CHANGES

Changes from Release 0.0 to release 0.1
---------------------------------------

You must now say "default attribute = permit" instead of
default authorization = permit" when configuring service
defaults

You must now say "default svc = permit" instead of "default
authorization = permit" when configuring service defaults for a user.

When authorizing enable requests, the daemon used to prompt for a
username which it then ignored. It no longer prompts for a username.

Fix recursion issues with service and command lookups. They are now
fully recursive c.f. password lookups.

Add debugging output to password verification to provide information
about expiry processing.

Keep track of longest hash chain we create, for fine tuning. Hash all
keywords into a keyword table instead of doing linear lookup.

Update users_guide to reflect the new configuration syntax.

The convert.pl script now generates the new configuration file syntax.

Accounting code now honours the "more" flag.


Changes from Release 0.1 to release 0.2
---------------------------------------

You can now send a SIGHUP to the daemon to cause it to reinitialize
itself and re-read its CONFIG file. There is a new debugging flag
devoted to this section of the code.

Node types are now pretty-printed in debug output.

The conversion script "convert.pl" now will not print out an expires
field if it doesn't think the syntax of the field is correct. It also
now ignores blank lines in its input files.

When doing authorization, the NAS supplied attribute "cmd=" is now
correctly ignored. This would previously have caused exec
authorization to be denied.

Changes from Release 0.2 to release 0.3
---------------------------------------
Warn when not invoked as uid 0.
Improved Usage message
Add make install target

Changes from Release 0.3 to release 0.4
---------------------------------------
Add TAC_PLUS_PIDFILE to makefile per Andy Linton's suggestion.
Fix bug in authorization code (protocol field needs to be
uppercase) which prevented authorization from working.

Changes from Release 0.4 to release 0.5
---------------------------------------
Add pre and post authorization calls to shell commands.
Minor bugfixes and code cleanup
The "More" bit in accounting records is now honoured.
Fix a bug in convert.pl
Redo accounting output routines. You can now name the accounting file
in the configuration file.
Change "svc" to "service" and "proto" to "protocol".
You can use any string to name a ppp protocol, even one which doesn't yet exist.
Add PPP/LCP special case processing
Revised authorization algorithm (see user's guide)
Add hex debug flag to allow skipping hex in packet dumps.
Update user's guide to reflect changes

Changes from Release 0.4 to release 1.0
---------------------------------------
Changed format of syslog messages to make writing scripts easier
Added ability to use cleartext passwords instead of DES passwords
Updated man page to reflect the fact that we use SIGUSR1 to re-read
the config file. SIGHUP is now ignored.
Updated the users guide.

Changes from Release 1.0 to release 1.1
---------------------------------------
Release 1.1 corresponds to RCS version 1.64 of tac_plus
(see tac_plus -v)

A typo in the Solaris section of the Makefile has been fixed.

The keyword 'des' has been introduced which must be used before all
des encrypted passwords.

The keyword 'password' has been changed to 'login', so
    password = f23sac783n
has become
    login = des f23sac783n

The convert.pl script knows about these changes.

arap and chap now require the keyword 'cleartext' in front of their
passwords.

A cleartext, per-user, global password can now be configured, which
works for login, arap and chap.

The users_guide has been updated to include a list of all A/V pairs
recognised by IOS 10.3(3) code.

Some solaris binaries have been provided as a courtesy.

Changes from Release 1.1 to release 2.0
---------------------------------------
generate_password.pl has been removed in favour of a C program
generate_passwd.c

The version number reported by tac_plus has been changed to agree with the
release number. This is why the version has jumped to 2.0

skey was broken by changes made in 1.1. These are now fixed.

Documentation has been added for the authorization AV pairs supported
by IOS releases 10.3(3) and 11.0.

Changes from Release 2.0 to release 2.1
---------------------------------------
There are now Makefile definitions for most of the major platforms.

Minor changes to remove some spurious debugging output.

A prematurely closed NAS connection will now call the authentication
function with the abort flag set, so that it can do any clean up it
requires.

syslog messages will contain the string "unknown" for usernames and
ports which are NULL, so that the messages always contain a fixed
number of fields.

