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Initial revision
2000-06-21 06:10:38 +08:00
$Id$
-----------------------------
TODO:
- autoconf the modules?
- sanitize use of md5 throughout distribution.. Make a static
library for helping to develop modules that contains it and other
stuff. Also add sha-1 and ripemd-160 digest algorithms.
- once above is done. remove hacks from the secret@here module etc..
- remove prototype for gethostname in pam_access.c (Derrick)
- document PAM_INCOMPLETE changes
- verify that the PAM_INCOMPLETE interface is sensible. Can we
catch errors? should we permit item changing etc., between
pam_authenticate re-invocations?
- verify that the PAM_INCOMPLETE interface works (auth seems ok..)
- add PAM_INCOMPLETE support to modules (partially added to pam_pwdb)
- work on RFC.
- do we still need to remove openlog/closelog from modules..?
- auth and acct support in pam_cracklib, "yes, I know the password
you just typed was valid, I just don't think it was very strong..."
0.73: please submit patches for this section with actual code/doc
patches!
Relevant BUGIDs: 108845 Purpose of commit: changelog Commit summary: --------------- Documented fix for bug 108845
2000-07-05 11:36:30 +08:00
* fix to pam_unix_passwd: try repeatedly to get a lock on the password
file, instead of failing immediately (Bug 108845)
Initial revision
2000-06-21 06:10:38 +08:00
Planning to include:
- some autoconf support and other outstanding changes from Jan..
- some outstanding changes from Ben
- add in the pam_cap and pam_netid modules
0.72: Mon Dec 13 22:41:11 PST 1999
* patches from Debian (Ben Collins): pam_ftp supports event driven
conversations now; pwdb_chkpwd cleanup; pam_warn static compile fix;
user_db compiler warnings removed; debian defs file; pam_mail can
now be used as a session module
* ndbm compilation option for user_db module (fix explained by Richard Khoo)
* pam_cracklib bug fix
* packaging fixes & build from scratch stuff (Konst Bulatnikov & Frodo
Looijaard)
* -ldl appended to the libpam.so compilation make rule. (Charles Seeger)
* Red Hat security patch for pam_pwdb forwarded by Debian! (Ben
Collins. Fix provided by Andrey as it caught the problem earlier in the
code.)
* heuristic to prevent leaking filedescriptors to an agent. [This needs
to be better supported perhaps by an additional libpamc API function?]
* pam_userdb segfault fix from (Ben Collins)
* PAM draft spec extras added at request of 'sen_ml'
0.71: Sun Nov 7 20:21:19 PST 1999
* added -lc to linker pass for pam_nologin module (glibc is weird).
* various header changes to lower the number of warnings on glibc
systems (Dan Yefimov)
* merged a bunch of Debian fixes/patches/documentation (Ben Collins)
things touched: libpam (minor); doc/modules/pam_unix.sgml; pam_env
(plus docs); pam_mkhomedir (new module for new home directories on
the fly...); pam_motd (new module); pam_limits (adjust to match
docs); pam_issue (new module + doc) [Some of these were also
submitted by Thorsten Kukuk]
* small hack to lower the number of warnings that pam_client.h was
generating.
* debian and SuSE apparently can use the pam_ftp module, so
removed the obsolete comment about this from the docs. (Thorsten
Kukuk)
0.70: Fri Oct 8 22:05:30 PDT 1999
* bug fix for parsing of value=action tokens in libpam/pam_misc.c was
segfaulting (Jan Rekorajski and independently Matthew Melvin)
* numerous fixes from Thorsten Kukuk (icluding much needed fixes for
bitrot in modules and some documentation) that got included in SuSE 6.2.
* reentrancy issues in pam_unix and pam_cracklib resolved (Jan Rekorajski)
* added hosts_equiv_rootok module option to pam_rhosts module (Tim Berger)
* added comment about 'expose_account' module argument to admin and
module writers' docs (request from Michael K Johnson).
* myriad of bug fixes for libpamc - library now built by default and
works with the biomouse fingerprint scanner agent/module
(distributed separately).
0.69: Sun Aug 1 20:25:37 PDT 1999
* c++ header #ifdef'ing for pam_appl.h (Tuomo Pyhala)
* added pam_userdb module (Cristian Gafton)
* minor documentation changes
* added in revised pam_client library (libpamc). Not installed by
default yet, since the example agent/module combo is not very secure.
* glibc fixes (Thorsten Kukuk, Adam J. Richter)
0.68: Sun Jul 4 23:04:13 PDT 1999
* completely new pam_unix module from Jan Rekorajski and Stephen Langasek
* Jan Rekorajski pam_mail - support for Maildir format mailboxes
* Jan Rekorajski pam_cracklib - support for old password comparison
* Jan Rekorajski bug fix for pam_pwdb setcred reusing auth retval
* Andrey's pam_tally patch (lstat -> fstat)
* Robert Milkowski's additional pam_tally patches to **change format of
/var/log/faillog** to one from shadow-utils, add new option "per_user"
for pam_tally module, failure time logging, support for fail_line
field, and support for fail_locktime field with new option
no_lock_time.
* pam_tally: clean up the tally application too.
* Marcin Korzonek added process priority settings to pam_limits (bonus
points for adding to documentation!)
* Andrey's pam_pwdb patch (cleanup + md5 endian fubar fix)
* more binary prompt preparations (make misc conv more compatible with spec)
* modified callback hook for fail delay to be more useful with event
driven applications (changed function prototype - suspect no one
will notice). Documented this in app developer guide.
* documentation for pam_access from Tim Berger
* syntax fixes for the documentation - a long time since I've built it :*(
added some more names to the CREDITS file.
0.67: Sat Jun 19 14:01:24 PDT 1999
* [dropped libpam_client - libpamc will be in the next release and
conforms to the developing spec in doc/specs/draft-morgan-pam.raw.
Sorry if you are keeping a PAM tree in CVS. CVS is a pain for
directories, but this directory was actually not referenced by
anything so the disruption should be light.]
