What's new in Sudo 1.7.10p7?
* A time stamp file with the date set to the epoch by "sudo -k"
is now completely ignored regardless of what the local clock is
set to. Previously, if the local clock was set to a value between
the epoch and the time stamp timeout value, a time stamp reset
by "sudo -k" would be considered current.
* Fixed the sudo exit status when "sudo -l command" is run.
This is a regression introduced in version 1.7.10.
What's new in Sudo 1.7.10p6?
* Fixed the restoration of SIGINT, SIGQUIT and SIGTSTP. This
is a regression introduced in version 1.7.10p4.
* The tty-specific time stamp file now includes the session ID
of the sudo process that created it. If a process with the same
tty but a different session ID runs sudo, the user will now be
prompted for a password (assuming authentication is required for
the command).
What's new in Sudo 1.7.10p5?
* On systems where the controlling tty can be determined via /proc
or sysctl(), sudo will no longer fall back to using ttyname()
if the process has no controlling tty. This prevents sudo from
using a non-controlling tty for logging and time stamp purposes.
* Fixed a potential crash in visudo's alias cycle detection.
What's new in Sudo 1.7.10p4?
* Avoid building PIE binaries on FreeBSD/ia64 as they don't run
properly.
* Fixed a crash in visudo strict mode when an unknown Defaults
setting is encountered.
* Do not inform the user that the command was not permitted by the
policy if they do not successfully authenticate. This is a
regression introduced in sudo 1.7.10.
* Fix running commands that need the terminal in the background
when I/O logging is enabled. E.g. "sudo vi &". When the command
is foregrounded, it will now resume properly.
What's new in Sudo 1.7.10p3?
* Fixed post-processing of the man pages on systems with legacy
versions of sed.
* Fixed "sudoreplay -l" on Linux systems with file systems that
set DT_UNKNOWN in the d_type field of struct dirent.
What's new in Sudo 1.7.10p2?
* Fixed suspending a command after it has already been resumed
once when I/O logging (or use_pty) is not enabled.
This was a regression introduced in version 1.7.10.
What's new in Sudo 1.7.10p1?
* Fixed the setting of LOGNAME, USER and USERNAME variables in the
command's environment when env_reset is enabled (the default).
This was a regression introduced in version 1.7.10.
* Sudo now honors SUCCESS=return in /etc/nsswitch.conf.
What's new in Sudo 1.7.10?
* Sudo is now built with the -fstack-protector flag if the the
compiler supports it. Also, the -zrelro linker flag is used if
supported. The --disable-hardening configure option can be used
to build sudo without stack smashing protection.
* Sudo is now built as a Position Independent Executable (PIE)
if supported by the compiler and linker.
* If the user is a member of the "exempt" group in sudoers, they
will no longer be prompted for a password even if the -k flag
is specified with the command. This makes "sudo -k command"
consistent with the behavior one would get if the user ran "sudo
-k" immediately before running the command.
* The sudoers file may now be a symbolic link. Previously, sudo
would refuse to read sudoers unless it was a regular file.
* The user/group/mode checks on sudoers files have been relaxed.
As long as the file is owned by the sudoers uid, not world-writable
and not writable by a group other than the sudoers gid, the file
is considered OK. Note that visudo will still set the mode to
the value specified at configure time.
* /etc/environment is no longer read directly on Linux systems
when PAM is used. Sudo now merges the PAM environment into the
user's environment which is typically set by the pam_env module.
* The initial evironment created when env_reset is in effect now
includes the contents of /etc/environment on AIX systems and the
"setenv" and "path" entries from /etc/login.conf on BSD systems.
* On systems with an SVR4-style /proc file system, the /proc/pid/psinfo
file is now uses to determine the controlling terminal, if possible.
This allows tty-based tickets to work properly even when, e.g.
standard input, output and error are redirected to /dev/null.
* The output of "sudoreplay -l" is now sorted by file name (or
sequence number). Previously, entries were displayed in the
order in which they were found on the file system.
* The sudoreplay command can now properly replay sessions where
no tty was present.
* Sudo now behaves properly when I/O logging is enabled and the
controlling terminal is revoked (e.g. the running sshd is killed).
Previously, sudo may have exited without calling the I/O plugin's
close function which can lead to an incomplete I/O log.
* Sudo can now detect when a user has logged out and back in again
on Solaris 11, just like it can on Solaris 10.
* The built-in zlib included with Sudo has been upgraded to version
1.2.6.
