Commit Graph

109 Commits

Author SHA1 Message Date
Jussi Ohenoja
a3bf32fe87 shadow: Add auditing support to su
This patch extends the auditing feature used in login to su.

Signed-off-by: Jussi Ohenoja <jussi.ohenoja@nokia.com>
2016-12-13 18:44:19 +02:00
Adam Sampson
924cc34647 Use sizeof rather than hardcoding snprintf's size argument. 2016-09-20 08:04:14 +01:00
Serge Hallyn
67d2bb6e0a su.c: fix missing length argument to snprintf 2016-09-18 21:31:18 -05:00
Serge Hallyn
5b017af90d Merge pull request #29 from hemio-ev/lower-su-syslog-priority
Reduces syslog priority of common usage events
2016-08-05 11:59:15 -05:00
Michael Herold
61fc90b268 Reduces syslog priority of common usage events
- Log INFO instead of ERR on `su missing-user`
- Log NOTICE/WARN instead of ERR on pam_authenticate failure (wrong password for example)
2016-08-04 22:17:31 +02:00
Tobias Stoeckmann
dd50014055 Fixed signal races in shadow tools.
Some of the supplied tools use functions which are not signal-safe.

Most of the times it's exit() vs. _exit().

In other times it's how the standard output or standard error is
handled. FILE-related functions shall be avoided, therefore I replaced
them with write().

Also there is no need to call closelog(). At worst, it allows to
trigger a deadlock by issuing different signal types at bad timings.
But as these fixes are about race conditions, expect bad timings in
general for these bugs to be triggered. :)
2016-07-02 18:11:09 +02:00
Nicolas François
00f573fce2 Fix copyright dates. 2013-08-13 23:13:26 +02:00
Nicolas François
8781aff637 Terminate the child before closing the PAM session.
* src/su.c: Terminate the child (if needed) before closing the PAM
	session. This is probably more correct, and avoid reporting
	termination from signals possibly sent by PAM modules (e.g. former
	versions of pam_systemd). Debian#670132
2013-08-13 19:48:53 +02:00
Nicolas François
a5e3dbb0e3 Reset caught variable when signal is handled by su.
* src/su.c: When a SIGTSTP is caught, reset caught to 0. There is
	no need to kill the child in such case after su is resumed. This
	remove the "Session terminated, terminating shell...
	...terminated." messages in such case.
2013-08-13 19:42:50 +02:00
Colin Watson
d172cccd07 Kill the child process group, rather than just the immediate child;
this is needed now that su no longer starts a controlling terminal
when not running an interactive shell (closes: Debian#713979)
2013-07-28 14:38:12 +02:00
nekral-guest
9151e673e4 * NEWS: Set release date. 2012-05-25 11:51:53 +00:00
nekral-guest
f100b5ea7e * src/su.c: non PAM enabled versions: do not fail if su is called
without a controlling terminal. Ignore ENXIO errors when opening
	/dev/tty.
2012-05-20 16:15:14 +00:00
nekral-guest
f0a63185c9 * src/chage.c, src/chgpasswd.c, src/chpasswd.c, src/chsh.c,
src/faillog.c, src/gpasswd.c, src/groupadd.c, src/groupdel.c,
	src/groupmems.c, src/groupmod.c, src/grpconv.c, src/grpunconv.c,
	src/lastlog.c, src/newusers.c, src/passwd.c, src/pwconv.c,
	src/pwunconv.c, src/su.c, src/useradd.c, src/userdel.c,
	src/usermod.c, src/vipw.c: Align and sort options.
2011-11-06 18:39:59 +00:00
nekral-guest
6eb0500d3d * src/faillog.c, src/chage.c, src/newusers.c, src/su.c: The getopt
index of long options is not used.
2011-11-06 18:38:45 +00:00
nekral-guest
6f05b866bc * src/su.c: Too much const were added on 2011-08-15. pw in
save_caller_context() is allocated and freed.