* updates to pam_tally from Tim
* multiple updates from Stephen Langasek to pam_unix
* pam_filter had some trouble compiling (bug report from Sridhar)
* pam_wheel now attempts to identify the wheel group for the local
system instead of blindly assuming it is gid=0. In the case that
there is no "wheel" group, we default to assuming gid=0 is what was
meant - former behavior. (courtesy of Sridhar)
* NIS+ changes to pam_unix module from Dmitry O Panov
* hopefully, a fix for redefinition of LOG_AUTHPRIV (bug report Luke
Kenneth Casson Leighton)
* fix for minor typo in pam_wheel documentation (Jacek Kopecky)
* slightly more explanation of the [x=y] pam.conf syntax in the sys
admin guide.
0.66: Mon Dec 28 20:22:23 PST 1998 <morgan@linux.kernel.org>
* Started using cvs to keep track of changes to Linux-PAM. This will
likely break some of the automated building stuff (RPMs etc..).
* security bug fix to pam_unix and pam_tally from Andrey.
* modules make file is now more automatic. It should be possible to
unpack an external module in the modules directory and have it automatically
added to the build process. Also added a modules/download-all script
that will make such downloading easier. I'm happy to receive patches to
this file, informing the distribution of places from which to enrich itself.
* removed pam_system_log stuff. Thought about it long and hard: a
bad idea. If libc cannot guarantee a thread safe syslog, it needs
to be fixed and compatibility with other PAM libraries was
unnecessarily strained.
* SAG documentation changes: Seth Chaiklin
* rhosts: problems with NIS lookup failures with the root-uid check.
As a work-around, I've partially eliminated the need for the lookup
by supplying two new arguments: no_uid_check, superuser=<username>.
As a general rule this is more pluggable, since this module might be
used as an authentication scheme for a network service that does not
need root privilege...
* authenticate retval -> setcred for pam_pwdb (likeauth arg).
* pam_pwdb event driven support
* non openlog pam_listfile logging
* BUGFIX: close filedescriptor in pam_group and pam_time (Emmanuel Galanos)
* Chris Adams' mailhash change for pam_mail module
* fixed malloc failure check in pam_handlers.c (follow up to comment
by Brad M. Garcia).
* update to _pam_compat.h (Brad M. Garcia)
* support static modules in libpam again (Brad M. Garcia)
* libpam/pam_misc.c for egcs to grok the code (Brad M. Garcia)
* added a solaris-2.5.1 defs file (revived by Derrick J Brashear)
* pam_listfile logs failed attempts
* added a comment (Michael K Johnson pointed it out) about sgml2latex
having a new syntax. I'll make it the change real when I upgrade...
* a little more text to the RFC, spelling fix from William J Buffam.
* minor changes to pam_securetty to accommodate event driven support.
0.65: Sun Apr 5 22:29:09 PDT 1998 <morgan@linux.kernel.org>
* added event driven programming extensions to libpam
- added PAM_INCOMPLETE handling to libpam/pam_dispatch.c
- added PAM_CONV_AGAIN which is a new conversation response that
should be mapped to PAM_INCOMPLETE by the module.
- ensured that the pam_get_user() function can resume
- changes to pam_strerror to accommodate above return codes
- clean up _pam_former_state at pam_end()
- ensured that former state is correctly initialized
- added resumption tests to pam_authenticate(), pam_chauthtok()
- added PAM_FAIL_DELAY item for pausing on failure
* improved _pam_macros.h so that macros can be used as single commands
(Andrey)
* reimplemented logging to avoid bad interactions with libc. Added
new functions, pam_[,v]system_log() to libpam's API. A programmer
can check for this function's availablility by checking if
HAVE_PAM_SYSTEM_LOG is #defined.
* removed the reduce conflict from pam_conv1 creation -- I can sleep
again now. :^]
* made building of static and dynamic libpam separate. This is
towards making it possible to build both under Solaris (for Derrick)
* made USE_CRACKLIB a condition in unix module (Luke Kenneth Casson Leighton)
* automated (quiet) config installation (Andrey)
0.64: Thu Feb 19 23:30:24 PST 1998 Andrew Morgan <morgan@linux.kernel.org>
* miscellaneous patches for building under Solaris (Derrick J Brashear)
* removed STATIC support from a number of module Makefiles. Notably,
these modules are those that use libpwdb and caused difficulties
satisfying the build process. (Please submit patches to fix this...;)
* reomved the union for binary packet conversations from
(_pam_types.h). This is now completely implemented in libpam_client.
* Andrey's patch for working environment variable handling in
sh_secret module.
* made the libpam_misc conversation function a bit more flexible with
respect to binary conversations.
* added top level define (DEBUG_REL) for compiling in the form of
a debugging release. I use this on a Red Hat 4.2 system with little
chance of crashing the system as a whole. (Andrey has another
implementation of this -- with a spec file to match..)
0.63: Wed Jan 28 22:55:30 PST 1998 Andrew Morgan <morgan@linux.kernel.org>
* added libpam_client "convention" library. This makes explicit the
use of PAM_BINARY_PROMPT. It is a first cut, so don't take it too
seriously yet. Comments/suggestions for improvements are very
welcome. Note, this library does not compile by default. It will
be enabled when it is judged stable. The library comes with two
module/agent pairs and can be used with ssh using a patch available
from my pre-release directory [where you got this file.]
* backward compatibility patch for libpam/pam_handlers.c (PAM_IGNORE
was working with neither "requistie" nor "required") and a DEBUG'ing
compile time bug with pam_dispatch.c (Savochkin Andrey Vladimirovich)
* minor Makefile change from (Savochkin Andrey Vladimirovich)
* added pam_afsauth, pam_afspass, pam_restrict, and pam_syslog hooks
(Derrick J Brashear)
* pam_access use of uname(2) problematic (security problem
highlighted by Olaf Kirch).
* pam_listfile went a bit crazy reading group membersips (problem
highlighted by Olaf Kirch and patched independently by Cristian
Gafton and Savochkin Andrey Vladimirovich)
* compatibility hooks for solaris and hpux (Derrick J Brashear)
* 64 bit Linux/alpha bug fixed in pam_rhosts (Andrew D. Isaacson)
0.62: Wed Jan 14 14:10:55 PST 1998 Andrew Morgan <morgan@linux.kernel.org>
* Derrick J Brashear's patches: adds the HP stuff missed in the first
patch; adds SunOS support; adds support for the Solaris native ld
instead of requiring gnu ld.