* Setting the SSL parameter to start_tls in ldap.conf now works
properly when using Mozilla-based SDKs that support the
ldap_start_tls_s() function.
* The TLS_CHECKPEER parameter in ldap.conf now works when the
Mozilla NSS crypto backend is used with OpenLDAP.
* Improved support for the Tivoli Directory Server LDAP client
libraries. This includes support for using LDAP over SSL (ldaps)
as well as support for the BIND_TIMELIMIT, TLS_KEY and TLS_CIPHERS
ldap.conf options. A new ldap.conf option, TLS_KEYPW can be
used to specify a password to decrypt the key database.
* Fixed a crash introduced in version 1.7.7 when "sudo -s" is
specified with a command.
* If a user fails to authenticate and the command would be rejected
by sudoers, it is now logged with "command not allowed" instead
of "N incorrect password attempts". Likewise, the "mail_no_perms"
sudoers option now takes precedence over "mail_badpass".
* The sudo manuals are now formatted using the mdoc macros. Versions
using the legacy man macros are provided for systems that lack mdoc.
* Fixed a problem with the reboot and shutdown commands on some
systems (such as HP-UX and BSD). On these systems, reboot sends
all processes (except itself) SIGTERM. When sudo received
SIGTERM, it would relay it to the reboot process, thus killing
reboot before it had a chance to actually reboot the system.
* Visudo will now warn about unknown Defaults entries that are
per-host, per-user, per-runas or per-command.
* When constructing a time filter for use with LDAP sudoNotBefore
and sudoNotAfter attributes, the current time now includes tenths
of a second. This fixes a problem with timed entries on Active
Directory.
* Fixed a race condition that could cause sudo to receive SIGTTOU
(and stop) when resuming a shell that was run via sudo when I/O
logging (and use_pty) is not enabled.
* Sending SIGTSTP directly to the sudo process will now suspend the
running command when I/O logging (and use_pty) is not enabled.
What's new in Sudo 1.7.9p1?
* Fixed a bug when matching against an IP address with an associated
netmask in the sudoers file. In certain circumstances, this
could allow users to run commands on hosts they are not authorized
for.
What's new in Sudo 1.7.9?
* Fixed a false positive in visudo strict mode when aliases are
in use.
* The line on which a syntax error is reported in the sudoers file
is now more accurate. Previously it was often off by a line.
* The #include and #includedir directives in sudoers now support
relative paths. If the path is not fully qualified it is expected
to be located in the same directory of the sudoers file that is
including it.
* visudo will now fix the mode on the sudoers file even if no changes
are made unless the -f option is specified.
* The "use_loginclass" sudoers option works properly again.
* For LDAP-based sudoers, values in the search expression are now
escaped as per RFC 4515.
* Fixed a race condition when I/O logging is not enabled that could
result in tty-generated signals (e.g. control-C) being received
by the command twice.
* If none of the standard input, output or error are connected to
a tty device, sudo will now check its parent's standard input,
output or error for the tty name on systems with /proc and BSD
systems that support the KERN_PROC_PID sysctl. This allows
tty-based tickets to work properly even when, e.g. standard
input, output and error are redirected to /dev/null.
* Fixed a bug where a pattern like "/usr/*" included /usr/bin/ in
the results, which would be incorrectly be interpreted as if the
sudoers file had specified a directory.
* "visudo -c" will now list any include files that were checked
in addition to the main sudoers file when everything parses OK.
* Users that only have read-only access to the sudoers file may
now run "visudo -c". Previously, write permissions were required
even though no writing is down in check-only mode.
What's new in Sudo 1.7.8p2?
* Fixed a crash in the monitor process on Solaris when NOPASSWD
was specified or when authentication was disabled.
What's new in Sudo 1.7.8p1?
* Fixed matching of a Runas_Alias in the group section of a
Runas_Spec.
What's new in Sudo 1.7.8?
* Sudo will now use PAM by default on AIX 6 and higher.
* Added --enable-werror configure option for gcc's -Werror flag.
* Visudo no longer assumes all editors support the +linenumber
command line argument. It now uses a whitelist of editors known
to support the option.
* Fixed matching of network addresses when a netmask is specified
but the address is not the first one in the CIDR block.
* The configure script now check whether or not errno.h declares
the errno variable. Previously, sudo would always declare errno
itself for older systems that don't declare it in errno.h.
* The NOPASSWD tag is now honored for denied commands too, which
matches historic sudo behavior (prior to sudo 1.7.0).
* Sudo now honors the "DEREF" setting in ldap.conf which controls
how alias dereferencing is done during an LDAP search.
