X-Git-Url: https://code.citadel.org/?a=blobdiff_plain;f=webcit-ng%2Fssl.c;h=00b283e5a79d8a80b09c6f3331fb07d4a78d460c;hb=HEAD;hp=93c080269c72d30eefab465c1b0b3ed87285c255;hpb=0d2b829009528b4128e35508500b2f07451cefca;p=citadel.git diff --git a/webcit-ng/ssl.c b/webcit-ng/ssl.c deleted file mode 100644 index 93c080269..000000000 --- a/webcit-ng/ssl.c +++ /dev/null @@ -1,216 +0,0 @@ -// -// Functions in this module handle SSL encryption when WebCit is running -// as an HTTPS server. -// -// Copyright (c) 1996-2022 by the citadel.org team -// -// This program is open source software. It runs great on the -// Linux operating system (and probably elsewhere). You can use, -// copy, and run it under the terms of the GNU General Public -// License version 3. -// -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. - -#include "webcit.h" - -SSL_CTX *ssl_ctx; // global SSL context -char key_file[PATH_MAX] = ""; -char cert_file[PATH_MAX] = ""; -char *ssl_cipher_list = DEFAULT_SSL_CIPHER_LIST; - - -// Set the private key and certificate chain for the global SSL Context. -// This is called during initialization, and can be called again later if the certificate changes. -void bind_to_key_and_certificate(void) { - if (IsEmptyStr(key_file)) { - snprintf(key_file, sizeof key_file, "%s/keys/citadel.key", ctdl_dir); - } - if (IsEmptyStr(cert_file)) { - snprintf(cert_file, sizeof key_file, "%s/keys/citadel.cer", ctdl_dir); - } - - syslog(LOG_DEBUG, "crypto: [re]installing key \"%s\" and certificate \"%s\"", key_file, cert_file); - - SSL_CTX_use_certificate_chain_file(ssl_ctx, cert_file); - SSL_CTX_use_PrivateKey_file(ssl_ctx, key_file, SSL_FILETYPE_PEM); - - if ( !SSL_CTX_check_private_key(ssl_ctx) ) { - syslog(LOG_WARNING, "crypto: cannot install certificate: %s", ERR_reason_error_string(ERR_get_error())); - } -} - - -// Initialize ssl engine, load certs and initialize openssl internals -void init_ssl(void) { - const SSL_METHOD *ssl_method; - RSA *rsa = NULL; - X509_REQ *req = NULL; - X509 *cer = NULL; - EVP_PKEY *pk = NULL; - EVP_PKEY *req_pkey = NULL; - X509_NAME *name = NULL; - FILE *fp; - char buf[SIZ]; - int rv = 0; - - // Initialize SSL transport layer - SSL_library_init(); - SSL_load_error_strings(); - ssl_method = SSLv23_server_method(); - if (!(ssl_ctx = SSL_CTX_new(ssl_method))) { - syslog(LOG_WARNING, "SSL_CTX_new failed: %s", ERR_reason_error_string(ERR_get_error())); - return; - } - - syslog(LOG_INFO, "Requesting cipher list: %s", ssl_cipher_list); - if (!(SSL_CTX_set_cipher_list(ssl_ctx, ssl_cipher_list))) { - syslog(LOG_WARNING, "SSL_CTX_set_cipher_list failed: %s", ERR_reason_error_string(ERR_get_error())); - return; - } - - // Now try to bind to the key and certificate. - bind_to_key_and_certificate(); -} - - -// Check the modification time of the key and certificate -- reload if they changed -void update_key_and_cert_if_needed(void) { - static time_t cert_mtime = 0; - struct stat keystat; - struct stat certstat; - - if (stat(key_file, &keystat) != 0) { - syslog(LOG_ERR, "%s: %s", key_file, strerror(errno)); - return; - } - if (stat(cert_file, &certstat) != 0) { - syslog(LOG_ERR, "%s: %s", cert_file, strerror(errno)); - return; - } - - if ((keystat.st_mtime > cert_mtime) || (certstat.st_mtime > cert_mtime)) { - bind_to_key_and_certificate(); - cert_mtime = certstat.st_mtime; - } -} - - -// starts SSL/TLS encryption for the current session. -void starttls(struct client_handle *ch) { - int retval, bits, alg_bits; - - if (!ssl_ctx) { - return; - } - - // Check the modification time of the key and certificate -- reload if they changed - update_key_and_cert_if_needed(); - - if (!