Commit Graph

460 Commits

Author SHA1 Message Date
Alejandro Colomar
4e1afcd662 Assume STDC_HEADERS will always be defined
We're in 2021.  C89 is everywhere; in fact, there are many other
assumptions in the code that wouldn't probably hold on
pre-standard C environments.  Let's simplify and assume that C89
is available.

The specific assumptions are that:
- <string.h>, and <stdlib.h> are available
- strchr(3), strrchr(3), and strtok(3) are available
- isalpha(3), isspace(3), isdigit(3), and isupper(3) are available

I think we can safely assume we have all of those.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
2021-12-29 02:39:04 +01:00
Alejandro Colomar
b7e12ec04e Remove HAVE_MEMSET ifdefs
memset(3) has been in standard C since C89.  It is also in
POSIX.1-2001, in SVr4, and in 4.3BSD (see memset(3) and memset(3p)).
We can assume that this function is always available.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
2021-12-27 21:52:00 +01:00
Alejandro Colomar
047bfc47c6 Remove HAVE_MEMCPY ifdefs
memcpy(3) has been in standard C since C89.  It is also in
POSIX.1-2001, in SVr4, and in 4.3BSD (see memcpy(3) and memcpy(3p)).
We can assume that this function is always available.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
2021-12-27 21:38:47 +01:00
Adam Sampson
2b0bdef6f9 lib: provide default values for shadow_progname/shadow_logfd 2021-12-27 16:28:23 +00:00
Serge Hallyn
e1b1d187f4
Merge pull request #467 from alejandro-colomar/date_to_str
Have a single definition of date_to_str()
2021-12-27 09:53:00 -06:00
Alejandro Colomar
355ad6a9e0 Have a single definition of date_to_str()
PARAMETERS:

According to the C2x charter, I reordered the parameters 'size'
and 'buf' from previously existing date_to_str() definitions.

C2x charter:
> 15. Application Programming Interfaces (APIs) should be
> self-documenting when possible.  In particular, the order of
> parameters in function declarations should be arranged such that
> the size of an array appears before the array.  The purpose is to
> allow Variable-Length Array (VLA) notation to be used.  This not
> only makes the code's purpose clearer to human readers, but also
> makes static analysis easier.  Any new APIs added to the Standard
> should take this into consideration.

I used 'long' for the date parameter, as some uses of the function
need to pass a negative value meaning "never".

FUNCTION BODY:

I didn't check '#ifdef HAVE_STRFTIME', which old definitions did,
since strftime(3) is guaranteed by the C89 standard, and all of
the conversion specifiers that we use are also specified by that
standard, so we don't need any extensions at all.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
2021-12-26 18:55:39 +01:00
Adam Sampson
0e6fe5e728 lib: rename Prog to shadow_progname, with only one definition
The build was failing with duplicate symbol errors with -fno-common.
This is the default in GCC 10 and later, and explicitly enabled in some
distributions to catch problems like this. There were two causes:

- Prog and shadow_logfd were defined in a header file that was included
  in multiple other files. Fix this by defining them once in
  shadowlog.c, and having extern declarations in the header.

- Most of the tools (except id/nologin) also define a Prog variable,
  which is not intended to alias the one in the library. Fix
  this by renaming Prog in the library to shadow_progname, which also
  matches the new accessor functions for it.
2021-12-25 22:41:58 +00:00
Serge Hallyn
f93cf255d4 Update licensing info
Closes #238

Update all files to list SPDX license shortname.  Most files are
BSD 3 clause license.

The exceptions are:

serge@sl ~/src/shadow$ git grep SPDX-License | grep -v BSD-3-Clause
contrib/atudel:# SPDX-License-Identifier: BSD-4-Clause
lib/tcbfuncs.c: * SPDX-License-Identifier: 0BSD
libmisc/salt.c: * SPDX-License-Identifier: Unlicense
src/login_nopam.c: * SPDX-License-Identifier: Unlicense
src/nologin.c: * SPDX-License-Identifier: BSD-2-Clause
src/vipw.c: * SPDX-License-Identifier: GPL-2.0-or-later

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-12-23 19:36:50 -06:00
Serge Hallyn
79157cbad8 Make shadow_logfd and Prog not extern
Closes #444
Closes #465

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-12-23 15:18:07 -06:00
Iker Pedrosa
d594243fbb lib: check NULL before freeing passwd data
Add an additional NULL check condition in spw_free() and pw_free() to
avoid freeing an already empty pointer.

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
2021-11-19 12:09:59 +01:00
(GalaxyMaster)
a97399dd0a Add missing chmod()
During shadowtcb_move() the directory is temporarily changed to be
owned by root:root with permissions 0700.  After the change is done,
the ownership and permissions were supposed to be restored.  The
call for chown() was there, but the chmod() call was missing.  This
resulted in the broken TCB functionality.  The added chmod() fixes
the issue.
2021-10-28 11:16:59 +11:00
Iker Pedrosa
234af5cf67 semanage: close the selabel handle
Close the selabel handle to update the file_context. This means that the
file_context will be remmaped and used by selabel_lookup() to return
the appropriate context to label the home folder.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1993081

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
2021-10-25 09:55:31 +02:00
a1346054
d7c9550b7f fix spelling 2021-09-13 15:11:40 +00:00
a1346054
7687ae4dbd fix spelling and unify whitespace 2021-08-18 18:06:02 +00:00
Serge Hallyn
537b8cd90b Fix out of tree builds with respect to libsubid includes
There's a better way to do this, and I hope to clean that up,
but this fixes out of tree builds for me right now.

