[svn-commits] trunk r32401 - in /trunk: ./ channels/chan_iax2.c
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svn-commits at lists.digium.com
Mon Jun 5 13:10:07 MST 2006
Author: kpfleming
Date: Mon Jun 5 15:10:06 2006
New Revision: 32401
URL: http://svn.digium.com/view/asterisk?rev=32401&view=rev
Log:
Merged revisions 32373 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.2
........
r32373 | kpfleming | 2006-06-05 14:53:16 -0500 (Mon, 05 Jun 2006) | 2 lines
ensure that the received number of bytes is included in all IAX2 incoming frame analysis checks (fixes a known vulnerability)
........
Modified:
trunk/ (props changed)
trunk/channels/chan_iax2.c
Propchange: trunk/
------------------------------------------------------------------------------
Binary property 'branch-1.2-merged' - no diff available.
Modified: trunk/channels/chan_iax2.c
URL: http://svn.digium.com/view/asterisk/trunk/channels/chan_iax2.c?rev=32401&r1=32400&r2=32401&view=diff
==============================================================================
--- trunk/channels/chan_iax2.c (original)
+++ trunk/channels/chan_iax2.c Mon Jun 5 15:10:06 2006
@@ -6314,27 +6314,28 @@
fd = thread->iofd;
memcpy(&sin, &thread->iosin, sizeof(sin));
- if (res < sizeof(struct ast_iax2_mini_hdr)) {
- ast_log(LOG_WARNING, "midget packet received (%d of %d min)\n", res, (int)sizeof(struct ast_iax2_mini_hdr));
+ if (res < sizeof(*mh)) {
+ ast_log(LOG_WARNING, "midget packet received (%d of %zd min)\n", res, sizeof(*mh));
return 1;
}
- if ((vh->zeros == 0) && (ntohs(vh->callno) & 0x8000)) {
+ if ((res >= sizeof(*vh)) && ((vh->zeros == 0) && (ntohs(vh->callno) & 0x8000))) {
/* This is a video frame, get call number */
fr->callno = find_callno(ntohs(vh->callno) & ~0x8000, dcallno, &sin, new, 1, fd);
minivid = 1;
- } else if (meta->zeros == 0) {
+ } else if ((res >= sizeof(*meta)) && (meta->zeros == 0) && !(ntohs(meta->metacmd) & 0x8000)) {
unsigned char metatype;
/* This is a meta header */
switch(meta->metacmd) {
case IAX_META_TRUNK:
- if (res < sizeof(struct ast_iax2_meta_hdr) + sizeof(struct ast_iax2_meta_trunk_hdr)) {
- ast_log(LOG_WARNING, "midget meta trunk packet received (%d of %d min)\n", res, (int)sizeof(struct ast_iax2_mini_hdr));
+ if (res < (sizeof(*meta) + sizeof(*mth))) {
+ ast_log(LOG_WARNING, "midget meta trunk packet received (%d of %zd min)\n", res,
+ sizeof(*meta) + sizeof(*mth));
return 1;
}
mth = (struct ast_iax2_meta_trunk_hdr *)(meta->data);
ts = ntohl(mth->ts);
metatype = meta->cmddata;
- res -= (sizeof(struct ast_iax2_meta_hdr) + sizeof(struct ast_iax2_meta_trunk_hdr));
+ res -= (sizeof(*meta) + sizeof(*mth));
ptr = mth->data;
tpeer = find_tpeer(&sin, fd);
if (!tpeer) {
@@ -6346,21 +6347,21 @@
tpeer->rxtrunktime = tpeer->trunkact;
rxtrunktime = tpeer->rxtrunktime;
ast_mutex_unlock(&tpeer->lock);
- while(res >= sizeof(struct ast_iax2_meta_trunk_entry)) {
+ while(res >= sizeof(*mte)) {
/* Process channels */
unsigned short callno, trunked_ts, len;
- if(metatype == IAX_META_TRUNK_MINI) {
+ if (metatype == IAX_META_TRUNK_MINI) {
mtm = (struct ast_iax2_meta_trunk_mini *)ptr;
- ptr += sizeof(struct ast_iax2_meta_trunk_mini);
- res -= sizeof(struct ast_iax2_meta_trunk_mini);
+ ptr += sizeof(*mtm);
+ res -= sizeof(*mtm);