* Using the -n option may in conjunction with the -v or -l option
no longer results in a usage error.
* The LOGNAME, USER and USERNAME environment variables are preserved
correctly again in sudoedit mode.
What's new in Sudo 1.7.7
* I/O logging is now supported for commands run in background mode
(using sudo's -b flag).
* Group ownership of the sudoers file is now only enforced when
the file mode on sudoers allows group readability or writability.
* Visudo now checks the contents of an alias and warns about cycles
when the alias is expanded.
* If the user specifes a group via sudo's -g option that matches
the target user's group in the password database, it is now
allowed even if no groups are present in the Runas_Spec.
* "sudo -i command" now works correctly with the bash version
2.0 and higher. Previously, the .bash_profile would not be
sourced prior to running the command unless bash was built with
NON_INTERACTIVE_LOGIN_SHELLS defined.
* Multi-factor authentication is now supported on AIX.
* Added support for non-RFC 4517 compliant LDAP servers that require
that seconds be present in a timestamp, such as Tivoli Directory Server.
* If the group vector is to be preserved, the PATH search for the
command is now done with the user's original group vector.
* For LDAP-based sudoers, the "runas_default" sudoOption now works
properly in a sudoRole that contains a sudoCommand.
* Spaces in command line arguments for "sudo -s" and "sudo -i" are
now escaped with a backslash when checking the sudoers file.
What's new in Sudo 1.7.6p2
* Two-character CIDR-style IPv4 netmasks are now matched correctly
in the sudoers file.
* A build error with MIT Kerberos V has been resolved.
What's new in Sudo 1.7.6p1
* A non-existent includedir is now treated the same as an empty
directory and not reported as an error.
* Removed extraneous parens in LDAP filter when sudoers_search_filter
is enabled that can cause an LDAP search error.
What's new in Sudo 1.7.6?
* A new LDAP setting, sudoers_search_filter, has been added to
ldap.conf. This setting can be used to restrict the set of
records returned by the LDAP query. Based on changes from Matthew
Thomas.
* White space is now permitted within a User_List when used in
conjunction with a per-user Defaults definition.
* A group ID (%#gid) may now be specified in a User_List or Runas_List.
Likewise, for non-Unix groups the syntax is %:#gid.
* Support for double-quoted words in the sudoers file has been fixed.
The change in 1.7.5 for escaping the double quote character
caused the double quoting to only be available at the beginning
of an entry.
* The fix for resuming a suspended shell in 1.7.5 caused problems
with resuming non-shells on Linux. Sudo will now save the process
group ID of the program it is running on suspend and restore it
when resuming, which fixes both problems.
* A bug that could result in corrupted output in "sudo -l" has been
fixed.
What's new in Sudo 1.7.5?
* When using visudo in check mode, a file named "-" may be used to
check sudoers data on the standard input.
* Sudo now only fetches shadow password entries when using the
password database directly for authentication.
* Password and group entries are now cached using the same key
that was used to look them up. This fixes a problem when looking
up entries by name if the name in the retrieved entry does not
match the name used to look it up. This may happen on some systems
that do case insensitive lookups or that truncate long names.
* GCC will no longer display warnings on glibc systems that use
the warn_unused_result attribute for write(2) and other system calls.
* If a PAM account management module denies access, sudo now prints
a more useful error message and stops trying to validate the user.
* Fixed a potential hang on idle systems when the sudo-run process
exits immediately.
* Sudo now includes a copy of zlib that will be used on systems
that do not have zlib installed.
* The --with-umask-override configure flag has been added to enable
the "umask_override" sudoers Defaults option at build time.
* Sudo now unblocks all signals on startup to avoid problems caused
by the parent process changing the default signal mask.
* LDAP Sudoers entries may now specify a time period for which
the entry is valid. This requires an updated sudoers schema
that includes the sudoNotBefore and sudoNotAfter attributes.
Support for timed entries must be explicitly enabled in the
ldap.conf file. Based on changes from Andreas Mueller.
* LDAP Sudoers entries may now specify a sudoOrder attribute that
determines the order in which matching entries are applied. The
last matching entry is used, just like file-based sudoers. This
requires an updated sudoers schema that includes the sudoOrder
attribute. Based on changes from Andreas Mueller.
* When run as sudoedit, or when given the -e flag, sudo now treats
command line arguments as pathnames. This means that slashes
in the sudoers file entry must explicitly match slashes in
the command line arguments. As a result, and entry such as:
user ALL = sudoedit /etc/*
will allow editing of /etc/motd but not /etc/security/default.