Closes #386

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-07-23 17:51:13 -05:00
Björn Esser
c93897a8d7
lib/defines.h: Include <crypt.h> if present on the system.
The functions crypt(3), crypt_gensalt(3), and their
feature test macros may be defined in there.

Signed-off-by: Björn Esser <besser82@fedoraproject.org>
2021-07-04 13:01:21 +02:00
Iker Pedrosa
e65cc6aebc Fix covscan RESOURCE_LEAK
Error: RESOURCE_LEAK (CWE-772): [#def1]
shadow-4.8.1/lib/commonio.c:320: alloc_fn: Storage is returned from allocation function "fopen_set_perms".
shadow-4.8.1/lib/commonio.c:320: var_assign: Assigning: "bkfp" = storage returned from "fopen_set_perms(backup, "w", &sb)".
shadow-4.8.1/lib/commonio.c:329: noescape: Resource "bkfp" is not freed or pointed-to in "putc".
shadow-4.8.1/lib/commonio.c:334: noescape: Resource "bkfp" is not freed or pointed-to in "fflush".
shadow-4.8.1/lib/commonio.c:339: noescape: Resource "bkfp" is not freed or pointed-to in "fileno".
shadow-4.8.1/lib/commonio.c:342: leaked_storage: Variable "bkfp" going out of scope leaks the storage it points to.
  340|   	    || (fclose (bkfp) != 0)) {
  341|   		/* FIXME: unlink the backup file? */
  342|-> 		return -1;
  343|   	}
  344|

Error: RESOURCE_LEAK (CWE-772): [#def2]
shadow-4.8.1/libmisc/addgrps.c:69: alloc_fn: Storage is returned from allocation function "malloc".
shadow-4.8.1/libmisc/addgrps.c:69: var_assign: Assigning: "grouplist" = storage returned from "malloc(i * 4UL)".
shadow-4.8.1/libmisc/addgrps.c:73: noescape: Resource "grouplist" is not freed or pointed-to in "getgroups". [Note: The source code implementation of the function has been overridden by a builtin model.]
shadow-4.8.1/libmisc/addgrps.c:126: leaked_storage: Variable "grouplist" going out of scope leaks the storage it points to.
  124|   	}
  125|
  126|-> 	return 0;
  127|   }
  128|   #else				/* HAVE_SETGROUPS && !USE_PAM */

Error: RESOURCE_LEAK (CWE-772): [#def3]
shadow-4.8.1/libmisc/chowntty.c:62: alloc_fn: Storage is returned from allocation function "getgr_nam_gid".
shadow-4.8.1/libmisc/chowntty.c:62: var_assign: Assigning: "grent" = storage returned from "getgr_nam_gid(getdef_str("TTYGROUP"))".
shadow-4.8.1/libmisc/chowntty.c:98: leaked_storage: Variable "grent" going out of scope leaks the storage it points to.
   96|   	 */
   97|   #endif
   98|-> }
   99|

Error: RESOURCE_LEAK (CWE-772): [#def4]
shadow-4.8.1/libmisc/copydir.c:742: open_fn: Returning handle opened by "open". [Note: The source code implementation of the function has been overridden by a user model.]
shadow-4.8.1/libmisc/copydir.c:742: var_assign: Assigning: "ifd" = handle returned from "open(src, 0)".
shadow-4.8.1/libmisc/copydir.c:748: leaked_handle: Handle variable "ifd" going out of scope leaks the handle.
  746|   #ifdef WITH_SELINUX
  747|   	if (set_selinux_file_context (dst, NULL) != 0) {
  748|-> 		return -1;
  749|   	}
  750|   #endif				/* WITH_SELINUX */

Error: RESOURCE_LEAK (CWE-772): [#def5]
shadow-4.8.1/libmisc/copydir.c:751: open_fn: Returning handle opened by "open". [Note: The source code implementation of the function has been overridden by a user model.]
shadow-4.8.1/libmisc/copydir.c:751: var_assign: Assigning: "ofd" = handle returned from "open(dst, 577, statp->st_mode & 0xfffU)".
shadow-4.8.1/libmisc/copydir.c:752: noescape: Resource "ofd" is not freed or pointed-to in "fchown_if_needed".
shadow-4.8.1/libmisc/copydir.c:775: leaked_handle: Handle variable "ofd" going out of scope leaks the handle.
  773|   	   ) {
  774|   		(void) close (ifd);
  775|-> 		return -1;
  776|   	}
  777|