	* src/su.c: Added missing #endif indication
	* src/su.c save_caller_context(): password only needed if
	SU_ACCESS and !USE_PAM.
2011-09-18 17:47:03 +00:00
nekral-guest
5eb9ed0aaf * src/su.c: Added const modifiers.
* lib/prototypes: Synchronize splint annotations.
2011-08-15 09:25:58 +00:00
nekral-guest
94c1763f71 * src/su.c: Add splint annotations.
* src/su.c: Set caller_on_console as boolean.
	* src/su.c: Ignore retunr value from fputs (usage) / puts (prompt).
	* src/su.c: Improved memory management.
2011-08-14 21:44:46 +00:00
nekral-guest
745bcb5406 * src/su.c: Add annotations to indicate that su_failure() does
not return.
2011-08-14 13:15:20 +00:00
nekral-guest
907025eb40 * src/su.c: environ is provided by <unistd.h>.
* src/su.c: Added function prototypes.
	* src/su.c: Rename shellstr parameter to shellname to avoid
	collision with static variable.
	* NEWS, src/su.c: Added support for PAM modules which change
	PAM_USER.
2011-06-16 21:21:29 +00:00
nekral-guest
66d71aafb7 Cleanup. 2011-06-13 18:27:51 +00:00
nekral-guest
317939e821 * src/su.c: After prepare_pam_close_session() there is no need to
close the session in the child. Added pam_setcred to
	prepare_pam_close_session().
2011-06-13 18:27:46 +00:00
nekral-guest
1340beed16 * src/su.c: Also drop the controlling terminal when PAM is not
used.
	* src/su.c: Remove run_shell().
2011-06-13 18:27:40 +00:00
nekral-guest
e9045e9f55 * src/su.c (prepare_pam_close_session): Extract the creation of a
child and listening for signal in the parent from run_shell().
	prepare_pam_close_session() is now executed before the creation of
	the pam session and before the UID is changed. This allows to
	close the session as root.
2011-06-13 18:27:34 +00:00
nekral-guest
69371ba2c2 * src/su.c: Extract export of environment from main(). 2011-06-13 18:27:28 +00:00
nekral-guest
dbe0b96404 * src/su.c: Extract command line processing from main(). 2011-06-13 18:27:23 +00:00
nekral-guest
43e65fdd46 * src/su.c: Close the password databases together with syslog. 2011-06-13 18:27:17 +00:00
nekral-guest
5d6f4f8ea4 * src/su.c: Merge environment setting blocks after the creation of
the session.
2011-06-13 18:27:12 +00:00
nekral-guest
b63c830547 * src/su.c: Cleanup check_perms_nopam(). 2011-06-13 18:27:06 +00:00
nekral-guest
927c2f06a3 * src/su.c: Split check_perms() in to a PAM (check_perms_pam) and
a non-PAM (check_perms_nopam) version.
2011-06-13 18:26:58 +00:00
nekral-guest
40a16a1b04 Compile fixes & cleanups. 2011-06-13 18:26:52 +00:00
nekral-guest
6be3ac560b * src/su.c (save_caller_context): Extract from main() the code
used to save the caller's context.
2011-06-13 18:26:47 +00:00
nekral-guest
b661b913b5 * src/su.c: Cleanup local variables. 2011-06-13 18:26:36 +00:00
nekral-guest
b273c4d19f Cleanup comments. 2011-06-13 18:26:31 +00:00
nekral-guest
7ebfb5c90f * lib/prototypes.h, src/suauth.c, src/su.c (check_su_auth): Do not
use the pwent global variable to communicate between APIs of
	different files. Added boolean parameter su_to_root to
	check_su_auth().
	* src/su.c (check_perms): Return the passwd entry of the finally
	authenticated user. Remove usage of the pwent variable.
	* src/su.c: The password of the caller is the one from the
	spwd structure only if the passwd's password is 'x'.