* last line of .rhosts file need not contain a newline. (Bug reported by
Thompson Freeman.)
0.61: Thu Jan 8 22:57:44 PST 1998 Andrew Morgan <morgan@linux.kernel.org>
* complete rewrite of the "control flag" logic. Formerly, we were
limited to four flags: requisite, required, sufficient, optional.
We can now use these keywords _and_ a great deal more besides.
The extra logic was inspired by Vipin Samar, a preliminary patch was
written by Andy Berkheimer, but I "had some ideas of my own" and
that's what I've actually included. The basic idea is to allow the
admin to custom build a control flag with a series of token=value
pairs inside square brackets. Eg., '[default=die success=ok]' which
is pretty close to a synonym for 'requisite'. I'll try to document it
better in the sys-admin guide but I'm pretty sure it is a change for
the better.... If what is in the sys-admin guide is not good enough
for you, just take a look at the source for libpam ;^)
0.59: Thu Jan 8 22:27:22 PST 1998 Andrew Morgan <morgan@linux.kernel.org>
* better handling of empty lines in .rhosts file. (Formerly, we asked
the nameserver about them!) Fix from Hugh Daschbach.
* _broke_some_binary_compatibility_ with previous versions to become
compliant with X/Open's XSSO spec. Specifically, this has been
by changing the prototype for pam_strerror().
* altered the convention for the conversation mechanism to agree
with that of Sun. (number of responses 'now=' number of messages
with help from Cristian for finding a bug.. Cristian also found a
nasty speradic segfault bug -- Thanks!)
* added NIS+ support to pam_unix_*
* fixed a "regular file checking" problem with the ~/.rhosts sanity
check. Added "privategroup" option to permit group write permission
on the ~/.rhosts file in the case that the group owner has the same
name as the authenticating user. :*) "promiscuous" and "suppress"
were not usable!
* added glibc compatibility to pam_rhosts_auth (protected __USE_MISC
with #ifndef since my libc already defines it!).
* Security fix from Savochkin Andrey Vladimirovich with suggested
modification from Olaf Seibert.
* preC contains mostly code clean-ups and a number of changes to
_pam_macros.
0.58: whenever
* pam_getenvlist() has a more robust definition (XSSO) than was previously
thought. It would seem that we no longer need pam_misc_copy_env()
which was there to provide the robustness that pam_getenvlist()
lacked before...
Accordingly, I have REMOVED the prototype from libpam_misc. (The
function, however, will remain in the library as a wrapper for
legacy apps, but will likely be removed from libpam_misc-1.0.) PLEASE
FIX YOUR APPS *BEFORE* WE GET THERE!
* Alexy Nogin reported garbage output from pam_env in the case of
a non-existent environment variable.
* 'fixed' pwdb compilation for pam_wheel. Not very cleanly
done.. Mmmm. Should really clean up the entire source tree...
* added prototypes for mapping functions
<**WARNING**>
various constants have had there names changed. Numerical values have
been retained but be aware some source old modules/applications will
need to be fixed before recompilation.
</**WARNING**>
* appended documentation to README for pam_rhosts module (Nicolai
Langfeldt).
* verified X/Open compatibility of header files - note, where we differ
it is at the level of compilation warnings and the use of 'const char *'
instead of 'char *'. Previously, Sun(X/open) have revised their spec
to be more 'const'-ervative in the light of comments from Linux-PAM
development.
* Ooops! PAM_AUTHTOKEN_REQD should have been PAM_NEW_AUTHTOK_REQD.
changed: pam_pwdb(pam_unix_acct) (also bug fix for
_shadow_acct_mgmt_exp() return value), pam_stress,
libpam/pam_dispatch, blank, xsh.
* New: PAM_AUTHTOK_EXPIRED - password has expired.
* Ooops! PAM_CRED_ESTABLISH (etc.) should have been PAM_ESTABLISH_CRED
etc... (changed - this may break some people's modules - PLEASE TAKE
NOTE!)
changed: pam_group, pam_mail, blank, xsh; module and appl
docs, pam_setcred manual page.
* renamed internal _pam_handle structure to be pam_handle as per XSSO.
* added PAM_RADIO_TYPE (for multiple choice input method). Also
added PAM_BINARY_{MSG,PROMPT} (for interaction out of sight of user
- this could be used for RSA type authentication but is currently
just there for experimental purposes). The _BINARY_ types are now
usable with hooks in the libpam_misc conversation function. Still
have to add PAM_RADIO_TYPE.
* added pam_access module (Alexei Nogin)
* added documentation for pam_lastlog. Also modified the module to
not (by default) print "welcome to your new account" when it cannot
find a utmp entry for the user (you can turn this on with the
"never" argument).
* small correction to the pam_fail_delay manual page. Either the appl or
the modules header file will prototype this function.
* added "bigcrypt" (DEC's C2) algorithm(0) to pam_pwdb. (Andy Phillips)
* *BSD tweaking for various #include's etc. (pam_lastlog, pam_rhosts,
pam_wheel, libpam/pam_handlers). (Michael Smith)
* added configuration directory $SCONFIGED for module specific
configuration files.
* added two new "linked" man pages (pam.conf(8) and pam.d(8))
* included a reasonable default for /etc/pam.conf (which can be
translated to /etc/pam.d/* files with the pam_conv1 binary)
* fixed the names of the new configuration files in
conf/pam_conv1/pam_conv.y
* fixed make check.
* pam_lastlog fixed to handle UID in virgin part of /var/log/lastlog
(bug report from Ronald Wahl).
* grammar fix in pam_cracklib
* segfault avoided in pam_pwdb (getting user). Updating of passwords
that are directed to a "new" database are more robust now (bug noted
by Michael K. Johnson). Added "unix" module argument for migrating
passwords from another database to /etc/passwd. (documentation
updated). Removed "bad username []" warning for empty passwords -
on again if you supply the 'debug' module argument.
* ctrl-D respected in conversation function (libpam_misc)
* Removed -DPAM_FAIL_DELAY_ON from top-level Makefile. Nothing in
the distribution uses it. I guess this change happened a while
back, basically I'm trying to make the module parts of the
distribution "source compatible" with the RFC definition of PAM.