Error: RESOURCE_LEAK (CWE-772): [#def7]
shadow-4.8.1/libmisc/idmapping.c:188: alloc_fn: Storage is returned from allocation function "xmalloc".
shadow-4.8.1/libmisc/idmapping.c:188: var_assign: Assigning: "buf" = storage returned from "xmalloc(bufsize)".
shadow-4.8.1/libmisc/idmapping.c:188: var_assign: Assigning: "pos" = "buf".
shadow-4.8.1/libmisc/idmapping.c:213: noescape: Resource "buf" is not freed or pointed-to in "write".
shadow-4.8.1/libmisc/idmapping.c:219: leaked_storage: Variable "pos" going out of scope leaks the storage it points to.
shadow-4.8.1/libmisc/idmapping.c:219: leaked_storage: Variable "buf" going out of scope leaks the storage it points to.
  217|   	}
  218|   	close(fd);
  219|-> }

Error: RESOURCE_LEAK (CWE-772): [#def8]
shadow-4.8.1/libmisc/list.c:211: alloc_fn: Storage is returned from allocation function "xstrdup".
shadow-4.8.1/libmisc/list.c:211: var_assign: Assigning: "members" = storage returned from "xstrdup(comma)".
shadow-4.8.1/libmisc/list.c:217: var_assign: Assigning: "cp" = "members".
shadow-4.8.1/libmisc/list.c:218: noescape: Resource "cp" is not freed or pointed-to in "strchr".
shadow-4.8.1/libmisc/list.c:244: leaked_storage: Variable "cp" going out of scope leaks the storage it points to.
shadow-4.8.1/libmisc/list.c:244: leaked_storage: Variable "members" going out of scope leaks the storage it points to.
  242|   	if ('\0' == *members) {
  243|   		*array = (char *) 0;
  244|-> 		return array;
  245|   	}
  246|

Error: RESOURCE_LEAK (CWE-772): [#def11]
shadow-4.8.1/libmisc/myname.c:61: alloc_fn: Storage is returned from allocation function "xgetpwnam".
shadow-4.8.1/libmisc/myname.c:61: var_assign: Assigning: "pw" = storage returned from "xgetpwnam(cp)".
shadow-4.8.1/libmisc/myname.c:67: leaked_storage: Variable "pw" going out of scope leaks the storage it points to.
   65|   	}
   66|
   67|-> 	return xgetpwuid (ruid);
   68|   }
   69|

Error: RESOURCE_LEAK (CWE-772): [#def12]
shadow-4.8.1/libmisc/user_busy.c:260: alloc_fn: Storage is returned from allocation function "opendir".
shadow-4.8.1/libmisc/user_busy.c:260: var_assign: Assigning: "task_dir" = storage returned from "opendir(task_path)".
shadow-4.8.1/libmisc/user_busy.c:262: noescape: Resource "task_dir" is not freed or pointed-to in "readdir".
shadow-4.8.1/libmisc/user_busy.c:278: leaked_storage: Variable "task_dir" going out of scope leaks the storage it points to.
  276|   					         _("%s: user %s is currently used by process %d\n"),
  277|   					         Prog, name, pid);
  278|-> 					return 1;
  279|   				}
  280|   			}

Error: RESOURCE_LEAK (CWE-772): [#def20]
shadow-4.8.1/src/newgrp.c:162: alloc_fn: Storage is returned from allocation function "xgetspnam".
shadow-4.8.1/src/newgrp.c:162: var_assign: Assigning: "spwd" = storage returned from "xgetspnam(pwd->pw_name)".
shadow-4.8.1/src/newgrp.c:234: leaked_storage: Variable "spwd" going out of scope leaks the storage it points to.
  232|   	}
  233|
  234|-> 	return;
  235|
  236|   failure:

Error: RESOURCE_LEAK (CWE-772): [#def21]
shadow-4.8.1/src/passwd.c:530: alloc_fn: Storage is returned from allocation function "xstrdup".
shadow-4.8.1/src/passwd.c:530: var_assign: Assigning: "cp" = storage returned from "xstrdup(crypt_passwd)".
shadow-4.8.1/src/passwd.c:551: noescape: Resource "cp" is not freed or pointed-to in "strlen".
shadow-4.8.1/src/passwd.c:554: noescape: Resource "cp" is not freed or pointed-to in "strcat". [Note: The source code implementation of the function has been overridden by a builtin model.]
shadow-4.8.1/src/passwd.c:555: overwrite_var: Overwriting "cp" in "cp = newpw" leaks the storage that "cp" points to.
  553|   		strcpy (newpw, "!");
  554|   		strcat (newpw, cp);
  555|-> 		cp = newpw;
  556|   	}
  557|   	return cp;
2021-06-24 09:18:35 +02:00
Serge Hallyn
9d169ffc41 fix newusers when nss provides subids
Closes #331

1. drop 'has_any_range' nss method as it is not useful

2. do not try to create a subid range in newusers when using nss for
   subids, since that's not possible.

Signed-off-by: Serge Hallyn <serge@hallyn.com>
(cherry picked from commit 88a434adbdcf4a8640793fd58bcd2ba77598349d)
2021-05-23 08:16:16 -05:00
Serge Hallyn
3d670ba7ed nss/libsubid: simplify the ranges variable for list_owner_ranges
Following alexey-tikhonov's suggestion.