(ch->ssl_handle = SSL_new(ssl_ctx))) { - syslog(LOG_WARNING, "SSL_new failed: %s", ERR_reason_error_string(ERR_get_error())); - return; - } - if (!(SSL_set_fd(ch->ssl_handle, ch->sock))) { - syslog(LOG_WARNING, "SSL_set_fd failed: %s", ERR_reason_error_string(ERR_get_error())); - SSL_free(ch->ssl_handle); - return; - } - retval = SSL_accept(ch->ssl_handle); - if (retval < 1) { - syslog(LOG_WARNING, "SSL_accept failed: %s", ERR_reason_error_string(ERR_get_error())); - } - else { - syslog(LOG_INFO, "SSL_accept success"); - } - bits = SSL_CIPHER_get_bits(SSL_get_current_cipher(ch->ssl_handle), &alg_bits); - syslog(LOG_INFO, "SSL/TLS using %s on %s (%d of %d bits)", - SSL_CIPHER_get_name(SSL_get_current_cipher(ch->ssl_handle)), - SSL_CIPHER_get_version(SSL_get_current_cipher(ch->ssl_handle)), bits, alg_bits); - syslog(LOG_INFO, "SSL started"); -} - - -// shuts down the TLS connection -void endtls(struct client_handle *ch) { - syslog(LOG_INFO, "Ending SSL/TLS"); - if (ch->ssl_handle != NULL) { - SSL_shutdown(ch->ssl_handle); - SSL_get_SSL_CTX(ch->ssl_handle); - SSL_free(ch->ssl_handle); - } - ch->ssl_handle = NULL; -} - - -// Send binary data to the client encrypted. -int client_write_ssl(struct client_handle *ch, char *buf, int nbytes) { - int retval; - int nremain; - char junk[1]; - - if (ch->ssl_handle == NULL) - return (-1); - - nremain = nbytes; - while (nremain > 0) { - if (SSL_want_write(ch->ssl_handle)) { - if ((SSL_read(ch->ssl_handle, junk, 0)) < 1) { - syslog(LOG_WARNING, "SSL_read in client_write: %s", ERR_reason_error_string(ERR_get_error())); - } - } - retval = SSL_write(ch->ssl_handle, &buf[nbytes - nremain], nremain); - if (retval < 1) { - long errval; - - errval = SSL_get_error(ch->ssl_handle, retval); - if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE) { - sleep(1); - continue; - } - syslog(LOG_WARNING, "SSL_write: %s", ERR_reason_error_string(ERR_get_error())); - if (retval == -1) { - syslog(LOG_WARNING, "errno is %d", errno); - endtls(ch); - } - return -1; - } - nremain -= retval; - } - return 0; -} - - -// read data from the encrypted layer -int client_read_ssl(struct client_handle *ch, char *buf, int nbytes) { - int bytes_read = 0; - int rlen = 0; - char junk[1]; - - if (ch->ssl_handle == NULL) - return (-1); - - while (bytes_read < nbytes) { - if (SSL_want_read(ch->ssl_handle)) { - if ((SSL_write(ch->ssl_handle, junk, 0)) < 1) { - syslog(LOG_WARNING, "SSL_write in client_read"); - } - } - rlen = SSL_read(ch->ssl_handle, &buf[bytes_read], nbytes - bytes_read); - if (rlen < 1) { - long errval; - errval = SSL_get_error(ch->ssl_handle, rlen); - if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE) { - sleep(1); - continue; - } - syslog(LOG_WARNING, "SSL_read error %ld", errval); - endtls(ch); - return (-1); - } - bytes_read += rlen; - } - return (bytes_read); -}