This implementation of PAM is a superset of that definition. I have
added the following symbols to the Linux-PAM header files:
PAM_DATA_SILENT (see _pam_types.h)
HAVE_PAM_FAIL_DELAY (see _pam_types.h)
PAM_DATA_REPLACE (see _pam_modules.h)
Any module (or application) that wants to utilize these features,
should check (#ifdef) for these tokens before using the associated
functionality. (Credit to Michael K. Johnson for pointing out my
earlier omission: not documenting this change :*)
* first stab at making modules more independent of full library
source. Modules converted:
pam_deny
pam_permit
pam_lastlog
pam_pwdb
* pam_env.c: #include <errno.h> added to ease GNU libc use. (Michael
K. Johnson)
* pam_unix_passwd fixes to shadow aging code (Eliot Frank)
* added README for pam_tally
0.57: Fri Apr 4 23:00:45 PST 1997 Andrew Morgan <morgan@parc.power.net>
* added "nodelay" argument to pam_pwdb. This can be used to turn off
the call to pam_fail_delay that takes effect when the user fails to
authenticate themself.
* added "suppress" argument to pam_rhosts_auth module. This will stop
printing the "rlogin failure message" when the user does not have a
.rhosts file.
* Extra fixes for FAKEROOT in Makefiles (Savochkin Andrey
Vladimirovich)
* pam_tally added to tree courtesy of Tim Baverstock
* pam_rhosts_auth was failing to read NFS mounted .rhosts
files. (Fixed by Peter Allgeyer). Refixed and further enhanced
(netgroups) by Nicolai Langfeldt. [Credit also to G.Wilford for some
changes that were not actually included..]
* optional (#ifdef PAM_READ_BOTH_CONFS) support for parsing of pam.d/
AND pam.conf files (Elliot Lee).
* Added (and signed) Cristian's PGP key. (I've never met him, but I am
convinced the key belongs to the guy that is making the PAM rpms and
also producing libpwdb. Please note, I will not be signing anyone
else's key without a personal introduction..)
* fixed erroneous syslog warning in pam_listfile (Savochkin Andrey
Vladimirovich, whole file reformatted by Cristian)
* modified pam_securetty to return PAM_IGNORE in the case that the user's
name is not known to the system (was previously, PAM_USER_UNKNOWN). The
Rationale is that pam_securetty's sole purpose is to prevent superuser
login anywhere other than at the console. It is not its concern that the
user is unknown - only that they are _not_ root. Returning
PAM_IGNORE, however, insures that the pam_securetty can never be used to
"authenticate" a non-existent user. (Cristian Gafton with bug report from
Roger Hu)
* Modified pam_nologin to display the no-login message when the user
is not known. The return value in this case is still PAM_USER_UNKNOWN.
(Bug report from Cristian Gafton)
* Added NEED_LCKPWD for pam_unix/ This is used to define the locking
functions and should only be turned on if you don't have them in
your libc.
* tidied up pam_lastlog and pam_pwdb: removed function that was never used.
* Note for package maintainers: I have added $(FAKEROOT) to the list of
environment variables. This should help greatly when you build PAM
in a subdirectory. I've gone through the tree and tried to make
everything compatible with it.
* added pam_env (courtesy of Dave Kinchlea)
* removed pam_passwd+ from the tree. It has not been maintained in a
long time and running a shell script was basically insecure. I've
indicated where you can pick up the source if you want it.
* #define HAVE_PAM_FAIL_DELAY . Applications can conditionally compile
with this if they want to see if the facility is available. It is
now always available. (corresponding compilation cleanups..)
* _pam_sanitize() added to pam_misc. It purges the PAM_AUTHTOK and
PAM_OLDAUTHTOK items. (calls replaced in pam_auth and pam_password)
* pam_rhosts now knows about the '+' entry. Since I think this is a
dangerous thing, I have required that the sysadmin supply the
"promiscuous" flag for it in the corresponding configuration file
before it will work.
* FULL_LINUX_PAM_SOURCE_TREE exported from the top level make file.
If you want to build a module, you can test for this to determine if
it should take its directions from above or supply default locations
for installation. Etc.
0.56: Sat Feb 15 12:21:01 PST 1997 <morgan@parc.power.net>
* pam_handlers.c can now interpret the pam.d/ service config tree:
- if /etc/pam.d/ exists /etc/pam.conf is IGNORED
(otherwise /etc/pam.conf is treated as before)
- given /etc/pam.d/
. config files are named (in lower case) by service-name
. config files have same syntax as /etc/pam.conf except
that the "service-name" field is not present. (there
are thus three manditory fields (and arguments are
optional):
module-type control-flag module-path optional-args...
)
* included conf/pam_conv1 for converting pam.conf to a pam.d/ version
1.0 directory tree. This program reads a pam.conf file on the
standard input stream and creates ./pam.d/ (in the local directory)
and fills it with ./pam.d/"service-name" files.
*> Note: It will fail if ./pam.d/ already exists.
PLEASE REPORT ANY BUGS WITH THIS CONVERSION PROGRAM... It currently
cannot retain comments from the old conf file, so take care to do this
by hand. Also, please email me with the fix that makes the
shift/reduce conflict go away...
* Added default module path to libpam for modules (see pam_handlers.c)
it makes use of Makfile defined symbol: DEFAULT_MODULE_PATH which is
inhereted from the defs/* variable $(SECUREDIR). Removed module
paths from the sample pam.conf file as they are no longer needed.
* pam_pwdb can now verify read protected passwords when it is not run
by root. This is via a helper binary that is setuid root.
* pam_permit now prompts for a username if it is not already determined
* pam_rhosts now honors "debug" and no longer hardwire's "root" as the
superuser's name.
* pam_securetty now honors the "debug" flag
* trouble parsing extra spaces fixed in pam_time and pam_group
* added Michael K. Johnson's PGP key to the pgp.keys.asc list
* pam_end->env not being free()'d: fixed
* manuals relocated to section 3
* fixed bug in pam_mail.c, and enhanced to recognize '~' as a prefix
to indicate the $HOME of the user (courtesy David
Kinchlea). *Changed* from a "session" module to an "auth"
module. It cannot be used to authenticate a user, but it can be used
in setting credentials.
* fixed a stupid bug in pam_warn.. Only PAM_SERVICE was being read :*(
* pam_radius rewritten to exclusively make use of libpwdb. (minor fix
to Makefile for cleaning up - AGM)
* pam_limits extended to limit the total number of logins on a system
at any given time.