Since we've dropped the 'owner' field in the data returned for
get_subid_ranges, we can just return a single allocated array of
simple structs.  This means we can return a ** instead of ***, and
we can get rid of the subid_free_ranges() helper, since the caller
can just free() the returned data.

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-05-22 17:59:57 -05:00
Serge Hallyn
322db32971 Don't return owner in list_owner_ranges API call.
Closes: 339

struct subordinate_range is pretty closely tied to the existing
subid code and /etc/subuid format, so it includes an owner.  Dropping
that or even renaming it is more painful than I'd first thought.
So introduce a 'struct subid_range' which is only the start and
count, leaving 'struct subordinate_range' as the owner, start and
count.

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-05-16 21:49:53 -05:00
Serge Hallyn
f9831a4a1a
Merge pull request #335 from hallyn/2021-05-08/stderr
[WIP] libsubid: don't print error messages on stderr by default
2021-05-16 21:44:22 -05:00
Serge Hallyn
2b22a6909d libsubid: don't print error messages on stderr by default
Closes #325

Add a new subid_init() function which can be used to specify the
stream on which error messages should be printed.  (If you want to
get fancy you can redirect that to memory :)  If subid_init() is
not called, use stderr.  If NULL is passed, then /dev/null will
be used.

This patch also fixes up the 'Prog', which previously had to be
defined by any program linking against libsubid.  Now, by default
in libsubid it will show (subid).  Once subid_init() is called,
it will use the first variable passed to subid_init().

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-05-15 12:38:55 -05:00
Serge Hallyn
ca1d912e6b
Merge pull request #333 from ikerexxe/hmac_crypto_algo
login.defs: include HMAC_CRYPTO_ALGO key
2021-05-08 16:35:05 -05:00
Iker Pedrosa
b8cbc2c113 login.defs: include HMAC_CRYPTO_ALGO key
Include the new HMAC_CRYPTO_ALGO key that is needed by pam_timestamp to
select the algorithm that is going to be used to calculate the message
authentication code.

pam_timestamp is currently using an embedded algorithm to calculate the
HMAC message, but the idea is to improve this behaviour by relying on
openssl's implementation. On top of that, the ability to change the
algorithm with a simple configuration change allows to simplify the
process of removing unsecure algorithms.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1947294
2021-05-06 17:31:53 +02:00
Christian Göttsche
dfe95bd08b selinux: only open selabel database once
Once opened, keep the selabel database open for further lookups.
Register an exit handler to close the database.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
2021-05-06 16:58:10 +02:00
Christian Göttsche
eb1d2de0e9 set_selinux_file_context(): prepare context for actual file type
Search the SELinux selabel database for the file type to be created.
Not specifying the file mode can cause an incorrect file context to be
returned.

Also prepare contexts in commonio_close() for the generic database
filename, not with the backup suffix appended, to ensure the desired
file context after the final rename.

Closes: #322

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
2021-05-06 16:58:10 +02:00
Christian Göttsche
5f7649fb37 selinux.c: use modern selabel interface instead of deprecated matchpathcon
matchpathcon(3) is deprecated in favor of selabel_lookup(3).

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
2021-05-06 16:58:10 +02:00
Christian Göttsche
e367d111e5 selinux.c:reset_selinux_file_context(): do not fail in permissive mode
Return 0 on setfscreatecon(3) failure, like set_selinux_file_context().

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
2021-05-06 16:58:10 +02:00
Christian Göttsche
95fd179683 selinux.c: do not use deprecated typedef and skip context translation
These retrieved contexts are just passed to libselinux functions and not
printed or otherwise made available to the outside, so a context
translation to human readable MCS/MLS labels is not needed.
(see man:setrans.conf(5))

The typedef security_context_t is deprecated, see
9eb9c93275

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
2021-05-06 16:58:10 +02:00
Christian Göttsche
6e4b2fe25d struct commonio_db[selinux]: do not use deprecated type security_context_t
The typedef security_context_t is deprecated, see
9eb9c93275

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
2021-05-06 16:58:10 +02:00
Serge Hallyn
8492dee663 subids: support nsswitch
Closes #154

When starting any operation to do with subuid delegation, check
nsswitch for a module to use.  If none is specified, then use
the traditional /etc/subuid and /etc/subgid files.

Currently only one module is supported, and there is no fallback
to the files on errors.  Several possibilities could be considered:

1. in case of connection error, fall back to files
2. in case of unknown user, also fall back to files

etc...

When non-files nss module is used, functions to edit the range
are not supported.  It may make sense to support it, but it also
may make sense to require another tool to be used.

libsubordinateio also uses the nss_ helpers.  This is how for instance
lxc could easily be converted to supporting nsswitch.

Add a set of test cases, including a dummy libsubid_zzz module.  This
hardcodes values such that:

'ubuntu' gets 200000 - 300000
'user1' gets 100000 - 165536
'error' emulates an nss module error
'unknown' emulates a user unknown to the nss module
'conn' emulates a connection error ot the nss module

Changes to libsubid:

Change the list_owner_ranges api: return a count instead of making the array
null terminated.

