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authorTodd C. Miller <millert@cvs.openbsd.org>2002-07-24 23:11:15 +0000
committerTodd C. Miller <millert@cvs.openbsd.org>2002-07-24 23:11:15 +0000
commitac9c8f5c6b291b4d5b3486d05195a036e56ed09e (patch)
treebd7bd963b861c72b51b8dcdc12c5c157201f2b8b /libexec/identd/parse.c
parent159c463972d7132ed5a19584959697118e94d115 (diff)
Sanity check snprintf() return values before using them. OK deraadt@
Diffstat (limited to 'libexec/identd/parse.c')
-rw-r--r--libexec/identd/parse.c125
1 files changed, 81 insertions, 44 deletions
diff --git a/libexec/identd/parse.c b/libexec/identd/parse.c
index 811928588a1..bd60e624eb8 100644
--- a/libexec/identd/parse.c
+++ b/libexec/identd/parse.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: parse.c,v 1.33 2002/07/16 10:32:37 deraadt Exp $ */
+/* $OpenBSD: parse.c,v 1.34 2002/07/24 23:11:14 millert Exp $ */
/*
* This program is in the public domain and may be used freely by anyone
@@ -43,10 +43,12 @@ check_noident(char *homedir)
{
char path[MAXPATHLEN];
struct stat st;
+ int n;
if (!homedir)
return 0;
- if (snprintf(path, sizeof path, "%s/.noident", homedir) >= sizeof path)
+ if ((n = snprintf(path, sizeof(path), "%s/.noident", homedir))
+ >= sizeof(path) || n < 0)
return 0;
if (stat(path, &st) == 0)
return 1;
@@ -61,14 +63,15 @@ int
getuserident(char *homedir, char *buf, int len)
{
char path[MAXPATHLEN], *p;
- int fd, nread;
+ int fd, nread, n;
struct stat st;
if (len == 0)
return 0;
if (!homedir)
return 0;
- if (snprintf(path, sizeof path, "%s/.ident", homedir) >= sizeof(path))
+ if ((n = snprintf(path, sizeof path, "%s/.ident", homedir))
+ >= sizeof(path) || n < 0)
return 0;
if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_NOFOLLOW, 0)) < 0)
return 0;
@@ -198,8 +201,10 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
syslog(LOG_NOTICE,
n ? "read from %s: %m" : "read from %s: EOF",
gethost4_addr(faddr));
- n = snprintf(buf, sizeof(buf),
- "%d , %d : ERROR : UNKNOWN-ERROR\r\n", lport, fport);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : ERROR : UNKNOWN-ERROR\r\n", lport, fport))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -223,8 +228,10 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
syslog(LOG_NOTICE,
"scanf: invalid-port(s): %d , %d from %s",
lport, fport, gethost4_addr(faddr));
- n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
- lport, fport, unknown_flag ? "UNKNOWN-ERROR" : "INVALID-PORT");
+ if ((n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
+ lport, fport, unknown_flag ? "UNKNOWN-ERROR" :
+ "INVALID-PORT")) >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -247,8 +254,10 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
if (syslog_flag)
syslog(LOG_DEBUG, "Returning: %d , %d : NO-USER",
lport, fport);
- n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
- lport, fport, unknown_flag ? "UNKNOWN-ERROR" : "NO-USER");
+ if ((n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
+ lport, fport, unknown_flag ? "UNKNOWN-ERROR" : "NO-USER"))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -264,9 +273,11 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
syslog(LOG_WARNING,
"getpwuid() could not map uid (%u) to name",
uid);
- n = snprintf(buf, sizeof(buf),
+ if ((n = snprintf(buf, sizeof(buf),
"%d , %d : USERID : %s%s%s :%u\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, uid);
+ lport, fport, opsys_name, charset_sep, charset_name, uid))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -283,8 +294,10 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
syslog(LOG_NOTICE,
"user %s requested HIDDEN-USER for host %s: %d, %d",
pw->pw_name, gethost4_addr(faddr), lport, fport);
- n = snprintf(buf, sizeof(buf),
- "%d , %d : ERROR : HIDDEN-USER\r\n", lport, fport);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : ERROR : HIDDEN-USER\r\n", lport, fport))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -295,9 +308,11 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
if (userident_flag && getuserident(pw->pw_dir, token, sizeof token)) {
syslog(LOG_NOTICE, "token \"%s\" == uid %u (%s)",
token, uid, pw->pw_name);
- n = snprintf(buf, sizeof(buf),
- "%d , %d : USERID : %s%s%s :%s\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, token);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : USERID : %s%s%s :%s\r\n", lport, fport,
+ opsys_name, charset_sep, charset_name, token))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -309,9 +324,11 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
gentoken(token, sizeof token);
syslog(LOG_NOTICE, "token %s == uid %u (%s)", token, uid,
pw->pw_name);
- n = snprintf(buf, sizeof(buf),
- "%d , %d : USERID : %s%s%s :%s\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, token);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : USERID : %s%s%s :%s\r\n", lport, fport,
+ opsys_name, charset_sep, charset_name, token))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -320,17 +337,21 @@ parse(int fd, struct in_addr *laddr, struct in_addr *faddr)