* libpam and libpam_misc use $(MAJOR_REL) and $(MINOR_REL) to set their
version numbers [defined in top level makefile]
* bugfix in sed command in defs/redhat.defs (AGM's fault)
* The following was related to a possibility of buffer overruns in
the syslogging code: removed fixed length array from syslogging
function in the following modules [capitalized the log identifier
so the sysadmin can "know" these are fixed on the local system],
pam_ftp, pam_stress, pam_rootok, pam_securetty,
pam_listfile, pam_shells, pam_warn, pam_lastlog
and
pam_unix_passwd (where it was definitely _not_ exploitable)
0.55: Sat Jan 4 14:43:02 PST 1997, Andrew Morgan <morgan@parc.power.net>
* added "requisite" control_flag to /etc/pam.conf syntax. [See
Sys. Admin. Guide for explanation] changes to pam_handlers.c
* completely new handling of garbled pam.conf lines. The modus
operandi now is to assume that any errors in the line are minor.
Errors of this sort should *most definitely* lead to the module
failing, however, just ignoring the line (as was the case
previously) can lead to gaping security holes(! Not foreseen by the
RFC). The "motivation" for the RFC's comments about ignoring garbled
lines is present in spirit in the new code: basically a garbled line
is treated like an instance of the pam_deny.so module.
changes to pam_handlers.c and pam_dispatch.c .
* patched libpam, to (a) call _pam_init_handlers from pam_start() and
(b) to log a text error if there are no modules defined for a given
service when a call to a module is requested. [pam_start() and
pam_dispatch() were changed].
* patched pam_securetty to deal with "/dev/" prefix on PAM_TTY item.
* reorganized the modules/Makefile to include *ALL* modules. It is now
the responsibility of the modules themselves to test whether they can
be compiled locally or not.
* modified pam_group to add to the getgroups() list rather than overwrite
it. [In the case of "HAVE_LIBPWDB" we use the pwdb_..() calls to
translate the group names.]. Module now pays attention to
PAM_CRED_.. flag(!)
* identified and removed bugs in field reading code of pam_time and
(thus) pam_group.
* Cristian's patches to pam_listfile module, corresponding change to
documentation.
* I've discovered &ero; for sgml!
Added pam_time documentation to the admin guide.
* added manual pages: pam.8, pam_start.2(=pam_end.2),
pam_authenticate.2, pam_setcred.2, pam_strerror.2,
pam_open_session.2(=pam_close_session.2) and pam_chauthtok.2 .
* added new modules:
- pam_mail (tells the user if they have any new mail
and sets their MAIL env variable)
- pam_lastlog (reports on the last time this user called
this module)
* new module hooks provided.
* added a timeout feature to the conversation function in
libpam_misc. Documented it in the application developers' guide.
* fixed bug in pam_misc_paste_env() function..
* slight modifications to wheel and rhosts writeup.
* more security issues added to module and application guides.
--
Things present but not mentioned in previous release (sorry)
* pam_pwdb module now resets the "last_change" entry before updating a
password.
--
Sat Nov 30 19:30:20 PST 1996, Andrew Morgan <morgan@parc.power.net>
* added environment handling to libpam. involved change to _pam_types.h
also added supplementary functions to libpam_misc
* added pam_radius - Cristian
* slight speed up for pam_rhosts
* significantly enhanced sys-admin documentation (8 p -> 41 p in
PostScript). Added to other documentation too. Mostly the changes
in the other docs concern the new PAM-environment support, there is
also some coverage of libpam_misc in the App. Developers' guide.
* Cristian's patches to pam_limits and pam_pwdb. Fixing bugs. (MORE added)
* adopted Cristian's _pam_macros.h file to help with common macros and
debugging stuff, gone through tree tidying up debugging lines to use
this [not complete].
- for consistency replaced DROP() with _pam_drop()
* commented memory debugging in top level makefile
* added the following modules
- pam_warn log information to syslog(3) about service application
- pam_ftp if user is 'ftp' then set PAM_RUSER/PAM_RHOST with password
(comment about nologin added to last release's notes)
* modified the pam_listfile module. It now declares a meaningful static
structure name.
Sun Nov 10 13:26:39 PST 1996, Andrew Morgan <morgan@parc.power.net>
**PLEASE *RE*AMEND YOUR PERSONAL LINKS**
-------> http://parc.power.net/morgan/Linux-PAM/index.html <-------
**PLEASE *RE*AMEND YOUR PERSONAL LINKS**
A brief summary of what has changed:
* many modules have been modified to accomodate fixing the pam_get_user()
change. Please take note if you have a module in this distribution.
* pam_unix is now the pam_unix that Red Hat has been using and which
should be fairly well debugged.
- I've added some #ifdef's to make it compile for me, and also
updated it with respect to the libpam-0.53, so have a look at the
.../modules/pam_unix/Makefile to enable cracklib and shadow features
** BECAUSE OF THIS, I cannot guarantee this code works as it **
** did for Red Hat. Please test and report any problems. **
* the pam_unix of .52 (renamed to pam_pwdb) has been enhanced and made
more flexible with by implementing it with respect to the new
"Password Database Library" see
http://parc.power.net/morgan/libpwdb/index.html
modules included in this release that require this library to
function are the following:
- pam_pwdb (ne pam_unix-0.52 + some enhancements)
- pam_wheel
- pam_limits
- pam_nologin
* Added some optional code for memory debugging. In order to support
this you have to enable MEMORY_DEBUG in the top level makefile and
also #define MEMORY_DEBUG in your applications when they are compiled.
The extra code resides in libpam (compiled if MEMORY_DEBUG is defined)
and the macros for malloc etc. are to be found at the end of
_pam_types.h
* used above code to locate two memory leaks in pam_unix module and two
in libpam (pam_handlers.h)
* pam_get_user() now sets the PAM_USER item. After reading the Sun
manual page again, it was clear that it should do this. Various
modules have been assuming this and now I have modified most of them
to account for this change. Additionally, pam_get_user() is now
located in the module include file; modules are supposed to be the
ones that use it(!) [Note, this is explicitly contrary to the Sun
manual page, but in the spirit of the Linux distribution to date.]