This is a breaking change, so bump the libsubid abi major number.

Rename free_subuid_range and free_subgid_range to ungrant_subuid_range,
because otherwise it's confusing with free_subid_ranges which frees
    memory.

Run libsubid tests in jenkins

Switch argument order in find_subid_owners

Move the db locking into subordinateio.c

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-04-16 21:02:37 -05:00
Haelwenn Monnier
b865e14f25
login & su: Treat an empty passwd field as invalid (#315)
* login & su: Treat an empty passwd field as invalid

Otherwise it's treated like the “require no password” clause while it probably
should be treated like a normal su that can't validate anyway.

A similar change should be done for USE_PAM.

* su & login: Introduce PREVENT_NO_AUTH
2021-03-28 22:16:03 -05:00
Serge Hallyn
697901a328
Merge pull request #303 from breard-r/yescrypt
Add yescrypt support
2021-03-28 22:13:56 -05:00
Martijn de Gouw
c464ec5570 newuidmap,newgidmap: Relax gid checking to allow running under alternative group ID
Signed-off-by: Martijn de Gouw <martijn.de.gouw@prodrive-technologies.com>
2021-02-08 13:32:18 +01:00
Rodolphe Bréard
5cd04d03f9 Add yescrypt support 2021-02-01 22:11:10 +01:00
ikerexxe
fb0f702cbf commonio: force lock file sync
lib/commonio.c: after writing to the lock file, force a file sync to
the storage system.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1862056
2020-11-05 17:15:56 +01:00
w00475903
e24700fd5d xfree: move xfree() function to xmalloc.c
Signed-off-by: whzhe <wanghongzhe@huawei.com>
2020-10-15 21:52:06 -04:00
Karel Zak
3f09f7b6fb getdefs: add foreign (non-shadow-utils) items
The login.defs is shared between more upstream projects (util-linux,
etc.). We need to improve compatibility between the projects do not
report valid, but foreign items.

Addresses: https://github.com/shadow-maint/shadow/issues/276
Signed-off-by: Karel Zak <kzak@redhat.com>
2020-10-08 12:30:53 +02:00
ikerexxe
87257a49a1 lib/sssd: redirect warning message to file
Instead of printing warning in stderr print it to file. This way the
user is not spammed with unnecessary messages when updating packages.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1749001
2020-10-02 16:09:42 +02:00
Serge Hallyn
d041eec354
Merge pull request #270 from darktemplarbasealt/fix_resource_leak
Fix potential resource leak in set_selinux_file_context function
2020-08-10 20:34:50 -05:00
Serge Hallyn
342c934a35 add -U option to groupadd and groupmod
Add a -U option which adds new usernames as members.  For groupmod,
also add -a (append), without which existing members are removed.

Closes #265
2020-08-09 22:11:33 -05:00
Aleksei Nikiforov
49930bd3a6 Fix potential resource leak in set_selinux_file_context function 2020-08-04 10:24:46 +03:00
Serge Hallyn
6baeb25038
Merge pull request #234 from edneville/79_userdel
Adding run-parts for userdel
2020-06-10 00:31:10 -05:00
ed
32cfa176f2 Adding run-parts style for pre and post useradd/del
Signed-off-by: ed neville <ed@s5h.net>
2020-06-10 00:26:55 -05:00
Serge Hallyn
0a7888b1fa Create a new libsubid
Closes #154

Currently this has three functions: one which returns the
list of subuid ranges for a user, one returning the subgids,
and one which frees the ranges lists.

I might be mistaken about what -disable-man means;  some of
the code suggests it means just don't re-generate them, but
not totally ignore them.  But that doesn't seem to really work,
so let's just ignore man/ when -disable-man.

Remove --disable-shared.  I'm not sure why it was there, but it stems
from long, long ago, and I suspect it comes from some ancient
toolchain bug.

Create a tests/run_some, a shorter version of run_all.  I'll
slowly add tests to this as I verify they work, then I can
work on fixing the once which don't.

Also, don't touch man/ if not -enable-man.

Changelog:
	Apr 22: change the subid list api as recomended by Dan Walsh.
	Apr 23: implement get_subid_owner
	Apr 24: implement range add/release
	Apr 25: finish tests and rebase
	May 10: make @owner const

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2020-06-07 12:11:58 -05:00
Serge Hallyn
6e6494680d trivial: drop useless version-info from libshadow_la_LDFLAGS
Signed-off-by: Serge Hallyn <serge@hallyn.com>
2020-06-07 12:07:00 -05:00
Jason Franklin
c56fe7117b
Add "NONEXISTENT" to def_table 2020-05-11 09:26:42 -04:00
Michael Vetter
992c1723af Remove unused 'buf' in shadow.c 2020-04-25 12:23:10 +02:00
Michael Vetter
8eee5d03fd Remove unused variable 'cpp' 2020-04-25 12:10:39 +02:00
Serge Hallyn
25b1a8d591 remove unused and misleading 'owner' argument from find_new_sub*
Signed-off-by: Serge Hallyn <shallyn@cisco.com>
2020-04-17 16:32:44 -05:00
Duncan Overbruck
085d04c3dd
add new HOME_MODE login.defs(5) option
This option can be used to set a separate mode for useradd(8) and
newusers(8) to create the home directories with.
If this option is not set, the current behavior of using UMASK
or the default umask is preserved.