* NETWORK_TIMEOUT is now an alias for BIND_TIMELIMIT in ldap.conf for
compatibility with OpenLDAP configuration files.
* The LDAP API TIMEOUT parameter is now honored in ldap.conf.
* The I/O log directory may now be specified in the sudoers file.
* Sudo will no longer refuse to run if the sudoers file is writable
by root.
* Sudo now performs command line escaping for "sudo -s" and "sudo -i"
after validating the command so the sudoers entries do not need
to include the backslashes.
* Logging and email sending are now done in the locale specified
by the "sudoers_locale" setting ("C" by default). Email send by
sudo now includes MIME headers when "sudoers_locale" is not "C".
* The configure script has a new option, --disable-env-reset, to
allow one to change the default for the sudoers Default setting
"env_reset" at compile time.
* When logging "sudo -l command", sudo will now prepend "list "
to the command in the log line to distinguish between an
actual command invocation in the logs.
* Double-quoted group and user names may now include escaped double
quotes as part of the name. Previously this was a parse error.
* Sudo once again restores the state of the signal handlers it
modifies before executing the command. This allows sudo to be
used with the nohup command.
* Resuming a suspended shell now works properly when I/O logging
is not enabled (the I/O logging case was already correct).
What's new in Sudo 1.7.4p6?
* A bug has been fixed in the I/O logging support that could cause
visual artifacts in full-screen programs such as text editors.
What's new in Sudo 1.7.4p5?
* A bug has been fixed that would allow a command to be run without the
user entering a password when sudo's -g flag is used without the -u flag.
* If user has no supplementary groups, sudo will now fall back on checking
the group file explicitly, which restores historic sudo behavior.
* A crash has been fixed when sudo's -g flag is used without the -u flag
and the sudoers file contains an entry with no runas user or group listed.
* A crash has been fixed when the Solaris project support is enabled
and sudo's -g flag is used without the -u flag.
* Sudo no longer exits with an error when support for auditing is
compiled in but auditing is not enabled.
* Fixed a bug introduced in sudo 1.7.3 where the ticket file was not
being honored when the "targetpw" sudoers Defaults option was enabled.
* The LOG_INPUT and LOG_OUTPUT tags in sudoers are now parsed correctly.
* A crash has been fixed in "sudo -l" when sudo is built with auditing
support and the user is not allowed to run any commands on the host.
What's new in Sudo 1.7.4p4?
* A potential security issue has been fixed with respect to the handling
of sudo's -g command line option when -u is also specified. The flaw
may allow an attacker to run commands as a user that is not authorized
by the sudoers file.
* A bug has been fixed where "sudo -l" output was incomplete if multiple
sudoers sources were defined in nsswitch.conf and there was an error
querying one of the sources.
* The log_input, log_output, and use_pty sudoers options now work correctly
on AIX. Previously, sudo would hang if they were enabled.
* The "make install" target now works correctly when sudo is built in a
directory other than the source directory.
* The "runas_default" sudoers setting now works properly in a per-command
Defaults line.
* Suspending and resuming the bash shell when PAM is in use now works
correctly. The SIGCONT signal was not propagated to the child process.
What's new in Sudo 1.7.4p3?
* A bug has been fixed where duplicate HOME environment variables could be
present when the env_reset setting was disabled and the always_set_home
setting was enabled in sudoers.
* The value of sysconfdir is now substituted into the path to the sudoers.d
directory in the installed sudoers file.
* Compilation problems on IRIX and other platforms have been fixed.
* If multiple PAM "auth" actions are specified and the user enters ^C at
the password prompt, sudo will no longer prompt for a password for any
subsequent "auth" actions. Previously it was necessary to enter ^C for
each "auth" action.
What's new in Sudo 1.7.4p2?
* A bug where sudo could spin in a busy loop waiting for the child process
has been fixed.
What's new in Sudo 1.7.4p1?
* A bug introduced in sudo 1.7.3 that prevented the -k and -K options from
functioning when the tty_tickets sudoers option is enabled has been fixed.
* Sudo no longer prints a warning when the -k or -K options are specified
and the ticket file does not exist.
* It is now easier to cross-compile sudo.
What's new in Sudo 1.7.4?
* Sudoedit will now preserve the file extension in the name of the
temporary file being edited. The extension is used by some
editors (such as emacs) to choose the editing mode.
