MFC src/contrib/telnet/telnet.c 1.16: Correct buffer overflows in

telnet(1).
Security: CAN-2005-0468, CAN-2005-0469
Approved by:	security-officer

3 files changed, 72 insertions, 18 deletions

diff --git a/crypto/heimdal/appl/telnet/telnet/telnet.c b/crypto/heimdal/appl/telnet/telnet/telnet.c
index bbc99990e201..8ea82d6494ba 100644
--- a/crypto/heimdal/appl/telnet/telnet/telnet.c
+++ b/crypto/heimdal/appl/telnet/telnet/telnet.c
@@ -1294,6 +1294,7 @@ slc_check()
 
 
 unsigned char slc_reply[128];
+unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
 unsigned char *slc_replyp;
 
 void
@@ -1309,6 +1310,14 @@ slc_start_reply()
 void
 slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
 {
+	/* A sequence of up to 6 bytes my be written for this member of the SLC
+	 * suboption list by this function.  The end of negotiation command,
+	 * which is written by slc_end_reply(), will require 2 additional
+	 * bytes.  Do not proceed unless there is sufficient space for these
+	 * items.
+	 */
+	if (&slc_replyp[6+2] > slc_reply_eom)
+		return;
 	if ((*slc_replyp++ = func) == IAC)
 		*slc_replyp++ = IAC;
 	if ((*slc_replyp++ = flags) == IAC)
@@ -1322,6 +1331,9 @@ slc_end_reply()
 {
     int len;
 
+    /* The end of negotiation command requires 2 bytes. */
+    if (&slc_replyp[2] > slc_reply_eom)
+            return;
     *slc_replyp++ = IAC;
     *slc_replyp++ = SE;
     len = slc_replyp - slc_reply;
@@ -1415,8 +1427,8 @@ env_opt(unsigned char *buf, int len)
 	}
 }
 
-#define	OPT_REPLY_SIZE	256
-unsigned char *opt_reply;
+#define	OPT_REPLY_SIZE	(2 * SUBBUFSIZE)
+unsigned char *opt_reply = NULL;
 unsigned char *opt_replyp;
 unsigned char *opt_replyend;
 
@@ -1475,9 +1487,9 @@ env_opt_add(unsigned char *ep)
 		return;
 	}
 	vp = env_getvalue(ep);
-	if (opt_replyp + (vp ? strlen((char *)vp) : 0) +
-				strlen((char *)ep) + 6 > opt_replyend)
-	{
+        if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
+                                2 * strlen((char *)ep) + 6 > opt_replyend)
+        {
 		int len;
 		void *tmp;
 		opt_replyend += OPT_REPLY_SIZE;
@@ -1503,6 +1515,8 @@ env_opt_add(unsigned char *ep)
 		*opt_replyp++ = ENV_USERVAR;
 	for (;;) {
 		while ((c = *ep++)) {
+			if (opt_replyp + (2 + 2) > opt_replyend)
+				return;
 			switch(c&0xff) {
 			case IAC:
 				*opt_replyp++ = IAC;
@@ -1517,6 +1531,8 @@ env_opt_add(unsigned char *ep)
 			*opt_replyp++ = c;
 		}
 		if ((ep = vp)) {
+			if (opt_replyp + (1 + 2 + 2) > opt_replyend)
+				return;
 #ifdef	OLD_ENVIRON
 			if (telopt_environ == TELOPT_OLD_ENVIRON)
 				*opt_replyp++ = old_env_value;
@@ -1547,7 +1563,9 @@ env_opt_end(int emptyok)
 {
 	int len;
 
-	len = opt_replyp - opt_reply + 2;
+	if (opt_replyp + 2 > opt_replyend)
+		return;
+	len = opt_replyp + 2 - opt_reply;
 	if (emptyok || len > 6) {
 		*opt_replyp++ = IAC;
 		*opt_replyp++ = SE;
diff --git a/crypto/kerberosIV/appl/telnet/telnet/telnet.c b/crypto/kerberosIV/appl/telnet/telnet/telnet.c
index 1df4d6ea35b2..0275357025ed 100644
--- a/crypto/kerberosIV/appl/telnet/telnet/telnet.c
+++ b/crypto/kerberosIV/appl/telnet/telnet/telnet.c
@@ -1285,6 +1285,7 @@ slc_check()
 
 
 unsigned char slc_reply[128];
+unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
 unsigned char *slc_replyp;
 
 void
@@ -1300,6 +1301,14 @@ slc_start_reply()
 void
 slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
 {
+	/* A sequence of up to 6 bytes my be written for this member of the SLC
+	 * suboption list by this function.  The end of negotiation command,
+	 * which is written by slc_end_reply(), will require 2 additional
+	 * bytes.  Do not proceed unless there is sufficient space for these
+	 * items.
+	 */
+	if (&slc_replyp[6+2] > slc_reply_eom)
+		return;
 	if ((*slc_replyp++ = func) == IAC)
 		*slc_replyp++ = IAC;
 	if ((*slc_replyp++ = flags) == IAC)
@@ -1313,6 +1322,9 @@ slc_end_reply()
 {
     int len;
 
+    /* The end of negotiation command requires 2 bytes. */
+    if (&slc_replyp[2] > slc_reply_eom)
+            return;
     *slc_replyp++ = IAC;
     *slc_replyp++ = SE;
     len = slc_replyp - slc_reply;
@@ -1406,8 +1418,8 @@ env_opt(unsigned char *buf, int len)
 	}
 }
 
