chan_sip: Fix handling of "From" headers longer than 256 characters

From headers were processed using a 256 character buffer on the stack.
This change replaces that with a heap allocation by ast_strdup.

ASTERISK-23790 #close
Reported by: uniken1
Tested by: uniken1
Review: https://reviewboard.asterisk.org/r/3669/
Patches:
    chan_sip-large-from-header-1.8-r3.patch uploaded by wdoekes (license 5674)
........

Merged revisions 417248 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 417249 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@417250 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 7a3d93e36c5fdf827e72f4fc5a83000d5436be6a..64f9f027add871bc3c8b5dc6737ae772b443db06 100644 (file)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -17899,7 +17899,8 @@ static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq, char **name, c
 static enum sip_get_dest_result get_destination(struct sip_pvt *p, struct sip_request *oreq, int *cc_recall_core_id)
 {
        char tmp[256] = "", *uri, *unused_password, *domain;
-       char tmpf[256] = "", *from = NULL;
+       RAII_VAR(char *, tmpf, NULL, ast_free);
+       char *from = NULL;
        struct sip_request *req;
        char *decoded_uri;
        RAII_VAR(struct ast_features_pickup_config *, pickup_cfg, ast_get_chan_features_pickup_config(p->owner), ao2_cleanup);
@@ -17950,7 +17951,7 @@ static enum sip_get_dest_result get_destination(struct sip_pvt *p, struct sip_re
        /* XXX Why is this done in get_destination? Isn't it already done?
           Needs to be checked
         */
-       ast_copy_string(tmpf, sip_get_header(req, "From"), sizeof(tmpf));
+       tmpf = ast_strdup(sip_get_header(req, "From"));
        if (!ast_strlen_zero(tmpf)) {
                from = get_in_brackets(tmpf);
                if (parse_uri_legacy_check(from, "sip:,sips:", &from, NULL, &domain, NULL)) {
@@ -18821,19 +18822,21 @@ static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_requ
                                              int sipmethod, const char *uri, enum xmittype reliable,
                                              struct ast_sockaddr *addr, struct sip_peer **authpeer)
 {
-       char from[256], *of, *name, *unused_password, *domain;
+       char *of, *name, *unused_password, *domain;
+       RAII_VAR(char *, ofbuf, NULL, ast_free); /* beware, everyone starts pointing to this */
+       RAII_VAR(char *, namebuf, NULL, ast_free);
        enum check_auth_result res = AUTH_DONT_KNOW;
        char calleridname[256];
        char *uri2 = ast_strdupa(uri);
 
        terminate_uri(uri2);    /* trim extra stuff */
 
-       ast_copy_string(from, sip_get_header(req, "From"), sizeof(from));
+       ofbuf = ast_strdup(sip_get_header(req, "From"));
        /* XXX here tries to map the username for invite things */
 
        /* strip the display-name portion off the beginning of the FROM header. */
-       if (!(of = (char *) get_calleridname(from, calleridname, sizeof(calleridname)))) {
-               ast_log(LOG_ERROR, "FROM header can not be parsed \n");
+       if (!(of = (char *) get_calleridname(ofbuf, calleridname, sizeof(calleridname)))) {
+               ast_log(LOG_ERROR, "FROM header can not be parsed\n");
                return res;
        }
 
@@ -18909,8 +18912,7 @@ static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_requ
                }
 
                if (!ast_strlen_zero(hdr) && (hdr = strstr(hdr, "username=\""))) {
-                       ast_copy_string(from, hdr + strlen("username=\""), sizeof(from));
-                       name = from;
+                       namebuf = name = ast_strdup(hdr + strlen("username=\""));
                        name = strsep(&name, "\"");
                }
        }