The authentication code has been rearranged to better reflect the
structure of the API.

The "default user = permit" directive is still accepted but is now
deprecated in favour of "default authorization = permit".

A bug in the handling of substring AV pairs which caused the attribute
"addr" to erroneously match "addr-pool" has been fixed.

Added new files: enable.c generate_passwd.c skey_fn.c

New #defines have been added to make it easier to port tacacs+ to new
systems.

Many more iterations are allowed before an error is declared.

Changes from Release 2.1 to release 2.2
---------------------------------------
The expiry field in the shadow file on Solaris machines is now
honored, if it exists.

Added TAC_PLUS_AUTHEN_SVC_NASI

Changes from Release 2.2 to release F3.0.13
-------------------------------------------
NEW REVISION OF THE PROTOCOL corresponding to tacacs+.spec.v1.63.ps
(which see) to increase security in the case of compromised keys.

Inbound pap logins and outbound pap password are now configurable as
separate entries for each principal.  Inbound pap logins are now
declared by using a "pap = " configuration directive. Outbound PAP is
now configured using "opap =".

Substantial code rearrangement of authentication routines.

Cleartext passwords can be up to 255 characters in length (previously
only the first 8 characters were used).

default service = permit is now fully recursive and now allows you to
say default service = deny in case you belong to a group where the
default is to permit.

Include backward compatibility with old revision of the protocol
(prior to v1.63).

post_authorization scripts are now invoked for command authorization.

Better sanity checking of authorization and accounting packets.

The API has changed slightly. All character string fields in the
identity structure are now allocated from the heap and can be up to
255 bytes long (instead of being character arrays of 32 and 64 bytes,
as specified in the API document revision 1.30 or earlier).

Double quotes can now appear inside strings if they are escaped with a
backslash.

Added code which limits the number of simultaneous sessions a user can
have (see MAXSESS in the user's guide).

The accounting "more" bit is gone (It was deprecated from the spec).

Hooks are now in so that if you have DES code, you can do ARAP more
securely, per the new protocol.

The packet read/write routines now handle exceptions more gracefully.

Lots of stuff added to the user's guide.

If you use a port number other than the default, the pidfile has the
port number appended to it, in case you are running multiple daemons.
We also now remove the pidfile when the daemon terminates via SIGTERM.

user = DEFAULT has been added, deprecating "default authorization =
permit". See the user's guide.

Arbitrary service types can now be configured in the config file.

REARMSIGNAL has been added for those systems which install one-shot
signal handlers which need to be rearmed after use (LINUX, HPUX).

A \n can now be embedded within strings.

Concede defeat. Allow SIGHUP as synonym for SIGUSR1.

Avoid symbol buffer overflow by checking the maximum length of a
string or token.

Make peer DNS lookup on incoming connections optional.

Do not close socket when servicing a SIGHUP

Fix a bad bug where service/cmd declarations which were not contiguous
were parsed but ignored (reported by Gabor Kiss).

Patch maxsessions to not count the current port on a different
NAS. Add various other fixes to maxsession code.

Add timeout to finger read routine.

Changes from release F3.0.13 to F4.0.1
-------------------------------------------
Added MSCHAP routines

CSCdi37706 exposed a bug in command authorization on the daemon.
Change assemble_args so it returns "" if there are no command
arguments.

Changes from release F4.0.1 to F4.0.2
-------------------------------------------
Fix fseek problem in maxsess code

Changes from release F4.0.2 to F4.0.3
-------------------------------------------
Add option for wtmp file logging in accounting
Added -DGLIBC for Linux.
Support PAP with des encrypted passwords
Support a return code of 3 for external authorization scripts

Changes from release F4.0.3 to F4.0.4
-------------------------------------------
merge F4.0.4 changes from disaster.com

F4.0.4.1
	- {log,pid}file permissions fixes	- partically from ian freislich
	- add bind address (-B) option - partically from ian freislich
	- fix pidfile removal on exit

F4.0.4.2
	- partial autoconf setup - much more to be done
	- compile option IGN_HUP (ignore HUP signal) is history
	- rename generated_password -> tac_pwd and add manpage
	- rename tac_plus.1 -> tac_plus.8
	- add tac_plus.confg.5
	- add -h option to display usage info

