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- fix segfault in faillock utility

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- remove some cases where the information of existence of
  an user account could be leaked by the pam_faillock,
  document the remaining case
This commit is contained in:
Tomas Mraz 2010-11-10 15:15:03 +01:00
parent a4d4d78281
commit 5310fecf62
3 changed files with 44 additions and 25 deletions
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33
pam-1.1.1-faillock.patch
View File

@ -596,8 +596,8 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/main.c.faillock Linux-PAM-1.1.1/mo
+ status & TALLY_STATUS_RHOST ? "RHOST" : (status & TALLY_STATUS_TTY ? "TTY" : "SVC"), + status & TALLY_STATUS_RHOST ? "RHOST" : (status & TALLY_STATUS_TTY ? "TTY" : "SVC"),
+ tallies.records[i].source, status & TALLY_STATUS_VALID ? "V":"I"); + tallies.records[i].source, status & TALLY_STATUS_VALID ? "V":"I");
+ } + }
+ free(tallies.records);
+ } + }
+ free(tallies.records);
+ close(fd); + close(fd);
+ return 0; + return 0;
+} +}
@ -698,7 +698,7 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/Makefile.am.faillock Linux-PAM-1.1
diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c
--- Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock 2010-09-17 15:58:41.000000000 +0200 --- Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock 2010-09-17 15:58:41.000000000 +0200
+++ Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c 2010-09-17 15:58:41.000000000 +0200 +++ Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c 2010-09-17 15:58:41.000000000 +0200
@@ -0,0 +1,548 @@ @@ -0,0 +1,550 @@
+/* +/*
+ * Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com> + * Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com>
+ * + *
@ -887,7 +887,7 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock Linux-PAM-
+ } + }
+ +
+ if (*user == '\0') { + if (*user == '\0') {
+ return PAM_USER_UNKNOWN; + return PAM_IGNORE;
+ } + }
+ +
+ if ((pwd=pam_modutil_getpwnam(pamh, user)) == NULL) { + if ((pwd=pam_modutil_getpwnam(pamh, user)) == NULL) {
@ -897,7 +897,7 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock Linux-PAM-
+ else { + else {
+ pam_syslog(pamh, LOG_ERR, "User unknown"); + pam_syslog(pamh, LOG_ERR, "User unknown");
+ } + }
+ return PAM_USER_UNKNOWN; + return PAM_IGNORE;
+ } + }
+ opts->user = user; + opts->user = user;
+ opts->uid = pwd->pw_uid; + opts->uid = pwd->pw_uid;
@ -1148,6 +1148,8 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock Linux-PAM-
+ +
+ args_parse(pamh, argc, argv, flags, &opts); + args_parse(pamh, argc, argv, flags, &opts);
+ +
+ pam_fail_delay(pamh, 2000000); /* 2 sec delay for on failure */
+
+ if ((rv=get_pam_user(pamh, &opts)) != PAM_SUCCESS) { + if ((rv=get_pam_user(pamh, &opts)) != PAM_SUCCESS) {
+ return rv; + return rv;
+ } + }
@ -1250,7 +1252,7 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.c.faillock Linux-PAM-
diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml
--- Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock 2010-09-17 15:58:41.000000000 +0200 --- Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock 2010-09-17 15:58:41.000000000 +0200
+++ Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml 2010-09-17 15:58:41.000000000 +0200 +++ Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml 2010-09-17 15:58:41.000000000 +0200
@@ -0,0 +1,385 @@ @@ -0,0 +1,396 @@
+<?xml version="1.0" encoding='UTF-8'?> +<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+ "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
@ -1513,10 +1515,10 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock Linux-
+ </listitem> + </listitem>
+ </varlistentry> + </varlistentry>
+ <varlistentry> + <varlistentry>
+ <term>PAM_USER_UNKNOWN</term> + <term>PAM_IGNORE</term>
+ <listitem> + <listitem>
+ <para> + <para>
+ User not known. + User not present in passwd database.
+ </para> + </para>
+ </listitem> + </listitem>
+ </varlistentry> + </varlistentry>
@ -1538,6 +1540,16 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock Linux-
+ (<errorcode>EACCES</errorcode>) the module returns + (<errorcode>EACCES</errorcode>) the module returns
+ <errorcode>PAM_SUCCESS</errorcode>. + <errorcode>PAM_SUCCESS</errorcode>.
+ </para> + </para>
+ <para>
+ Note that using the module in <option>preauth</option> without the
+ <option>silent</option> option or with <emphasis>requisite</emphasis>
+ control field leaks an information about existence or
+ non-existence of an user account in the system because
+ the failures are not recorded for the unknown users. The message
+ about the user account being locked is never displayed for nonexisting
+ user accounts allowing the adversary to infer that a particular account
+ is not existing on a system.
+ </para>
+ </refsect1> + </refsect1>
+ +
+ <refsect1 id='pam_faillock-examples'> + <refsect1 id='pam_faillock-examples'>
@ -1560,6 +1572,7 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock Linux-
+auth required pam_env.so +auth required pam_env.so
+auth required pam_nologin.so +auth required pam_nologin.so
+# optionally call: auth requisite pam_faillock.so preauth deny=4 even_deny_root unlock_time=1200 +# optionally call: auth requisite pam_faillock.so preauth deny=4 even_deny_root unlock_time=1200
+# to display the message about account being locked
+auth [success=1 default=bad] pam_unix.so +auth [success=1 default=bad] pam_unix.so
+auth [default=die] pam_faillock.so authfail deny=4 even_deny_root unlock_time=1200 +auth [default=die] pam_faillock.so authfail deny=4 even_deny_root unlock_time=1200
+auth sufficient pam_faillock.so authsucc deny=4 even_deny_root unlock_time=1200 +auth sufficient pam_faillock.so authsucc deny=4 even_deny_root unlock_time=1200
@ -1580,9 +1593,9 @@ diff -up Linux-PAM-1.1.1/modules/pam_faillock/pam_faillock.8.xml.faillock Linux-
+auth required pam_securetty.so +auth required pam_securetty.so
+auth required pam_env.so +auth required pam_env.so
+auth required pam_nologin.so +auth required pam_nologin.so
+auth requisite pam_faillock.so preauth deny=4 even_deny_root unlock_time=1200 +auth required pam_faillock.so preauth silent deny=4 even_deny_root unlock_time=1200
+# optionally use required above if you still want to prompt for the password +# optionally use requisite above if you do not want to prompt for the password
+# on locked accounts. +# on locked accounts, possibly with removing the silent option as well
+auth sufficient pam_unix.so +auth sufficient pam_unix.so
+auth [default=die] pam_faillock.so authfail deny=4 even_deny_root unlock_time=1200 +auth [default=die] pam_faillock.so authfail deny=4 even_deny_root unlock_time=1200
+auth required pam_deny.so +auth required pam_deny.so