}
if (number_flag) {
- n = snprintf(buf, sizeof(buf),
+ if ((n = snprintf(buf, sizeof(buf),
"%d , %d : USERID : %s%s%s :%u\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, uid);
+ lport, fport, opsys_name, charset_sep, charset_name, uid))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
}
return 0;
}
- n = snprintf(buf, sizeof(buf), "%d , %d : USERID : %s%s%s :%s\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, pw->pw_name);
+ if ((n = snprintf(buf, sizeof(buf), "%d , %d : USERID : %s%s%s :%s\r\n",
+ lport, fport, opsys_name, charset_sep, charset_name, pw->pw_name))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost4_addr(faddr));
return 1;
@@ -363,8 +384,10 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
syslog(LOG_NOTICE,
n ? "read from %s: %m" : "read from %s: EOF",
gethost6(faddr));
- n = snprintf(buf, sizeof(buf),
- "%d , %d : ERROR : UNKNOWN-ERROR\r\n", lport, fport);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : ERROR : UNKNOWN-ERROR\r\n", lport, fport))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -388,8 +411,10 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
syslog(LOG_NOTICE,
"scanf: invalid-port(s): %d , %d from %s",
lport, fport, gethost6(faddr));
- n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
- lport, fport, unknown_flag ? "UNKNOWN-ERROR" : "INVALID-PORT");
+ if ((n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
+ lport, fport, unknown_flag ? "UNKNOWN-ERROR" :
+ "INVALID-PORT")) >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -412,8 +437,10 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
if (syslog_flag)
syslog(LOG_DEBUG, "Returning: %d , %d : NO-USER",
lport, fport);
- n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
- lport, fport, unknown_flag ? "UNKNOWN-ERROR" : "NO-USER");
+ if ((n = snprintf(buf, sizeof(buf), "%d , %d : ERROR : %s\r\n",
+ lport, fport, unknown_flag ? "UNKNOWN-ERROR" : "NO-USER"))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -429,9 +456,10 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
syslog(LOG_WARNING,
"getpwuid() could not map uid (%u) to name",
uid);
- n = snprintf(buf, sizeof(buf),
+ if ((n = snprintf(buf, sizeof(buf),
"%d , %d : USERID : %s%s%s :%u\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, uid);
+ lport, fport, opsys_name, charset_sep, charset_name, uid))
+ >= sizeof(buf) || n < 0)
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -448,8 +476,9 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
syslog(LOG_NOTICE,
"user %s requested HIDDEN-USER for host %s: %d, %d",
pw->pw_name, gethost6(faddr), lport, fport);
- n = snprintf(buf, sizeof(buf),
- "%d , %d : ERROR : HIDDEN-USER\r\n", lport, fport);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : ERROR : HIDDEN-USER\r\n", lport, fport))
+ >= sizeof(buf) || n < 0)
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -460,9 +489,11 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
if (userident_flag && getuserident(pw->pw_dir, token, sizeof token)) {
syslog(LOG_NOTICE, "token \"%s\" == uid %u (%s)",
token, uid, pw->pw_name);
- n = snprintf(buf, sizeof(buf),
- "%d , %d : USERID : %s%s%s :%s\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, token);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : USERID : %s%s%s :%s\r\n", lport, fport,
+ opsys_name, charset_sep, charset_name, token))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -474,9 +505,11 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
gentoken(token, sizeof token);
syslog(LOG_NOTICE, "token %s == uid %u (%s)", token, uid,
pw->pw_name);
- n = snprintf(buf, sizeof(buf),
- "%d , %d : USERID : %s%s%s :%s\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, token);
+ if ((n = snprintf(buf, sizeof(buf),
+ "%d , %d : USERID : %s%s%s :%s\r\n", lport, fport,
+ opsys_name, charset_sep, charset_name, token))
+ >= sizeof(buf))
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -485,9 +518,11 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
}
if (number_flag) {
- n = snprintf(buf, sizeof(buf),
+ if ((n = snprintf(buf, sizeof(buf),
"%d , %d : USERID : %s%s%s :%u\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, uid);
+ lport, fport, opsys_name, charset_sep, charset_name, uid))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
@@ -495,8 +530,10 @@ parse6(int fd, struct sockaddr_in6 *laddr, struct sockaddr_in6 *faddr)
return 0;
}
- n = snprintf(buf, sizeof(buf), "%d , %d : USERID : %s%s%s :%s\r\n",
- lport, fport, opsys_name, charset_sep, charset_name, pw->pw_name);
+ if ((n = snprintf(buf, sizeof(buf), "%d , %d : USERID : %s%s%s :%s\r\n",
+ lport, fport, opsys_name, charset_sep, charset_name, pw->pw_name))
+ >= sizeof(buf) || n < 0)
+ n = strlen(buf);
if (timed_write(fd, buf, n, IO_TIMEOUT) != n && syslog_flag) {
syslog(LOG_NOTICE, "write to %s: %m", gethost6(faddr));
return 1;
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