F4.0.4.3
	- comment out the unnecessary lex and yacc tests from autoconf

F4.0.4.4
	- added more autoconf stuff
	- fix-up tac_plus.8 manpage - still need to do autoconf-time option
	  replacement
	- fix-up tac_plus.conf manpage - incomplete
	- fix-up tac_plus help message
	- whitespace and formatting nits
	- port host clause (minus type keyword) from devrim seral's tac_plus v9
	  (http://www.gazi.edu.tr/tacacs/) at user request
	- changed user-specific enable password handling such that it if one
	  is specified for the user, the daemon does not check the host-specific
	  or global enable password.
	- make TACPLUS_ACCTFILE, TACPLUS_PIDFILE, and TACPLUS_LOGFILE autoconf
	  knobs filling in pathsl.h and appopriate bits in manpages
	- separated the frequently asked questions portion of the user_guide
	  into the file FAQ
	- OR successive -d (debug) options
	- fix md5 for LP64
F4.0.4.5
	- use C99 stdint.h for int types
	- linux's libwrap needs libnsl
	- variable index in md5.c conflicts with index()
F4.0.4.6
	- fix a few compiler warnings
	- add -e and -h options to tac_pwd
	- include crypt.h if it exists (solaris)
	- make configure options --with-{user,group}id work
F4.0.4.7
	- make configure option --with-skey work
	- raise a few logs from INFO to NOTICE, to allow syslogd filtering of
	  some rather noisey logs
	- add ACL checking for authorization, for the case where tacacs is only
	  used for authorization.
F4.0.4.8
	- if -B is used, add the bind address in the PID filename - from
	  Ian Dickinson
	- "acl" is an AV pair for service exec.  Within service attribute
	  parsing, do not parse "acl" as the acl (or connection ACL) keyword.
	  This is a hack; the parser is rather lame - noted by Bryce Kahle
	- fix md4 for LP64
	- do not accept skey keywords unless compiled with skey support
	- fix skey enable password type - bit from Ed Ravin
	- skey prompt ("challenge") is "S/Key challenge", not "Password"
	- make "daemon" the default syslog facility and add a syslog config
	  statement
	- add support for user authentication via PAM

F4.0.4.9
	- clean-up bogus nopasswd_str protoypes that gcc4 did not like

F4.0.4.10
	- Fix PAM for linux, which does not offer PAM_AUTHOK for pam_set_item()
	  and requires a pam_conv function even with PAM_SILENT - reported and
	  tested by Stefan Oettl

F4.0.4.11
	- Fix OS X and build problems and do not prototype errno - from
	  Georg Schwarz

F4.0.4.12
	- Fix typo in usage message - from Georg Schwarz
	- Various tac_plus.conf.5 fixes - from Georg Schwarz
	- escape the escape backslash of the ACL examples - from Georg Schwarz
	- Fix a LP64 bug where VALUE (union v) consisting of pointer was
	  intialized like an int - reported by brad dreisbach

F4.0.4.13
	- Rename convert.pl to tac_convert and install it
	- install users_guide

F4.0.4.14
	- Add notes about PAM to the user guide and tac_plus.conf(5)
	- Log login failures with the username, NAS address and NAS tty -
	  requested by Andi Bauer
	- ACLs were not applied through the default authentication
	  (ie: user=DEFAULT) path - reported by Robert Lister

F4.0.4.15
	- Check data lengths in debugging functions - reported by Antonin
	  Vitecek
	- Fix syslog facility selection - from Timo Vanoni & Josef Voggesser
	- Add -G/foreground option
	- Deal with missing socklen_t