* replaced -D"LINUX" with -D"LINUX_PAM" as this is more explicit and less
likely to be confused with -D"linux".
Also, modified the libpam #include files to behave more like the Sun
ones #ifndef LINUX_PAM.
* removed <bf/ .. / from documentation titles. This was not giving
politically correct html..
----- My vvvvvvvvvvvvvvvvvvv was a long time ago ;*] -----
Wed Sep 4 23:57:19 PDT 1996 (Andrew Morgan <morgan@physics.ucla.edu>
0. Before I begin, Linux-PAM has a new primary distribution site (kindly
donated by Power Net Inc., Los Angeles)
**PLEASE AMMEND YOUR PERSONAL LINKS**
-------> http://www.power.net/morgan/Linux-PAM <-------
**PLEASE AMMEND YOUR PERSONAL LINKS**
1. I'm hoping to make the next release a bug-fix release... So please find
all the bugs(! ;^)
2. here are the changes for .52:
* minor changes to module documentation [Incidently, it is now
available on-line from the WWW page above]. More changes to follow in
the next two releases. PLEASE EMAIL me or the list if there is
anything that isn't clear!
* completely changed the unix module. Now a single module for all four
management groups (this meant that I could define all functions as
static that were not part of the pam_sm_... scheme. AGM)
- Shadow support added
PASSWD - Elliot's account management included, and enhanced by Cristian Gafton.
- MD5 password support added by Cristian Gafton.
- maxtries for authentication now enforced.
- Password changing function in pam_unix now works!
Although obviously, I'm not going to *guarantee* it ;^) .
- stole Marek's locking code from the Red Hat unix module.
[ If you like you can #ifdef it in or out ... ]
You can configure the module more from its Makefile in
0.52/modules/pam_unix/
If you are nervous that it will destroy your /etc/passwd or shadow
files then EDIT the 0.52/modules/pam_unix/pam_unix_pass.-c file.
Here is the warning comment from this file...
-------------8<-----------------
/* <WARNING>
*
* Uncomment the following #define if you are paranoid, and do not
* want to risk losing your /etc/passwd or shadow files.
* It works for me (AGM) but there are no guarantees.
*
* </WARNING>
*/
/* #define TMP__FILE */
------------->8-----------------
*** If anyone has any trouble, please *say*. Your problem will be
fixed in the next release. Also please feel free to scour the
code for race conditions etc...
[* The above change requires that you purge your /usr/lib/security
directory of the old pam_unix_XXX.so modules: they will NOT be deleted
with a 'make remove'.]
* the prototype for the cleanup function supplied to pam_set_data used
to return "int". According to Sun it should be "void". CHANGED.
* added some definitions for the 'error_status' mask values that are
passed to the cleanup function associated with each
module-data-item. These numbers were needed to keep up with changing
a data item (see for example the code in pam_unix/support.-c that
manages the maximum number of retries so far). Will see what Sun says
(current indications are positive); this may be undone before 1.0 is
released. Here are the definitions (from pam_modules.h).
#define PAM_DATA_SILENT 0x40000000 /* used to suppress messages... */
#define PAM_DATA_REPLACE 0x20000000 /* used when replacing a data item */
* Changed the .../conf/pam.conf file. It now points to the new
pam_unix module for 'su' and 'passwd' [can get these as SimpleApps --
I use them for testing. A more extensive selection of applications is
available from Red Hat...]
* corrected a bug in pam_dispatch. Basically, the problem was that if
all the modules were "sufficient" then the return value for this
function was never set. The net effect was that _pam_dispatch_aux
returned success when all the sufficient modules failed. :^( I think
this is the correct fix to a problem that the Red Hat folks had
found...
sopwith* Removed advisory locking from libpam (thanks for the POSIX patch
goes to Josh Wilmes's, my apologies for not using it in the
end.). Advisory locking did not seem sufficiently secure for libpam.
Thanks to Werner Almesberger for identifying the corresponding "denial
of service attack". :*(
* related to fix, have introduced a lock file /var/lock/subsys/PAM
that can be used to indicate the system should pay attention to
advisory locking on /etc/pam.conf file. To implement this you need to
define PAM_LOCKING though. (see .52/libpam)
* modified pam_fail_delay() function. Couldn't find the "not working"
problem indicated by Michael, but modified it to do pseudo-random
delays based on the values indicated by pam_fail_delay() -- the
function "that may eventually go away"... Although Sun is warming to
the idea.
* new modules include:
pam_shells - authentication for users with a shell listed in
/etc/shells. Erik Troan <ewt@redhat.com>
pam_listfile - authentication based on the contents of files.
Set to be more general than the above in the
future. UNTESTED. Elliot Lee <@redhat.com>
[Note, this module compiles with a non-trivial
warning: AGM]
Thu Aug 8 22:32:15 PDT 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* modified makefiles to take more of their installation instructions
from the top level makefile. Desired for integration into the Debian
distribution, and generally a good idea.
* fixed memory arithmetic in pam_handlers
-- still need to track down why failure to load modules can lead to
authentication succeding..
* added tags for new modules (smartcards from Alex -- just a promise
at this stage) and a new module from Elliot Lee; pam_securetty
* I have not had time to smooth out the wrinkles with it, but Alex's
pam_unix modifications are provided in pam_unix-alex (in the modules
directory) they will not be compiled by 'make all' and I can't even
say if they do compile... I will try to look at them for .52 but, in
the mean time please feel free to study/fix/discuss what is there.
* pam_rhosts module. Removed code for manually setting the ruser
etc. This was not very secure.
* [remade .ps docs to be in letter format -- my printer complains
about a4]
Sunday July, 7 12:45:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* No longer accompanying the Linux-PAM release with apps installed.
[Will provide what was here in a separate package.. (soon)
lib Also see http://www.redhat.com/pam for some more (in .rpm form...)]
* renamed libmisc to libpam_misc. It is currently configured to only compile
the static library. For some strange reason (perhaps someone can
investigate) my Linux 2.0.0 kernel with RedHat 3.0.3 system
segfaults when I compile it to be a dynamic library. The segfault
seems to be inside the call to the ** dl_XXX ** function...!?
There is a simple flag in the libpam_misc/Makefile to turn on dynamic
compiles.