28
pam-1.1.3-faillock-screensaver.patch
View File

@ -1,6 +1,6 @@
diff -up Linux-PAM-1.1.3/modules/pam_faillock/faillock.c.screensaver Linux-PAM-1.1.3/modules/pam_faillock/faillock.c diff -up Linux-PAM-1.1.3/modules/pam_faillock/faillock.c.screensaver Linux-PAM-1.1.3/modules/pam_faillock/faillock.c
--- Linux-PAM-1.1.3/modules/pam_faillock/faillock.c.screensaver 2010-11-05 18:13:28.000000000 +0100 --- Linux-PAM-1.1.3/modules/pam_faillock/faillock.c.screensaver 2010-11-10 11:46:07.000000000 +0100
+++ Linux-PAM-1.1.3/modules/pam_faillock/faillock.c 2010-11-05 18:13:28.000000000 +0100 +++ Linux-PAM-1.1.3/modules/pam_faillock/faillock.c 2010-11-10 11:46:07.000000000 +0100
@@ -41,13 +41,14 @@ @@ -41,13 +41,14 @@
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
@ -36,8 +36,8 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/faillock.c.screensaver Linux-PAM-1
return fd; return fd;
} }
diff -up Linux-PAM-1.1.3/modules/pam_faillock/faillock.h.screensaver Linux-PAM-1.1.3/modules/pam_faillock/faillock.h diff -up Linux-PAM-1.1.3/modules/pam_faillock/faillock.h.screensaver Linux-PAM-1.1.3/modules/pam_faillock/faillock.h
--- Linux-PAM-1.1.3/modules/pam_faillock/faillock.h.screensaver 2010-11-05 18:13:28.000000000 +0100 --- Linux-PAM-1.1.3/modules/pam_faillock/faillock.h.screensaver 2010-11-10 11:46:07.000000000 +0100
+++ Linux-PAM-1.1.3/modules/pam_faillock/faillock.h 2010-11-05 18:27:23.000000000 +0100 +++ Linux-PAM-1.1.3/modules/pam_faillock/faillock.h 2010-11-10 11:46:07.000000000 +0100
@@ -45,6 +45,7 @@ @@ -45,6 +45,7 @@
#define _FAILLOCK_H #define _FAILLOCK_H
@ -56,8 +56,8 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/faillock.h.screensaver Linux-PAM-1
int update_tally(int fd, struct tally_data *tallies); int update_tally(int fd, struct tally_data *tallies);
#endif #endif
diff -up Linux-PAM-1.1.3/modules/pam_faillock/main.c.screensaver Linux-PAM-1.1.3/modules/pam_faillock/main.c diff -up Linux-PAM-1.1.3/modules/pam_faillock/main.c.screensaver Linux-PAM-1.1.3/modules/pam_faillock/main.c
--- Linux-PAM-1.1.3/modules/pam_faillock/main.c.screensaver 2010-11-05 18:13:28.000000000 +0100 --- Linux-PAM-1.1.3/modules/pam_faillock/main.c.screensaver 2010-11-10 11:46:07.000000000 +0100
+++ Linux-PAM-1.1.3/modules/pam_faillock/main.c 2010-11-05 18:13:28.000000000 +0100 +++ Linux-PAM-1.1.3/modules/pam_faillock/main.c 2010-11-10 11:46:07.000000000 +0100
@@ -106,8 +106,11 @@ do_user(struct options *opts, const char @@ -106,8 +106,11 @@ do_user(struct options *opts, const char
int fd; int fd;
int rv; int rv;
@ -83,8 +83,8 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/main.c.screensaver Linux-PAM-1.1.3
pwd->pw_uid); pwd->pw_uid);
audit_log_user_message(audit_fd, AUDIT_USER_ACCT, audit_log_user_message(audit_fd, AUDIT_USER_ACCT,
diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c
--- Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver 2010-11-05 18:13:28.000000000 +0100 --- Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver 2010-11-10 11:46:07.000000000 +0100
+++ Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c 2010-11-05 18:13:28.000000000 +0100 +++ Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c 2010-11-10 11:46:07.000000000 +0100
@@ -213,7 +213,7 @@ check_tally(pam_handle_t *pamh, struct o @@ -213,7 +213,7 @@ check_tally(pam_handle_t *pamh, struct o
opts->now = time(NULL); opts->now = time(NULL);
@ -121,7 +121,7 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver Linux-P