F4.0.4.16
	- Few innocuous changes from or inspired by FreeBSD ports
	- Deal with max-session finger format difference in a way that does not
	  require knowing which IOS is being fingered.
	- The header encryption field is really a flags field which includes
	  a single-session option (which we'd like to support)
	- Check return of write() for interrupts when writing arguments to
	  external scripts.
	- -G was not remaining in foreground - From Nathan Schrenk
	- Do not attempt to remove the pidfile if the pidfilebuf was truncated
	  or we could not open the file.
	- Add 'accounting syslog;' configuration knob - mostly from Mark Ellzey
	  Thomas
	- Notes about PAM - from Aaron Scarisbrick
	- Allow PAM debug message with tac_plus password debugging option - from
	  Aaron Scarisbrick
	- Allow \'s within quoted words in tac_plus.conf - from Jesse Zbikowski
	- Allow 'file' <password_spec> for host and user enable - part from
	  Jeff Gehlbach via Daniel Schmidt
	- Fix possible buffer overflow for arap - noted by Oren Nechushtan

F4.0.4.17
	- Move REARMSIGNAL definition to autoconf
	- Move REAPCHILD definition to autoconf and check if SIG_IGN works
	- Move SIGCHLD handling to apply to all daemon personalities - partly
	  from John Payne

F4.0.4.18
	- Fix missing printf argument in debug output
	- Add "enable = nopassword" to users, groups and hosts.

F4.0.4.19
	- offer $ip to before/after authorization scripts
	- wtmp and accounting files do not need to be mutually exclusive
	- add authorization script example - from Daniel Schmidt
	- add partial support for single-connection mode
	- convert select()s to poll()s

F4.0.4.20
	- remove stupid error message about running as root
	- Drop the private regex library in favor of libc's.  A system w/o a
	  regex is one I dont care about.
	- finally remove config parsing for 'default authorization = permit'
	- apply ACLs to pap, chap, arap and ms-chap authentication too
	- change accounting log time format to match syslog
	- do_auth.py fix from Daniel Schmidt
	- import fdes from David G. Koontz (1991) for ARAP/MSCHAP_DES
	- move MSCHAP define to autoconf; --enable-mschap
	- use the fdes code for ARAP_DES and MSCHAP_DES.  NOTE: I have no way to
	  test this.  lmk if it does not work.
	- increase NAC address array size.  affects the format of the tacacs
	  wholog file (TACPLUS_WHOLOGFILE); existing file should be removed.
	- add comments to tac_plus.conf.5 about cipher algorithms in
	  password_spec
	- do_auth.py - Fixed reression, Support for replacing av pairs - from
	  Daniel Schmidt

F4.0.4.21
	- do_auth.py - better Nexus support, better AV replacement, and only
	  send roles to Nexus - from Daniel Schmidt
	- fix bug in checking the return value of regexec() for login and enable
	  ACLs.
	- do_auth.py - better Nexus support, better AV replacement, and only

F4.0.4.22
	- check of regexec() return value inverted - from Ignas Kazlauskas

F4.0.4.23
	- fix build on netbsd
	- update PAM includes for OSX - YiJia Zhang

F4.0.4.24
	- allow PAM for pap authentication - Jeroen Nijhof
	- replace home-grown vprintf in report() with vsnprintf - Robert Swiecki
	- dont use report in signal handler, since report uses syslog which uses
	  malloc - Robert Swiecki
	- use volatile sig_atomic_t 'reinitialize' variable - Robert Swiecki
	- use snprintf in get_authen_continue() and send_authen_error() and
	  check return - Robert Swiecki
	- make snprintf buffers of get_authen_continue() and send_authen_error()
	  at least NI_MAXHOST bytes - Robert Swiecki

F4.0.4.25
	- add -m (md5) option to tac_pwd.  XXX could use better salt generation
	- use random() in tac_pwd if available and generate 4 bytes of salt for
	  md5.
	- sprintf -> snprintf - Robert Swiecki
	- more pkt size checking in acct.c, authen.c, author.c - Robert Swiecki
	- free(pak) in start_session() not in account(), for consistency

F4.0.4.26
	- add optional securid support via aceclient library - Matt Addison
	- use localtime instead of gmtime for log messages so that the timezone
	  is inheritted.
	- allow file authentication for PAP authorization

F4.0.4.27a
	- add "port" to clarify log messages of default_fn.c
	- use program name (filename) instead of hard-coded "tac_plus" for
	  name given to PAM
	- change socket binding to allow an IPv6 address with the -B argument
	- bind v4 and v6 sockets if system claims its has addresses for the AFs