shadow-utils/shadow-4.5-long-entry.patch
Tomas Mraz 4cb5077b68 Raise limit for passwd and shadow entry length
- also prevent writing longer entries (#1422497)
2018-04-20 16:23:31 +02:00

85 lines
3.1 KiB
Diff

diff -up shadow-4.5/lib/defines.h.long-entry shadow-4.5/lib/defines.h
--- shadow-4.5/lib/defines.h.long-entry 2014-09-01 16:36:40.000000000 +0200
+++ shadow-4.5/lib/defines.h 2018-04-20 11:53:07.419308212 +0200
@@ -382,4 +382,7 @@ extern char *strerror ();
# endif
#endif
+/* Maximum length of passwd entry */
+#define PASSWD_ENTRY_MAX_LENGTH 32768
+
#endif /* _DEFINES_H_ */
diff -up shadow-4.5/lib/pwio.c.long-entry shadow-4.5/lib/pwio.c
--- shadow-4.5/lib/pwio.c.long-entry 2015-11-17 17:45:15.000000000 +0100
+++ shadow-4.5/lib/pwio.c 2018-04-20 12:10:24.400837235 +0200
@@ -79,7 +79,10 @@ static int passwd_put (const void *ent,
|| (pw->pw_gid == (gid_t)-1)
|| (valid_field (pw->pw_gecos, ":\n") == -1)
|| (valid_field (pw->pw_dir, ":\n") == -1)
- || (valid_field (pw->pw_shell, ":\n") == -1)) {
+ || (valid_field (pw->pw_shell, ":\n") == -1)
+ || (strlen (pw->pw_name) + strlen (pw->pw_passwd) +
+ strlen (pw->pw_gecos) + strlen (pw->pw_dir) +
+ strlen (pw->pw_shell) + 100 > PASSWD_ENTRY_MAX_LENGTH)) {
return -1;
}
diff -up shadow-4.5/lib/sgetpwent.c.long-entry shadow-4.5/lib/sgetpwent.c
--- shadow-4.5/lib/sgetpwent.c.long-entry 2014-09-01 16:36:40.000000000 +0200
+++ shadow-4.5/lib/sgetpwent.c 2018-04-20 12:16:31.911513808 +0200
@@ -57,7 +57,7 @@
struct passwd *sgetpwent (const char *buf)
{
static struct passwd pwent;
- static char pwdbuf[1024];
+ static char pwdbuf[PASSWD_ENTRY_MAX_LENGTH];
register int i;
register char *cp;
char *fields[NFIELDS];
@@ -67,8 +67,10 @@ struct passwd *sgetpwent (const char *bu
* the password structure remain valid.
*/
- if (strlen (buf) >= sizeof pwdbuf)
+ if (strlen (buf) >= sizeof pwdbuf) {
+ fprintf (stderr, "Too long passwd entry encountered, file corruption?\n");
return 0; /* fail if too long */
+ }
strcpy (pwdbuf, buf);
/*
diff -up shadow-4.5/lib/sgetspent.c.long-entry shadow-4.5/lib/sgetspent.c
--- shadow-4.5/lib/sgetspent.c.long-entry 2014-09-01 16:36:40.000000000 +0200
+++ shadow-4.5/lib/sgetspent.c 2018-04-20 12:16:54.505056257 +0200
@@ -48,7 +48,7 @@
*/
struct spwd *sgetspent (const char *string)
{
- static char spwbuf[1024];
+ static char spwbuf[PASSWD_ENTRY_MAX_LENGTH];
static struct spwd spwd;
char *fields[FIELDS];
char *cp;
@@ -61,6 +61,7 @@ struct spwd *sgetspent (const char *stri
*/
if (strlen (string) >= sizeof spwbuf) {
+ fprintf (stderr, "Too long shadow entry encountered, file corruption?\n");
return 0; /* fail if too long */
}
strcpy (spwbuf, string);
diff -up shadow-4.5/lib/shadowio.c.long-entry shadow-4.5/lib/shadowio.c
--- shadow-4.5/lib/shadowio.c.long-entry 2016-12-07 06:30:41.000000001 +0100
+++ shadow-4.5/lib/shadowio.c 2018-04-20 12:12:03.292171667 +0200
@@ -79,7 +79,9 @@ static int shadow_put (const void *ent,
if ( (NULL == sp)
|| (valid_field (sp->sp_namp, ":\n") == -1)
- || (valid_field (sp->sp_pwdp, ":\n") == -1)) {
+ || (valid_field (sp->sp_pwdp, ":\n") == -1)
+ || (strlen (sp->sp_namp) + strlen (sp->sp_pwdp) +
+ 1000 > PASSWD_ENTRY_MAX_LENGTH)) {
return -1;
}