* Added a little unofficial code for delay support in libpam (will probably
disappear later..) There is some documentation for it in the pam_modules
doc now. That will obviously go too.
* rewritten pam_time to use *logic* to specify the stringing together of
users/times/terminals etc.. (what was there before was superficially
logical but basically un-predictable!)
* added pam_group. Its syntax is almost identical to pam_time but it
has another field added; a list of groups to make the user a member
of if they pass the previous tests. It seems to not co-exist too well
with the groups in the /etc/group but I hope to have that fixed by
the next release...
* minor re-formatting of pam_modules documentation
* removed ...// since it wasn't being used and didn't look like it
would be!
GCCSunday 23 22:35:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* The major change is the addition of a new module: pam_time for
restricting access on terminals at given times for indicated users
it comes with its own configuration file /etc/security/time.conf
and the sample file simply restricts 'you' from satisfying the blank
application if they try to use blank from any tty*
* Small changes include
- altered pam.conf to demonstrate above new module (try typing username: you)
- very minor changes to the docs (pam_appl and pam_modules)
Saturday June 2 01:40:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
*** PLEASE READ THE README, it has changed ***
* NOTE, 'su' exhibits a "system error", when static linking is
used. This is because the pam_unix_... module currently only has
partial static linking support. This is likely to change on Monday
June 3, when Alex makes his latest version availible. I will include
the updated module in next release.
changes for .42:
* modified the way in which libpam/pam_modules.h defines prototypes for
the pam_sm_ functions. Now the module must declare which functions it
is to provide *before* the #include <security/pam_modules.h> line.
(for contrasting examples, see the pam_deny and pam_rootok modules)
This removed the ugly hack of defining functions that are never called
to overcome warnings... This seems much tidier.
insterted* updated the TODO list. (changed mailing list address)
* updated README in .../modules to reflect modifications to static
compliation protocol
* modified the pam_modules documentation to describe this.
* corrected last argument of pam_get_item( ... ) in
pam_appl/modules.sgml, to "const void **".
* altered GNU GPL's in the documentation, and various other parts of
the distribution. *Please check* that any code you are responsible for
is corrected.
* Added ./Copyright (please check that it is acceptable)
* updated ./README to make current and indicate the new mailing list
address
* have completely rewritten pam_filter. It now runs modular filter
executables (stored in /usr/sbin/pam_filter/) This should make it
trivial for others to write their own filters.. If you want yours
included in the distribution please email the list/me.
* changes to libpam; there was a silly bug with multiple arguments on a
pam.conf line that was broken with a '\<LF>'.
* 'su' rearranged code (to make better use of PAM)
*Also* now uses POSIX signals--this should help the Alpha port.
* 'passwd' now uses getlogin() to determine who's passwords to change.
Sunday May 26 9:00:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* fixed module makefiles to create needed dynamic/static subdirectories
Saturday May 25 20:30:27.8 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* LOTS has changed regarding how the modules/libpam are built.
* Michael's mostly complete changes for static support--see below
(Andrew got a little carried away and automated the static linking
of modules---bugs are likely mine ;( )
* Thanks mostly to Michael, libpam now compiles without a single warning :^]
* made static modules/library optional.
CFLAGS* added 'make sterile' to top level makefile. This does extraclean and remove
* added Michael and Joseph to documentation credits (and a subsection for
future documentation of static module support in pam_modules.sgml)
* libpam; many changes to makefiles and also automated the inclusion of
static module objects in pam_static.c
* modified modules for automated static/dynamic support. Added static &
dynamic subdirectories, as instructed by Michael
* removed an annoying syslog message from pam_filter: "parent exited.."
* updated todo list (anyone know anything about svgalib/X? we probably should
have some support for these...)
Friday May 24 16:30:15 EDT 1996 (Michael K. Johnson <johnsonm@redhat.com>)
* Added first (incomplete) cut at static support.
This includes:
. changes in libpam, including a new file, pam_static.c
. changes to modules including exporting struct of function pointers
. static and dynamic linking can be combined
. right now, the only working combinations are just dynamic
linking and dynamic libpam.so with static modules linked
into libpam.so. That's on the list of things to fix...
. modules are built differently depending on whether they
are static or dynamic. Therefore, there are two directories
under each module directory, one for static, and one for
dynamic modules.
* Fixed random brokenness in the Makefiles. [ foo -nt bar ] is
rather redundant in a makefile, for instance. Also, passing
on the command line is broken because it cannot be
overridden in any way (even adding important parts) in lower-level
makefiles.
* Unfortunately, fixing some of the brokenness meant that I used
GNU-specific stuff. However, I *think* that there was GNU-specific
stuff already. And I think that we should just use the GNU
extensions, because any platform that GNU make doesn't port to
easily will be hard to port to anyway. It also won't be likely
passwd to handle autoconf, which was Ted's suggestion for getting
around limitations in standard make...
For now, I suggest that we just use some simple GNU-specific
extensions.
Monday May 20 22:00:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* added some text to pam_modules.sgml
* corrected Marek's name in all documentation
* made pam_stress conform to chauthtok conventions -- ie can now request
old password before proceeding.
* included Alex's latest unix module
* included Al's + password strength checking module
* included pam_rootok module
* fixed too many bugs in libpam.. all subtly related to the argument lists
or use of syslog. Added more debugging lines here too.
* fixed the pam.conf file
* deleted pam_test module. It is pretty old and basically superceeded
by pam_stress
Friday May 9 1:00:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* updated documentaion, added Al Longyear to credits and corrected the
spelling of Jeff's name(!). Most changes to pam.sgml (even added a figure!)
* new module pam_rhosts_auth (from Al Longyear)
* new apps rlogind and ftpd (a patch) from Al.
* modified 'passwd' to not call pam_authenticate (note, none of the
modules respect this convention yet!)
* fixed bug in libpam that caused trouble if the last line of a
pam.conf file ends with a module name and no newline character
* also made more compatable with documentation, in that bad lines in
pam.conf are now ignored rather than causing libpam to return an
error to the app.
* libpam now overwrites the AUTHTOKs when returning from
pam_authenticate and pam_chauthtok calls (as per Sun/RFC too)
* libpam is now installed as libpam.so.XXX in a way that ldconfig can
handle!
