, "Ending SSL/TLS\n");
00386 SSL_shutdown(THREADSSL);
00387 ctx = SSL_get_SSL_CTX(THREADSSL);
00388
00397 SSL_free(THREADSSL);
00398 pthread_setspecific(ThreadSSL, NULL);
00399 }
00400
00401
00409 void ssl_lock(int mode, int n, const char *file, int line)
00410 {
00411 if (mode & CRYPTO_LOCK)
00412 pthread_mutex_lock(SSLCritters[n]);
00413 else
00414 pthread_mutex_unlock(SSLCritters[n]);
00415 }
00416
00422 void client_write_ssl(char *buf, int nbytes)
00423 {
00424 int retval;
00425 int nremain;
00426 char junk[1];
00427
00428 if (THREADSSL == NULL) return;
00429
00430 nremain = nbytes;
00431
00432 while (nremain > 0) {
00433 if (SSL_want_write(THREADSSL)) {
00434 if ((SSL_read(THREADSSL, junk, 0)) < 1) {
00435 lprintf(9, "SSL_read in client_write: %s\n",
00436 ERR_reason_error_string(ERR_get_error()));
00437 }
00438 }
00439 retval = SSL_write(THREADSSL, &buf[nbytes - nremain], nremain);
00440 if (retval < 1) {
00441 long errval;
00442
00443 errval = SSL_get_error(THREADSSL, retval);
00444 if (errval == SSL_ERROR_WANT_READ ||
00445 errval == SSL_ERROR_WANT_WRITE) {
00446 sleep(1);
00447 continue;
00448 }
00449 lprintf(9, "SSL_write got error %ld, ret %d\n", errval, retval);
00450 if (retval == -1) {
00451 lprintf(9, "errno is %d\n", errno);
00452 }
00453 endtls();
00454 return;
00455 }
00456 nremain -= retval;
00457 }
00458 }
00459
00460
00468 int client_read_ssl(char *buf, int bytes, int timeout)
00469 {
00470 #if 0
00471 fd_set rfds;
00472 struct timeval tv;
00473 int retval;
00474 int s;
00475 #endif
00476 int len, rlen;
00477 char junk[1];
00478
00479 if (THREADSSL == NULL) return(0);
00480
00481 len = 0;
00482 while (len < bytes) {
00483 #if 0
00484
00488 FD_ZERO(&rfds);
00489 s = BIO_get_fd(THREADSSL->rbio, NULL);
00490 FD_SET(s, &rfds);
00491 tv.tv_sec = timeout;
00492 tv.tv_usec = 0;
00493
00494 retval = select(s + 1, &rfds, NULL, NULL, &tv);
00495
00496 if (FD_ISSET(s, &rfds) == 0) {
00497 return (0);
00498 }
00499
00500 #endif
00501 if (SSL_want_read(THREADSSL)) {
00502 if ((SSL_write(THREADSSL, junk, 0)) < 1) {
00503 lprintf(9, "SSL_write in client_read: %s\n", ERR_reason_error_string(ERR_get_error()));
00504 }
00505 }
00506 rlen = SSL_read(THREADSSL, &buf[len], bytes - len);
00507 if (rlen < 1) {
00508 long errval;
00509
00510 errval = SSL_get_error(THREADSSL, rlen);
00511 if (errval == SSL_ERROR_WANT_READ ||
00512 errval == SSL_ERROR_WANT_WRITE) {
00513 sleep(1);
00514 continue;
00515 }
00516 lprintf(9, "SSL_read got error %ld\n", errval);
00517 endtls();
00518 return (0);
00519 }
00520 len += rlen;
00521 }
00522 return (1);
00523 }
00524
00525
00526 #endif
00527