There are many distributions that set UMASK to 077 by default just
to create home directories not readable by others and use things like
/etc/profile, bashrc or sudo configuration files to set a less
restrictive
umask. This has always resulted in bug reports because it is hard
to follow as users tend to change files like bashrc and are not about
setting the umask to counteract the umask set in /etc/login.defs.

A recent change in sudo has also resulted in many bug reports about
this. sudo now tries to respect the umask set by pam modules and on
systems where pam does not set a umask, the login.defs UMASK value is
used.
2020-01-12 16:18:32 +01:00
Serge Hallyn
93f1f35123 Revert "add new HOME_MODE login.defs(5) option"
Missing file

This reverts commit a847899b52.
2020-01-12 07:56:19 -06:00
Duncan Overbruck
a847899b52
add new HOME_MODE login.defs(5) option
This option can be used to set a separate mode for useradd(8) and
newusers(8) to create the home directories with.
If this option is not set, the current behavior of using UMASK
or the default umask is preserved.

There are many distributions that set UMASK to 077 by default just
to create home directories not readable by others and use things like
/etc/profile, bashrc or sudo configuration files to set a less
restrictive
umask. This has always resulted in bug reports because it is hard
to follow as users tend to change files like bashrc and are not about
setting the umask to counteract the umask set in /etc/login.defs.

A recent change in sudo has also resulted in many bug reports about
this. sudo now tries to respect the umask set by pam modules and on
systems where pam does not set a umask, the login.defs UMASK value is
used.
2020-01-11 22:27:39 +01:00
Michael Vetter
b1a5cda91e selinux: include stdio
We use fprintf(), stderr etc, so we should include stdio.h.
2019-12-17 13:40:47 +01:00
prez
2958bd050b Initial bcrypt support 2019-12-01 11:00:57 -06:00
Christian Göttsche
cbd2472b7c migrate to new SELinux api
Using hard-coded access vector ids is deprecated and can lead to issues with custom SELinux policies.
Switch to `selinux_check_access()`.

Also use the libselinux log callback and log if available to audit.
This makes it easier for users to catch SELinux denials.

Drop legacy shortcut logic for passwd, which avoided a SELinux check if uid 0 changes a password of a user which username equals the current SELinux user identifier.
Nowadays usernames rarely match SELinux user identifiers and the benefit of skipping a SELinux check is negligible.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
2019-10-22 14:56:31 +02:00
Serge Hallyn
a0efca4581 remove unused fn commonio_next
Signed-off-by: Serge Hallyn <shallyn@cisco.com>
2019-10-12 20:03:51 -05:00
Serge Hallyn
991fee82df
Merge pull request #180 from thkukuk/libeconf
Add support for a vendor directory and libeconf
2019-10-05 22:34:29 -05:00
Thorsten Kukuk
b52ce71c27 Add support for a vendor directory and libeconf
With this, it is possible for Linux distributors to store their
supplied default configuration files somewhere below /usr, while
/etc only contains the changes made by the user. The new option
--enable-vendordir defines where the shadow suite should additional
look for login.defs if this file is not in /etc.
libeconf is a key/value configuration file reading library, which
handles the split of configuration files in different locations
and merges them transparently for the application.
2019-10-05 22:17:49 -05:00
ed@s5h.net
1cbb562c23 lib/sgetgrent.c: change to warn when data remains 2019-10-04 18:30:41 -05:00
ed@s5h.net
558977bb2b sgetpwent.c/sgetgrent.c: check for additional data at end of line 2019-10-04 18:30:38 -05:00
Christian Brauner
a5f034f272
Merge pull request #161 from tabraham/master
lib/spawn.c run_command: don't loop forever if waitpid() is returning ECHILD
2019-06-04 13:31:08 +02:00
Thomas Abraham
82fa6eccf9 lib/spawn.c run_command: don't loop forever if waitpid() is returning ECHILD
If SIGCHILD is being ignored, waitpid() will forever error with ECHILD and
this loop with never end, so don't loop if it errors with ECHILD.
2019-05-06 14:26:14 -04:00
Thomas Abraham
8d39357c84 Revert "lib/spawn.c run_command: don't loop forever if waitpid() is returning ECHILD"
This reverts commit 1697c192ac.
2019-05-06 14:23:58 -04:00
Adam Majer
50b23584d7 Add autotools support for BtrFS option
Feature is enabled by default, if headers are available. It can be
turned off explictly.
2019-05-03 22:38:23 -07:00
Adam Majer
c1d36a8acb Add support for btrfs subvolumes for user homes
new switch added to useradd command, --btrfs-subvolume-home. When
specified *and* the filesystem is detected as btrfs, it will create a
subvolume for user's home instead of a plain directory. This is done via
`btrfs subvolume` command.  Specifying the new switch while trying to
create home on non-btrfs will result in an error.