Wednesday May 1 22:00:00 PST 1996 (Andrew Morgan <morgan@physics.ucla.edu>)
* removed .../test directory, use .../examples from now on.
* added .../apps directory for fully functional applications
- the apps directory contains directories that actually contain the apps.
the idea is to make application compilation conditional on the presence
of the directory. Note, there are entries in the Makefile for
'login' and 'ftpd' that are ready for installation... Email me if
you want to reserve a directory name for an application you are
working on...
* similar changes to .../modules makefile [entries for pam_skey and
pam_kerberos created---awaiting the directories.] Email me if you
want to register another module...
* minor changes to docs.. Not really worth reprinting them quite yet!
[save the trees]
* added misc_conv to libmisc. it is a generic conversation function
for text based applications. [would be nice to see someone create
an Xlib and/or svgalib version]
* fixed ctrl-z/c bug with pam_filter module [try xsh with the default
pam.conf file]
* added 'required' argument to 'pam_stress' module.
* added a TODO list... other suggestions to the list please.
Saturday April 7 00:00:00 PST 1996 ( Andrew Morgan <morgan@physics.ucla.edu> )
* Alex and Marek please note I have altered _pam_auth_unix a little, to
make it get the passwords with the "proper method" (and also fixed it
to not have as many compiler warnings)
* updated the conf/pam.conf file
* added new example application examples/xsh.c (like blank but invokes
/bin/sh)
* Marc's patches for examples/blank.c (and AGM's too)
* fixed stacking of modules in libpam/pam_handlers.c
* fixed RESETing in libpam/pam_item.c
* added new module modules/pam_filter/ to demonstrate the possibility
of inserting an arbitrary filter between the terminal and the
application that could do customized logging etc... (see use of
bin/xsh as defined in conf/pam.conf)
Saturday March 16 19:00:00 PST 1996 ( Andrew Morgan <morgan@physics.ucla.edu> )
These notes are for 0.3 I don't think I've left anything important
out, but I will use emacs 'C-x v a' next time! (Thanks Jeff)
* not much has changed with the functionality of the Linux-PAM lib
.../libpam
- pam_password calls module twice with different arguments
- added const to some of the function arguments
- added PAM_MAX_MES_ to <security/_pam_types.h>
- was a lot over zealous about purging old passwords...
I have removed much of this from source to make it
more compatible with SUN.
- moved some PAM_... tokens to pam_modules.h from _pam_types.h
(no-one should notice)
* added three modules: pam_permit pam_deny pam_stress
no prizes for guessing what the first two do. The third is
a reasonably complete (functional) module. Is intended for testing
applications with.
* fixed a few pieces of examples/blank.c so that it works (with
pam_stress)
* ammended the documentation. Looking better, but suggestions/comments
very welcome!
Sunday March 10 10:50:00 PST 1996 ( Andrew Morgan <morgan@physics.ucla.edu> )
These notes are for Linux-PAM release 0.21. They cover what's changed
since I relased 0.2.
* am now using RCS
* substantially changed ./README
* fixed bug reading \\\n in pam.conf file
* small changes to documentation
* added `blank' application to ./examples (could be viewed as
a `Linux-PAM aware' application template.)
* oops. now including pam_passwd.o and pam_session.o in pamlib.so
* compute md5 checksums for all the source when making a release
- added `make check' and `make RCScheck' to compute md5 checksums
* create a second tar file with all the RCS files in.
* removed the .html and .txt docs, supplying sgml sources instead.
- see README for info on where to get .ps files
Thursday March 6 0:44:?? PST 1996 ( Andrew Morgan <morgan@physics.ucla.edu> )
These notes are for Linux-PAM release 0.2. They cover what's changed
since Marc Ewing relased 0.1.
**** Please note. All of the directories in this release have been modified
**** slightly to conform to the new pamlib. A couple of new directories have
**** been added. As well as some documentation. If some of your code
**** was in the previous release. Feel free to update it, but please
**** try to conform to the new headers and Makefiles.
* Andrew Morgan (morgan@physics.ucla.edu) is making this release
availible, Marc has been busy...!
* Marc's pam-0.1/lib has been (quietly) enhanced and integrated into
Alex Yurie's collected tree of library and module code
(linux-pam.prop.1.tar.gz). Most of the changes are to do with error
checking. Some more robustness in the reading of the pam.conf file
and the addition of the pam_get_user() function.
* The pam_*.h files have been reorganized to logically enforce the
separation of modules from applications. [Don't panic! Apart from
changing references of the form
#include "pam_appl.h"
to
#include <security/pam_appl.h>
The reorganization should be backwardly compatable (ie. a module
written for SUN will be as compatable as it was before with the
previous version ;)~ ]
(All of the source in this tree now conforms to this scheme...)
The new reorganization means that modules can be compiled with a
single header, <security/pam_modules.h>, and applications with
<security/pam_appl.h>.
* I have tried to remove all the compiler warnings from the updated
"pamlib/*.c" files. On my system, (with a slightly modified <dlfcn.h>
email me if it interests you..) there are only two warnings that
remain: they are that ansi does not permit void --> fn ptr
assignment. K&Rv2 doesn't mention this....? As a matter of principle,
if anyone knows how to get rid of that warning... please
tell. Thanks! "-pedantic"
* you can "make all" as a plain user, but
* to "make install" you must be root. The include files are placed in
/usr/include/security. The libpam.so library is installed in /usr/lib
and the modules in /usr/lib/security. The two test binaries
are installed in the Linux-PAM-0.2/bin directory and a chance is given to
replace your /etc/pam.conf file with the one in Linux-PAM-0.2/conf.
* I have included some documentation (pretty preliminary at the
moment) which I have been working on in .../doc .
I have had a little trouble with the modules, but atleast there are no
segfaults! Please try it out and discuss your results... I actually
hope it all works for you. But, Email any bugs/suggestions to the
Linux-PAM list: linux-pam@mit.edu .....
Regards,
Andrew Morgan
(morgan@physics.ucla.edu)
Sat Feb 17 17:30:24 EST 1996 (Alexander O. Yuriev alex@bach.cis.temple.edu)
* conf directory created with example of pam_conf
* stable code from pam_unix is added to modules/pam_unix
* test/test.c now requests username and password and attempts
to perform authentication
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