Citadel Server and WebCit (classic) now both reload the key and cert if the modificat...

[citadel.git] / webcit / crypto.c

diff --git a/webcit/crypto.c b/webcit/crypto.c
index c396e2d0e47a3aaabd20e350a265843bc801acea..d0804beaf1ec9a661d658bc203f70289fb568671 100644 (file)
--- a/webcit/crypto.c
+++ b/webcit/crypto.c
@@ -16,6 +16,8 @@
 
 
 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;
 
 pthread_key_t ThreadSSL;       // Per-thread SSL context
@@ -25,6 +27,27 @@ void shutdown_ssl(void) {
 }
 
 
+// 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;
@@ -57,29 +80,41 @@ void init_ssl(void) {
 
 
        // Now try to bind to the key and certificate.
-       // Note that we use SSL_CTX_use_certificate_chain_file() which allows
-       // the certificate file to contain intermediate certificates.
+       bind_to_key_and_certificate();
+}
 
 
-       char *key_file[PATH_MAX];
-       char *cert_file[PATH_MAX];
-       snprintf(key_file, sizeof key_file, "%s/keys/citadel.key", ctdl_dir);
-       snprintf(cert_file, sizeof key_file, "%s/keys/citadel.cer", ctdl_dir);
+// 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;
 
-       SSL_CTX_use_certificate_chain_file(ssl_ctx, cert_file);
-       SSL_CTX_use_PrivateKey_file(ssl_ctx, key_file, SSL_FILETYPE_PEM);
+       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 ( !SSL_CTX_check_private_key(ssl_ctx) ) {
-               syslog(LOG_WARNING, "crypto: cannot install certificate: %s", ERR_reason_error_string(ERR_get_error()));
+       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.
 int starttls(int sock) {
-       int retval, bits, alg_bits;
        SSL *newssl;
+       int retval, bits, alg_bits;
 
+       // Check the modification time of the key and certificate -- reload if they changed
+       update_key_and_cert_if_needed();
+       
+       // SSL is a thread-specific thing, I think.
        pthread_setspecific(ThreadSSL, NULL);
 
        if (!ssl_ctx) {
@@ -191,7 +226,7 @@ int client_write_ssl(const StrBuf *Buf) {
                                sleeeeeeeeeep(1);
                                continue;
                        }
-                       syslog(LOG_WARNING, "SSL_write got error %ld, ret %d", errval, retval);
+                       syslog(LOG_WARNING, "SSL_write: %s", ERR_reason_error_string(ERR_get_error()));
                        if (retval == -1) {
                                syslog(LOG_WARNING, "errno is %d\n", errno);
                        }
@@ -228,7 +263,7 @@ int client_read_sslbuffer(StrBuf *buf, int timeout) {
                                sleeeeeeeeeep(1);
                                continue;
                        }
-                       syslog(LOG_WARNING, "SSL_read got error %ld", errval);
+                       syslog(LOG_WARNING, "SSL_read in client_read: %s", ERR_reason_error_string(ERR_get_error()));
                        endtls();
                        return (-1);
                }