userdel -r will handle and remove this subvolume transparently via
`btrfs subvolume` command. Previosuly this failed as you can't rmdir a
subvolume.

usermod, when moving user's home across devices, will detect if the home
is a subvolume and issue an error messages instead of copying it. Moving
user's home (as subvolume) on same btrfs works transparently.
2019-05-03 22:38:23 -07:00
Tomas Mraz
64d7688acb Do not fail locking if there is a stale lockfile.
As the lockfiles have PID in the name, there can be no conflict
in the name with other process, so there is no point in using
O_EXCL and it only can fail if there is a stale lockfile from
previous execution that crashed for some reason.
2019-05-02 14:39:01 +02:00
Tomas Mraz
408b8a5482 Use the lckpwdf() again if prefix is not set
The implementation of prefix option dropped the use of lckpwdf().
However that is incorrect as other tools manipulating the shadow passwords
such as PAM use lckpwdf() and do not know anything about the
shadow's own locking mechanism.

This reverts the implementation to use lckpwdf() if prefix option
is not used.
2019-05-02 14:33:06 +02:00
Thomas Abraham
1697c192ac lib/spawn.c run_command: don't loop forever if waitpid() is returning ECHILD
If SIGCHILD is being ignored, waitpid() will forever error with ECHILD and
this loop with never end, so don't loop if it erros with ECHILD.
2019-04-25 14:56:22 -04:00
Chris Lamb
3d921155e0 gettime: Use secure_getenv over getenv. 2019-03-31 16:00:01 +01:00
Tomas Mraz
d6276066dd Do not crash in commonio_close if database FILE not opened.
The db->fp can be NULL if commonio_unlock() is called when the
shadow file is opened but did not exist before.
2019-03-25 14:51:26 +01:00
Tomas Mraz
4633164857 login.defs: Add LASTLOG_UID_MAX variable to limit lastlog to small uids.
As the large uids are usually provided by remote user identity and
authentication service, which also provide user login tracking,
there is no need to create a huge sparse file for them on every local
machine.

fixup! login.defs: Add LASTLOG_UID_MAX variable to limit lastlog to small uids.
2018-12-10 13:25:56 -06:00
Serge Hallyn
ff8b1ebafa
Merge pull request #118 from AdelieLinux/utmpx-only-support
[WIP] Support systems that only have utmpx
2018-10-23 22:35:19 -05:00
Serge Hallyn
83f1380600
Merge pull request #133 from t8m/trivial
Fix some issues found in Coverity scan.
2018-10-23 22:21:12 -05:00
Tomas Mraz
fb97da1ce1 Fix some issues found in Coverity scan. 2018-10-10 12:22:04 +02:00
Jakub Hrozek
4aaf05d72e Flush sssd caches in addition to nscd caches
Some distributions, notably Fedora, have the following order of nsswitch
modules by default:
    passwd: sss files
    group:  sss files

The advantage of serving local users through SSSD is that the nss_sss
module has a fast mmapped-cache that speeds up NSS lookups compared to
accessing the disk an opening the files on each NSS request.

Traditionally, this has been done with the help of nscd, but using nscd
in parallel with sssd is cumbersome, as both SSSD and nscd use their own
independent caching, so using nscd in setups where sssd is also serving
users from some remote domain (LDAP, AD, ...) can result in a bit of
unpredictability.

More details about why Fedora chose to use sss before files can be found
on e.g.:
    https://fedoraproject.org//wiki/Changes/SSSDCacheForLocalUsers
or:
    https://docs.pagure.org/SSSD.sssd/design_pages/files_provider.html

Now, even though sssd watches the passwd and group files with the help
of inotify, there can still be a small window where someone requests a
user or a group, finds that it doesn't exist, adds the entry and checks
again. Without some support in shadow-utils that would explicitly drop
the sssd caches, the inotify watch can fire a little late, so a
combination of commands like this:
    getent passwd user || useradd user; getent passwd user
can result in the second getent passwd not finding the newly added user
as the racy behaviour might still return the cached negative hit from
the first getent passwd.

This patch more or less copies the already existing support that
shadow-utils had for dropping nscd caches, except using the "sss_cache"
tool that sssd ships.
2018-09-13 14:20:02 +02:00
A. Wilcox
99dbd4b9ee
Support systems that only have utmpx
This allows shadow-utils to build on systems like Adélie, which have no
<utmp.h> header or `struct utmp`.  We use a <utmpx.h>-based daemon,
utmps[1], which uses `struct utmpx` only.

Tested both `login` and `logoutd` with utmps and both work correctly.

