tcptls: Use new certificate upon sip reload

Previously, a TLS server socket would only be restarted upon sip reload if the
bind address had changed. This commit adds checking for changes to TLS
parameters like certificate, ciphers, etc. so they get picked up without
requiring a reload of the entire chan_sip module. This does not affect open
connections in any way, but new connections will use the new TLS parameters.
The changes also apply to HTTP and Manager.

ASTERISK-26604 #close

Change-Id: I169e86cefc6dcd627c915134015a6a1ab1aadbe6

diff --git a/include/asterisk/tcptls.h b/include/asterisk/tcptls.h
index 883cb9229ef91c4236dba62f1b364bfda1e37c98..1e3a7524bf8c33ef496f8187d910563ffee74d1c 100644 (file)
--- a/include/asterisk/tcptls.h
+++ b/include/asterisk/tcptls.h
@@ -94,6 +94,9 @@ struct ast_tls_config {
        char *capath;
        struct ast_flags flags;
        SSL_CTX *ssl_ctx;
+       char certhash[41];
+       char pvthash[41];
+       char cahash[41];
 };
 
 /*! \page AstTlsOverview TLS Implementation Overview
@@ -138,6 +141,7 @@ struct ast_tcptls_session_args {
        void (*periodic_fn)(void *);/*!< something we may want to run before after select on the accept socket */
        void *(*worker_fn)(void *); /*!< the function in charge of doing the actual work */
        const char *name;
+       struct ast_tls_config *old_tls_cfg; /*!< copy of the SSL configuration to determine whether changes have been made */
 };
 
 /*! \brief

diff --git a/main/tcptls.c b/main/tcptls.c
index c8ebab43470d31badbe10556a18f936f5cb20dc6..fce1558b7474c521b63387afb5ad27191d6e0643 100644 (file)
--- a/main/tcptls.c
+++ b/main/tcptls.c
@@ -36,6 +36,7 @@
 #endif
 
 #include <signal.h>
+#include <sys/stat.h>
 
 #include "asterisk/compat.h"
 #include "asterisk/tcptls.h"
@@ -46,6 +47,7 @@
 #include "asterisk/manager.h"
 #include "asterisk/astobj2.h"
 #include "asterisk/pbx.h"
+#include "asterisk/app.h"
 
 static void session_instance_destructor(void *obj)
 {
@@ -588,9 +590,64 @@ void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
 {
        int flags;
        int x = 1;
+       int tls_changed = 0;
+
+       if (desc->tls_cfg) {
+               char hash[41];
+               char *str = NULL;
+               struct stat st;
+
+               /* Store the hashes of the TLS certificate etc. */
+               if (stat(desc->tls_cfg->certfile, &st) || NULL == (str = ast_read_textfile(desc->tls_cfg->certfile))) {
+                       memset(hash, 0, 41);
+               } else {
+                       ast_sha1_hash(hash, str);
+               }
+               ast_free(str);
+               str = NULL;
+               memcpy(desc->tls_cfg->certhash, hash, 41);
+               if (stat(desc->tls_cfg->pvtfile, &st) || NULL == (str = ast_read_textfile(desc->tls_cfg->pvtfile))) {
+                       memset(hash, 0, 41);
+               } else {
+                       ast_sha1_hash(hash, str);
+               }
+               ast_free(str);
+               str = NULL;
+               memcpy(desc->tls_cfg->pvthash, hash, 41);
+               if (stat(desc->tls_cfg->cafile, &st) || NULL == (str = ast_read_textfile(desc->tls_cfg->cafile))) {
+                       memset(hash, 0, 41);
+               } else {
+                       ast_sha1_hash(hash, str);
+               }
+               ast_free(str);
+               str = NULL;
+               memcpy(desc->tls_cfg->cahash, hash, 41);
+
+               /* Check whether TLS configuration has changed */
+               if (!desc->old_tls_cfg) { /* No previous configuration */
+                       tls_changed = 1;
+                       desc->old_tls_cfg = ast_calloc(1, sizeof(*desc->old_tls_cfg));
+               } else if (memcmp(desc->tls_cfg->certhash, desc->old_tls_cfg->certhash, 41)) {
+                       tls_changed = 1;
+               } else if (memcmp(desc->tls_cfg->pvthash, desc->old_tls_cfg->pvthash, 41)) {
+                       tls_changed = 1;
+               } else if (strcmp(desc->tls_cfg->cipher, desc->old_tls_cfg->cipher)) {
+                       tls_changed = 1;
+               } else if (memcmp(desc->tls_cfg->cahash, desc->old_tls_cfg->cahash, 41)) {
+                       tls_changed = 1;
+               } else if (strcmp(desc->tls_cfg->capath, desc->old_tls_cfg->capath)) {
+                       tls_changed = 1;
+               } else if (memcmp(&desc->tls_cfg->flags, &desc->old_tls_cfg->flags, sizeof(desc->tls_cfg->flags))) {
+                       tls_changed = 1;
+               }
+
+               if (tls_changed) {
+                       ast_debug(1, "Changed parameters for %s found\n", desc->name);
+               }
+       }
 
        /* Do nothing if nothing has changed */
-       if (!ast_sockaddr_cmp(&desc->old_address, &desc->local_address)) {
+       if (!tls_changed && !ast_sockaddr_cmp(&desc->old_address, &desc->local_address)) {
                ast_debug(1, "Nothing changed in %s\n", desc->name);
                return;
        }
@@ -646,6 +703,22 @@ void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
 
        /* Set current info */
        ast_sockaddr_copy(&desc->old_address, &desc->local_address);
+       if (desc->old_tls_cfg) {
+               ast_free(desc->old_tls_cfg->certfile);
+               ast_free(desc->old_tls_cfg->pvtfile);
+               ast_free(desc->old_tls_cfg->cipher);
+               ast_free(desc->old_tls_cfg->cafile);
+               ast_free(desc->old_tls_cfg->capath);
+               desc->old_tls_cfg->certfile = ast_strdup(desc->tls_cfg->certfile);
+               desc->old_tls_cfg->pvtfile = ast_strdup(desc->tls_cfg->pvtfile);
+               desc->old_tls_cfg->cipher = ast_strdup(desc->tls_cfg->cipher);
+               desc->old_tls_cfg->cafile = ast_strdup(desc->tls_cfg->cafile);
+               desc->old_tls_cfg->capath = ast_strdup(desc->tls_cfg->capath);
+               memcpy(desc->old_tls_cfg->certhash, desc->tls_cfg->certhash, 41);
+               memcpy(desc->old_tls_cfg->pvthash, desc->tls_cfg->pvthash, 41);
+               memcpy(desc->old_tls_cfg->cahash, desc->tls_cfg->cahash, 41);
+               memcpy(&desc->old_tls_cfg->flags, &desc->tls_cfg->flags, sizeof(desc->old_tls_cfg->flags));
+       }
 
        return;
 
@@ -676,6 +749,17 @@ void ast_tcptls_server_stop(struct ast_tcptls_session_args *desc)
                close(desc->accept_fd);
        }
        desc->accept_fd = -1;
+
+       if (desc->old_tls_cfg) {
+               ast_free(desc->old_tls_cfg->certfile);
+               ast_free(desc->old_tls_cfg->pvtfile);
+               ast_free(desc->old_tls_cfg->cipher);
+               ast_free(desc->old_tls_cfg->cafile);
+               ast_free(desc->old_tls_cfg->capath);
+               ast_free(desc->old_tls_cfg);
+               desc->old_tls_cfg = NULL;
+       }
+
        ast_debug(2, "Stopped server :: %s\n", desc->name);
 }