-#define	OPT_REPLY_SIZE	256
-unsigned char *opt_reply;
+#define	OPT_REPLY_SIZE	(2 * SUBBUFSIZE)
+unsigned char *opt_reply = NULL;
 unsigned char *opt_replyp;
 unsigned char *opt_replyend;
 
@@ -1460,9 +1472,9 @@ env_opt_add(unsigned char *ep)
 		return;
 	}
 	vp = env_getvalue(ep);
-	if (opt_replyp + (vp ? strlen((char *)vp) : 0) +
-				strlen((char *)ep) + 6 > opt_replyend)
-	{
+        if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
+                                2 * strlen((char *)ep) + 6 > opt_replyend)
+        {
 		int len;
 		opt_replyend += OPT_REPLY_SIZE;
 		len = opt_replyend - opt_reply;
@@ -1486,6 +1498,8 @@ env_opt_add(unsigned char *ep)
 		*opt_replyp++ = ENV_USERVAR;
 	for (;;) {
 		while ((c = *ep++)) {
+			if (opt_replyp + (2 + 2) > opt_replyend)
+				return;
 			switch(c&0xff) {
 			case IAC:
 				*opt_replyp++ = IAC;
@@ -1500,6 +1514,8 @@ env_opt_add(unsigned char *ep)
 			*opt_replyp++ = c;
 		}
 		if ((ep = vp)) {
+			if (opt_replyp + (1 + 2 + 2) > opt_replyend)
+				return;
 #ifdef	OLD_ENVIRON
 			if (telopt_environ == TELOPT_OLD_ENVIRON)
 				*opt_replyp++ = old_env_value;
@@ -1530,7 +1546,9 @@ env_opt_end(int emptyok)
 {
 	int len;
 
-	len = opt_replyp - opt_reply + 2;
+	if (opt_replyp + 2 > opt_replyend)
+		return;
+	len = opt_replyp + 2 - opt_reply;
 	if (emptyok || len > 6) {
 		*opt_replyp++ = IAC;
 		*opt_replyp++ = SE;
diff --git a/crypto/telnet/telnet/telnet.c b/crypto/telnet/telnet/telnet.c
index 4644531376fa..c9f58ebcbe9a 100644
--- a/crypto/telnet/telnet/telnet.c
+++ b/crypto/telnet/telnet/telnet.c
@@ -1318,6 +1318,7 @@ slc_check(void)
 }
 
 unsigned char slc_reply[128];
+unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
 unsigned char *slc_replyp;
 
 void
@@ -1333,6 +1334,14 @@ slc_start_reply(void)
 void
 slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
 {
+	/* A sequence of up to 6 bytes my be written for this member of the SLC
+	 * suboption list by this function.  The end of negotiation command,
+	 * which is written by slc_end_reply(), will require 2 additional
+	 * bytes.  Do not proceed unless there is sufficient space for these
+	 * items.
+	 */
+	if (&slc_replyp[6+2] > slc_reply_eom)
+		return;
 	if ((*slc_replyp++ = func) == IAC)
 		*slc_replyp++ = IAC;
 	if ((*slc_replyp++ = flags) == IAC)
@@ -1346,6 +1355,9 @@ slc_end_reply(void)
 {
     int len;
 
+    /* The end of negotiation command requires 2 bytes. */
+    if (&slc_replyp[2] > slc_reply_eom)
+            return;
     *slc_replyp++ = IAC;
     *slc_replyp++ = SE;
     len = slc_replyp - slc_reply;
@@ -1463,8 +1475,8 @@ env_opt(unsigned char *buf, int len)
 	}
 }
 
-#define	OPT_REPLY_SIZE	256
-unsigned char *opt_reply;
+#define	OPT_REPLY_SIZE	(2 * SUBBUFSIZE)
+unsigned char *opt_reply = NULL;
 unsigned char *opt_replyp;
 unsigned char *opt_replyend;
 
@@ -1517,9 +1529,9 @@ env_opt_add(unsigned char *ep)
 		return;
 	}
 	vp = env_getvalue(ep);
-	if (opt_replyp + (vp ? strlen((char *)vp) : 0) +
-				strlen((char *)ep) + 6 > opt_replyend)
-	{
+        if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
+                                2 * strlen((char *)ep) + 6 > opt_replyend)
+        {
 		int len;
 		opt_replyend += OPT_REPLY_SIZE;
 		len = opt_replyend - opt_reply;
@@ -1543,6 +1555,8 @@ env_opt_add(unsigned char *ep)
 		*opt_replyp++ = ENV_USERVAR;
 	for (;;) {
 		while ((c = *ep++)) {
+			if (opt_replyp + (2 + 2) > opt_replyend)
+				return;
 			switch(c&0xff) {
 			case IAC:
 				*opt_replyp++ = IAC;
@@ -1557,6 +1571,8 @@ env_opt_add(unsigned char *ep)
 			*opt_replyp++ = c;
 		}
 		if ((ep = vp)) {
+			if (opt_replyp + (1 + 2 + 2) > opt_replyend)
+				return;
 #ifdef	OLD_ENVIRON
 			if (telopt_environ == TELOPT_OLD_ENVIRON)
 				*opt_replyp++ = old_env_value;
@@ -1587,7 +1603,9 @@ env_opt_end(int emptyok)
 {
 	int len;
 
-	len = opt_replyp - opt_reply + 2;
+	if (opt_replyp + 2 > opt_replyend)
+		return;
+	len = opt_replyp + 2 - opt_reply;
 	if (emptyok || len > 6) {
 		*opt_replyp++ = IAC;
 		*opt_replyp++ = SE;