2011-06-13 18:26:26 +00:00
nekral-guest
3abd71c526 * src/su.c: Extract the authentication from the main function. 2011-06-13 18:26:16 +00:00
nekral-guest
dc90c77285 * src/su.c: Define shellstr before the environment so that
restricted_shell is called only once. This will allow moving the
	environment definition after the switch to the new user.
2011-06-13 18:26:10 +00:00
nekral-guest
2f71935616 * src/su.c: Move definition of change_environment and shellstr
after the switch to the final subsystem. The previous architecture
	forced to always change the environment (the shell starts with a
	'*' and was thus restricted, and change_environment could not be
	reset to false).
2011-06-13 18:25:57 +00:00
nekral-guest
941e94f1d2 * src/su.c: No need to change the user's shell in case of
subsystem root. Update the comments.
2011-06-13 18:25:51 +00:00
nekral-guest
4be8077a56 * src/su.c: Group some of the environment processing blocks. The
definition of shellstr, PATH and IFS is not influenced (getenv,
	getdef, restricted_shell) by and does not influence (addenv does
	not change environ) the authentication. And the authentication
	does not overwrite those definitions. This will ease an extraction
	from the big main() function.
2011-06-13 18:25:45 +00:00
nekral-guest
aef33a89c2 * src/su.c: No need to call expire() if there are no shadow entry.
No need to convert a passwd entry into an spwd entry in that case.
2011-06-13 18:25:40 +00:00
nekral-guest
1ddde00b1d * src/su.c: Updating pwent after expire() is not useful. Only the
password information may have changed and they are not used
	anymore afterwards.
2011-06-13 18:25:34 +00:00
nekral-guest
b5403415f7 * NEWS, src/su.c: Do not forward the controlling terminal to
commands executed with -c. This prevents tty hijacking which could
	lead to execution with the caller's privileges. This required to
	forward signals from the terminal (SIGINT, SIGQUIT, SIGTSTP) to
	the executed command.
2011-06-05 14:41:15 +00:00
nekral-guest
991ce97170 * src/su.c: Fix handling of environment variables when
the environment is not changed. In particular, this makes su
	behave as documented regarding PATH and IFS (i.e. they are reset)
	when -p is provided.
2010-08-28 19:55:31 +00:00
nekral-guest
ab9427420e * src/newgrp.c, src/userdel.c, src/grpck.c, src/gpasswd.c,
src/newusers.c, src/pwconv.c, src/chpasswd.c, src/logoutd.c,
	src/chfn.c, src/groupmems.c, src/usermod.c, src/pwunconv.c,
	src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/useradd.c,
	src/su.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/chage.c,
	src/groupadd.c, src/login.c, src/grpconv.c, src/groups.c,
	src/grpunconv.c, src/chsh.c: Prog changed to a constant string.
2010-08-22 19:36:09 +00:00
nekral-guest
07e462f01f * libmisc/limits.c: Avoid implicit conversion of integer to
boolean.
	* libmisc/basename.c: Avoid implicit conversion of pointer to
	boolean.
	* libmisc/basename.c, lib/prototypes.h (Basename): Return a
	constant string.
	* libmisc/basename.c, libmisc/obscure.c, lib/prototypes.h,
	libmisc/xmalloc.c, libmisc/getdate.h, libmisc/system.c,
	libmisc/getgr_nam_gid.c, libmisc/failure.c, libmisc/valid.c: Add
	splint annotations.
	* libmisc/chowndir.c: Avoid memory leak.
	* libmisc/chowndir.c: Do not check *printf/*puts return value.
	* libmisc/chowntty.c: Avoid implicit conversion between integer
	types.
	* libmisc/obscure.c: Return a bool when possible instead of int.
	* libmisc/shell.c: Do not check *printf/*puts return value.
	* libmisc/shell.c: Do not check execle return value.
	* libmisc/setupenv.c: Avoid implicit conversion between integer
	types.
	* libmisc/xmalloc.c: size should not be zero to avoid returning
	NULL pointers.