* Time stamp files have moved from /var/run/sudo to either /var/db/sudo,
/var/lib/sudo or /var/adm/sudo. The directories are checked for
existence in that order. This prevents users from receiving the
sudo lecture every time the system reboots. Time stamp files older
than the boot time are ignored on systems where it is possible to
determine this.
* The tty_tickets sudoers option is now enabled by default.
* Ancillary documentation (README files, LICENSE, etc) is now installed
in a sudo documentation directory.
* Sudo now recognizes "tls_cacert" as an alias for "tls_cacertfile"
in ldap.conf.
* Defaults settings that are tied to a user, host or command may
now include the negation operator. For example:
Defaults:!millert lecture
will match any user but millert.
* The default PATH environment variable, used when no PATH variable
exists, now includes /usr/sbin and /sbin.
* Sudo now uses polypkg (http://rc.quest.com/topics/polypkg/)
for cross-platform packing.
* On Linux, sudo will now restore the nproc resource limit before
executing a command, unless the limit appears to have been modified
by pam_limits. This avoids a problem with bash scripts that open
more than 32 descriptors on SuSE Linux, where sysconf(_SC_CHILD_MAX)
will return -1 when RLIMIT_NPROC is set to RLIMIT_UNLIMITED (-1).
* The HOME and MAIL environment variables are now reset based on the
target user's password database entry when the env_reset sudoers option
is enabled (which is the case in the default configuration). Users
wishing to preserve the original values should use a sudoers entry like:
Defaults env_keep += HOME
to preserve the old value of HOME and
Defaults env_keep += MAIL
to preserve the old value of MAIL.
* Fixed a problem in the restoration of the AIX authdb registry setting.
* Sudo will now fork(2) and wait until the command has completed before
calling pam_close_session().
* The default syslog facility is now "authpriv" if the operating system
supports it, else "auth".
What's new in Sudo 1.7.3?
* Support for logging I/O for the command being run.
For more information, see the documentation for the "log_input"
and "log_output" Defaults options in the sudoers manual. Also
see the sudoreplay manual for how to replay I/O log sessions.
* The use_pty sudoers option can be used to force a command to be
run in a pseudo-pty, even when I/O logging is not enabled.
* On some systems, sudo can now detect when a user has logged out
and back in again when tty-based time stamps are in use. Supported
systems include Solaris systems with the devices file system,
Mac OS X, and Linux systems with the devpts filesystem (pseudo-ttys
only).
* On AIX systems, the registry setting in /etc/security/user is
now taken into account when looking up users and groups. Sudo
now applies the correct the user and group ids when running a
command as a user whose account details come from a different
source (e.g. LDAP or DCE vs. local files).
* Support for multiple 'sudoers_base' and 'uri' entries in ldap.conf.
When multiple entries are listed, sudo will try each one in the
order in which they are specified.
* Sudo's SELinux support should now function correctly when running
commands as a non-root user and when one of stdin, stdout or stderr
is not a terminal.
* Sudo will now use the Linux audit system with configure with
the --with-linux-audit flag.
* Sudo now uses mbr_check_membership() on systems that support it
to determine group membership. Currently, only Darwin (Mac OS X)
supports this.
* When the tty_tickets sudoers option is enabled but there is no
terminal device, sudo will no longer use or create a tty-based
ticket file. Previously, sudo would use a tty name of "unknown".
As a consequence, if a user has no terminal device, sudo will
now always prompt for a password.
* The passwd_timeout and timestamp_timeout options may now be
specified as floating point numbers for more granular timeout
values.
* Negating the fqdn option in sudoers now works correctly when sudo
is configured with the --with-fqdn option. In previous versions
of sudo the fqdn was set before sudoers was parsed.
What's new in Sudo 1.7.2?
* A new #includedir directive is available in sudoers. This can be
used to implement an /etc/sudo.d directory. Files in an includedir
are not edited by visudo unless they contain a syntax error.
* The -g option did not work properly when only setting the group
(and not the user). Also, in -l mode the wrong user was displayed
for sudoers entries where only the group was allowed to be set.
* Fixed a problem with the alias checking in visudo which
could prevent visudo from exiting.
* Sudo will now correctly parse the shell-style /etc/environment
file format used by pam_env on Linux.
* When doing password and group database lookups, sudo will only
cache an entry by name or by id, depending on how the entry was
looked up. Previously, sudo would cache by both name and id
from a single lookup, but this breaks sites that have multiple
password or group database names that map to the same uid or
gid.
* User and group names in sudoers may now be enclosed in double
quotes to avoid having to escape special characters.