len = ntohs(mtm->len);
callno = ntohs(mtm->mini.callno);
trunked_ts = ntohs(mtm->mini.ts);
- } else if ( metatype == IAX_META_TRUNK_SUPERMINI ) {
+ } else if (metatype == IAX_META_TRUNK_SUPERMINI) {
mte = (struct ast_iax2_meta_trunk_entry *)ptr;
- ptr += sizeof(struct ast_iax2_meta_trunk_entry);
- res -= sizeof(struct ast_iax2_meta_trunk_entry);
+ ptr += sizeof(*mte);
+ res -= sizeof(*mte);
len = ntohs(mte->len);
callno = ntohs(mte->callno);
trunked_ts = 0;
@@ -6443,11 +6444,21 @@
}
return 1;
}
+
+ /* if we got here and ->zeros contains zeros, this cannot be a valid
+ miniframe or full frame but it wasn't a valid video frame or meta
+ frame either, so we reject it
+ */
+ if (vh->zeros == 0) {
+ ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a video or meta frame but is not properly formatted\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
+ return 1;
+ }
+
#ifdef DEBUG_SUPPORT
- if (iaxdebug)
- iax_showframe(NULL, fh, 1, &sin, res - sizeof(struct ast_iax2_full_hdr));
+ if (iaxdebug && (res >= sizeof(*fh)))
+ iax_showframe(NULL, fh, 1, &sin, res - sizeof(*fh));
#endif
- if (ntohs(mh->callno) & IAX_FLAG_FULL) {
+ if ((res >= sizeof(*fh)) && ntohs(mh->callno) & IAX_FLAG_FULL) {
/* Get the destination call number */
dcallno = ntohs(fh->dcallno) & ~IAX_FLAG_RETRANS;
/* Retrieve the type and subclass */
@@ -6498,7 +6509,7 @@
}
#ifdef DEBUG_SUPPORT
else if (iaxdebug)
- iax_showframe(NULL, fh, 3, &sin, res - sizeof(struct ast_iax2_full_hdr));
+ iax_showframe(NULL, fh, 3, &sin, res - sizeof(*fh));
#endif
}
@@ -6583,12 +6594,12 @@
iaxs[fr->callno]->iseqno++;
}
/* A full frame */
- if (res < sizeof(struct ast_iax2_full_hdr)) {
- ast_log(LOG_WARNING, "midget packet received (%d of %d min)\n", res, (int)sizeof(struct ast_iax2_full_hdr));
+ if (res < sizeof(*fh)) {
+ ast_log(LOG_WARNING, "midget packet received (%d of %zd min)\n", res, sizeof(*fh));
ast_mutex_unlock(&iaxsl[fr->callno]);
return 1;
}
- f.datalen = res - sizeof(struct ast_iax2_full_hdr);
+ f.datalen = res - sizeof(*fh);
/* Handle implicit ACKing unless this is an INVAL, and only if this is
from the real peer, not the transfer peer */
@@ -6646,14 +6657,14 @@
if (f.datalen) {
if (f.frametype == AST_FRAME_IAX) {
- if (iax_parse_ies(&ies, thread->buf + sizeof(struct ast_iax2_full_hdr), f.datalen)) {
+ if (iax_parse_ies(&ies, thread->buf + sizeof(*fh), f.datalen)) {
ast_log(LOG_WARNING, "Undecodable frame received from '%s'\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr));
ast_mutex_unlock(&iaxsl[fr->callno]);
return 1;
}
f.data = NULL;
} else
- f.data = thread->buf + sizeof(struct ast_iax2_full_hdr);
+ f.data = thread->buf + sizeof(*fh);
} else {
if (f.frametype == AST_FRAME_IAX)
f.data = NULL;
@@ -7557,9 +7568,9 @@
ast_mutex_unlock(&iaxsl[fr->callno]);
return 1;
}
- f.datalen = res - sizeof(struct ast_iax2_video_hdr);
+ f.datalen = res - sizeof(*vh);
if (f.datalen)
- f.data = thread->buf + sizeof(struct ast_iax2_video_hdr);
+ f.data = thread->buf + sizeof(*vh);
else
f.data = NULL;
#ifdef IAXTESTS
@@ -7586,7 +7597,7 @@
return 1;
}
if (f.datalen)
- f.data = thread->buf + sizeof(struct ast_iax2_mini_hdr);
+ f.data = thread->buf + sizeof(*mh);
else
f.data = NULL;
#ifdef IAXTESTS
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