	* libmisc/hushed.c: Do not check *printf/*puts return value.
	* libmisc/system.c: Avoid implicit conversion of integer to
	boolean. safe_system last argument is a boolean.
	* libmisc/system.c: Check return value of dup2.
	* libmisc/system.c: Do not check *printf/*puts return value.
	* libmisc/system.c: Do not check execve return value. 
	* libmisc/salt.c: Do not check *printf/*puts return value.
	* libmisc/loginprompt.c: Do not check gethostname return value.
	* libmisc/find_new_gid.c, libmisc/find_new_uid.c: Do not check
	gr_rewind/pw_rewind return value.
	* libmisc/ttytype.c: Limit the number of parsed characters in the
	sscanf format.
	* libmisc/ttytype.c: Test if a type was really read.
	* libmisc/sub.c: Do not check *printf/*puts return value.
	* libmisc/sub.c: Avoid implicit conversion of integer to boolean.
	* src/userdel.c: Fix typo in comment.
	* src/userdel.c: Avoid implicit conversion of boolean to integer.
	* src/userdel.c: safe_system last argument is a boolean.
	* src/newusers.c: Avoid implicit conversion of boolean to integer.
	* src/newusers.c: Avoid implicit conversion of integer to boolean.
	* src/usermod.c: Add brackets.
	* src/usermod.c: Avoid implicit conversion of characters or
	integers to booleans.
	* src/vipw.c: Avoid implicit conversion of integer to boolean.
	* src/su.c: Avoid implicit conversion of integer to boolean.
	* src/su.c: Add brackets.
	* src/useradd.c: Avoid implicit conversion of characters or
	integers to booleans.
2010-08-22 19:13:53 +00:00
nekral-guest
7eb6a4b3a4 Updated copyrights. 2010-08-22 13:04:54 +00:00
nekral-guest
471a2df3a6 * libmisc/obscure.c, lib/prototypes.h (obscure): Return a bool
instead of an int.
	* libmisc/obscure.c, libmisc/tz.c, src/passwd.c, lib/encrypt.c,
	libmisc/copydir.c, lib/prototypes.h: Add splint annotations.
	* libmisc/tz.c: Fix some const issues.
	* libmisc/tz.c: Avoid multi-statements lines.
	* libmisc/tz.c: Add brackets.
	* libmisc/copydir.c: Do not check *printf/*puts return value.
	* libmisc/copydir.c: Fail if we cannot set or reset the SELinux
	fscreate context.
	* libmisc/copydir.c: Use xmalloc instead of malloc.
	* libmisc/copydir.c: Do not check lutimes return value
	* src/vipw.c: Avoid implicit conversion of integer to boolean.
	* src/su.c (iswheel): Return a bool instead of an int.
	* src/passwd.c: Remove insert_crypt_passwd(). Use xstrdup instead.
	* src/passwd.c: Return constant strings when sufficient.
	* src/passwd.c: Do not check *printf/*puts return value.
	* src/passwd.c: Avoid implicit conversion of character to boolean.
	* src/passwd.c: Do not check sleep return value.
	* src/sulogin.c: Do not check *printf/*puts return value.
	* lib/encrypt.c: Do not check fprintf return value.
2010-08-22 12:49:07 +00:00
nekral-guest
427b60f288 * src/su.c: shell's name must be -su when a su fakes a login. 2010-03-30 21:32:36 +00:00
nekral-guest
fcd5b38caf * src/su.c, src/vipw.c, src/newgrp.c: When the child is
interrupted, stop ourself with a SIGSTOP signal.
2010-03-23 13:05:06 +00:00
nekral-guest
291b28ac52 * src/su.c: Do not sanitize the environment. This breaks
--preserve-environment. This sanitation was disabled on Debian
	since quite some time with no reported issues, and sanitize_env()
	documentation agrees that it should be useless as all modern
	Unixes will handle setuid executables properly. This Fixes
	Alioth#312287.
2010-01-24 17:13:40 +00:00