[1]: http://skarnet.org/software/utmps/
2018-06-24 00:13:12 -05:00
fariouche
65b4f58703 add --prefix option: some fixes + fixed pwd.lock file location 2018-03-28 21:14:12 +02:00
fariouche
54551c7d6e Merge remote-tracking branch 'upstream/master' 2018-03-28 21:11:36 +02:00
fariouche
acaed3deab upstream merge 2018-01-23 23:10:19 +01:00
Josh Soref
ea1a6e814b spelling: success 2017-10-22 21:23:13 +00:00
Josh Soref
57cb36333b spelling: queried 2017-10-22 21:05:52 +00:00
Josh Soref
414816064f spelling: match 2017-10-22 20:33:00 +00:00
Josh Soref
74fcf6f28d spelling: interactive 2017-10-22 20:24:32 +00:00
Josh Soref
452b9c26e4 spelling: categories 2017-10-22 08:08:07 +00:00
Chris Lamb
cb610d54b4 Make the sp_lstchg shadow field reproducible.
The third field in the /etc/shadow file (sp_lstchg) contains the date of
the last password change expressed as the number of days since Jan 1, 1970.
As this is a relative time, creating a user today will result in:

   username:17238:0:99999:7:::

whilst creating the same user tomorrow will result in:

    username:17239:0:99999:7:::

This has an impact for the Reproducible Builds[0] project where we aim to
be independent of as many elements the build environment as possible,
including the current date.

This patch changes the behaviour to use the SOURCE_DATE_EPOCH[1]
environment variable (instead of Jan 1, 1970) if valid.

 [0] https://reproducible-builds.org/
 [1] https://reproducible-builds.org/specs/source-date-epoch/

Signed-off-by: Chris Lamb <lamby@debian.org>
2017-04-10 22:29:21 +01:00
Tomas Mraz
954e3d2e71 Fix buffer overflow if NULL line is present in db.
If ptr->line == NULL for an entry, the first cycle will exit,
but the second one will happily write past entries buffer.
We actually do not want to exit the first cycle prematurely
on ptr->line == NULL.
Signed-off-by: Tomas Mraz <tmraz@fedoraproject.org>
2017-03-31 16:25:06 +02:00
fariouche
b6b2c756c9 add --prefix option 2017-03-01 22:51:09 +01:00
Bernhard Rosenkränzer
c33ceddc26 Don't crash on bogus keys in login.defs if PAM is enabled
Without this patch, PAM enabled builds crash when encountering an
invalid key in login.defs or key overrides because of array overflows

To reproduce, simply
	useradd -K Windows=broken

Signed-off-by: Bernhard Rosenkränzer <bero@lindev.ch>
Signed-off-by: Serge Hallyn <serge@hallyn.com>
2017-01-29 14:47:24 -06:00
Serge Hallyn
5701e147ef Update _COMMONIO_H and _SHADOWIO_H to drop leading underscore
Closes #23

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2016-12-21 12:45:50 -06:00
Mike Frysinger
32c0b283ef include getdef.h for getdef_bool prototype
Otherwise we get build warnings like:
sgroupio.c:255:6: warning: implicit declaration of function 'getdef_bool' [-Wimplicit-function-declaration]
shadowio.c:131:6: warning: implicit declaration of function 'getdef_bool' [-Wimplicit-function-declaration]
2016-12-05 17:15:29 -05:00
Tomas Mraz
6401c5b4ee snprintf() always terminates output with \0 2016-11-15 16:05:44 +01:00
Tomas Mraz
4471e5419d Keep the permissions of the original file when creating a backup. 2016-11-15 16:04:24 +01:00
Sebastian Krahmer
1d5a926cc2 Simplify getulong
Use strtoul to read an unsigned long, rather than reading
a signed long long and casting it.

https://bugzilla.suse.com/show_bug.cgi?id=979282
2016-08-03 11:51:07 -05:00
Serge Hallyn
e01bad7d3c Merge pull request #4 from xnox/master
Make shadow more robust in hostile environments
2015-11-12 23:07:29 -06:00
Tobias Stoeckmann
c17f5ec460 Free memory on error path
When multiple entries with the same name are encountered, nentry is
not properly freed, which results in a memory leak.
2015-07-12 14:30:32 +02:00
Tobias Stoeckmann
df5dafe049 Clear passwords on __gr_dup/__pw_dup errors.
The functions __gr_dup and __pw_dup do not explicitly zero the
memory which hold the passwords after free. The gr_free and pw_free
functions do this explicitly.

To guarantee same behaviour, it's possible to call these *_free
functions directly from __*_dup, because the memory is initialized
with zeros at the beginning. Calling free(NULL) has no negative
effect and can be considered safe these days.
2015-07-11 13:00:13 +02:00
Dimitri John Ledkov
bab349b46e
Create dbs with correct permissions. 2015-02-27 17:01:31 +00:00
Dimitri John Ledkov
46a72bc342
Force use shadow, even if missing. 2015-02-27 17:01:30 +00:00
Dimitri John Ledkov
71c6165dcd
Do not report unknown settings, when compiled with PAM.
When compiled with PAM certain settings are not used, however they are
still defined in the stock login.defs file. Thus every command reports
them as "unknown setting contact administrator".

Alternative would be to parse stock login.defs and comment out/remove
settings that are not applied, when compiled with PAM.
2015-02-27 17:01:28 +00:00