* BSM audit fixes when changing to a non-root uid.
* Experimental non-Unix group support. Currently only works with
Quest Authorization Services and allows Active Directory groups
fixes for Minix-3.
* For Netscape/Mozilla-derived LDAP SDKs the certificate and key
paths may be specified as a directory or a file. However, version
5.0 of the SDK only appears to support using a directory (despite
documentation to the contrary). If SSL client initialization
fails and the certificate or key paths look like they could be
default file name, strip off the last path element and try again.
* A setenv() compatibility fix for Linux systems, where a NULL
value is treated the same as an empty string and the variable
name is checked against the NULL pointer.
What's new in Sudo 1.7.1?
* A new Defaults option "pwfeedback" will cause sudo to provide visual
feedback when the user is entering a password.
* A new Defaults option "fast_glob" will cause sudo to use the fnmatch()
function for file name globbing instead of glob(). When this option
is enabled, sudo will not check the file system when expanding wildcards.
This is faster but a side effect is that relative paths with wildcard
will no longer work.
* New BSM audit support for systems that support it such as FreeBSD
and Mac OS X.
* The file name specified with the #include directive may now include
a %h escape which is expanded to the short form of hostname.
* The -k flag may now be specified along with a command, causing the
user's timestamp file to be ignored.
* New support for Tivoli-based LDAP START_TLS, present in AIX.
* New support for /etc/netsvc.conf on AIX.
* The unused alias checks in visudo now handle the case of an alias
referring to another alias.
What's new in Sudo 1.7.0?
* Rewritten parser that converts sudoers into a set of data structures.
This eliminates a number of ordering issues and makes it possible to
apply sudoers Defaults entries before searching for the command.
It also adds support for per-command Defaults specifications.
* Sudoers now supports a #include facility to allow the inclusion of other
sudoers-format files.
* Sudo's -l (list) flag has been enhanced:
o applicable Defaults options are now listed
o a command argument can be specified for testing whether a user
may run a specific command.
o a new -U flag can be used in conjunction with "sudo -l" to allow
root (or a user with "sudo ALL") list another user's privileges.
* A new -g flag has been added to allow the user to specify a
primary group to run the command as. The sudoers syntax has been
extended to include a group section in the Runas specification.
* A uid may now be used anywhere a username is valid.
* The "secure_path" run-time Defaults option has been restored.
* Password and group data is now cached for fast lookups.
* The file descriptor at which sudo starts closing all open files is now
configurable via sudoers and, optionally, the command line.
* Visudo will now warn about aliases that are defined but not used.
* The -i and -s command line flags now take an optional command
to be run via the shell. Previously, the argument was passed
to the shell as a script to run.
* Improved LDAP support. SASL authentication may now be used in
conjunction when connecting to an LDAP server. The krb5_ccname
parameter in ldap.conf may be used to enable Kerberos.
* Support for /etc/nsswitch.conf. LDAP users may now use nsswitch.conf
to specify the sudoers order. E.g.:
sudoers: ldap files
to check LDAP, then /etc/sudoers. The default is "files", even
when LDAP support is compiled in. This differs from sudo 1.6
where LDAP was always consulted first.
* Support for /etc/environment on AIX and Linux. If sudo is run
with the -i flag, the contents of /etc/environment are used to
populate the new environment that is passed to the command being
run.
* If no terminal is available or if the new -A flag is specified,
sudo will use a helper program to read the password if one is
configured. Typically, this is a graphical password prompter
such as ssh-askpass.
* A new Defaults option, "mailfrom" that sets the value of the
"From:" field in the warning/error mail. If unspecified, the
login name of the invoking user is used.
* A new Defaults option, "env_file" that refers to a file containing
environment variables to be set in the command being run.
* A new flag, -n, may be used to indicate that sudo should not
prompt the user for a password and, instead, exit with an error
if authentication is required.
* If sudo needs to prompt for a password and it is unable to disable
echo (and no askpass program is defined), it will refuse to run
unless the "visiblepw" Defaults option has been specified.
* Prior to version 1.7.0, hitting enter/return at the Password: prompt
would exit sudo. In sudo 1.7.0 and beyond, this is treated as
an empty password. To exit sudo, the user must press ^C or ^D
at the prompt.
* visudo will now check the sudoers file owner and mode in -c (check)
mode when the -s (strict) flag is specified.
* A new Defaults option "umask_override" will cause sudo to set the
umask specified in sudoers even if it is more permissive than the
invoking user's umask.