} }
if (*fd == -1) { if (*fd == -1) {
if (errno == EACCES) { if (errno == EACCES) {
@@ -461,7 +466,7 @@ pam_sm_authenticate(pam_handle_t *pamh, @@ -463,7 +468,7 @@ pam_sm_authenticate(pam_handle_t *pamh,
case FAILLOCK_ACTION_AUTHSUCC: case FAILLOCK_ACTION_AUTHSUCC:
rv = check_tally(pamh, &opts, &tallies, &fd); rv = check_tally(pamh, &opts, &tallies, &fd);
@ -130,7 +130,7 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver Linux-P
reset_tally(pamh, &opts, &fd); reset_tally(pamh, &opts, &fd);
} }
break; break;
@@ -509,10 +514,8 @@ pam_sm_acct_mgmt(pam_handle_t *pamh, int @@ -511,10 +516,8 @@ pam_sm_acct_mgmt(pam_handle_t *pamh, int
return rv; return rv;
} }
@ -144,8 +144,8 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.c.screensaver Linux-P
tally_cleanup(&tallies, fd); tally_cleanup(&tallies, fd);
diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml.screensaver Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml.screensaver Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml
--- Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml.screensaver 2010-11-05 18:13:28.000000000 +0100 --- Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml.screensaver 2010-11-10 11:46:07.000000000 +0100
+++ Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml 2010-11-05 18:13:28.000000000 +0100 +++ Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml 2010-11-10 11:47:14.000000000 +0100
@@ -277,13 +277,9 @@ @@ -277,13 +277,9 @@
from the <emphasis>pam_tally2</emphasis> module setup. from the <emphasis>pam_tally2</emphasis> module setup.
</para> </para>
@ -161,5 +161,5 @@ diff -up Linux-PAM-1.1.3/modules/pam_faillock/pam_faillock.8.xml.screensaver Lin
+ the user. This allows <emphasis remap='B'>pam_faillock.so</emphasis> module + the user. This allows <emphasis remap='B'>pam_faillock.so</emphasis> module
+ to work correctly when it is called from a screensaver. + to work correctly when it is called from a screensaver.
</para> </para>
</refsect1> <para>
Note that using the module in <option>preauth</option> without the

8
pam.spec
View File

@ -3,7 +3,7 @@
Summary: An extensible library which provides authentication for applications Summary: An extensible library which provides authentication for applications
Name: pam Name: pam
Version: 1.1.3 Version: 1.1.3
Release: 2%{?dist} Release: 3%{?dist}
# The library is BSD licensed with option to relicense as GPLv2+ - this option is redundant # The library is BSD licensed with option to relicense as GPLv2+ - this option is redundant
# as the BSD license allows that anyway. pam_timestamp and pam_console modules are GPLv2+, # as the BSD license allows that anyway. pam_timestamp and pam_console modules are GPLv2+,
License: BSD and GPLv2+ License: BSD and GPLv2+
@ -345,6 +345,12 @@ fi
%doc doc/adg/*.txt doc/adg/html %doc doc/adg/*.txt doc/adg/html
%changelog %changelog
* Wed Nov 10 2010 Tomas Mraz <tmraz@redhat.com> 1.1.3-3
- fix segfault in faillock utility
- remove some cases where the information of existence of
an user account could be leaked by the pam_faillock,
document the remaining case
* Fri Nov 5 2010 Tomas Mraz <tmraz@redhat.com> 1.1.3-2 * Fri Nov 5 2010 Tomas Mraz <tmraz@redhat.com> 1.1.3-2
- fix a mistake in the abstract X-socket connect - fix a mistake in the abstract X-socket connect
- make pam_faillock work with screensaver - make pam_faillock work with screensaver