--- /dev/null
+#!/usr/bin/perl
+# usage: sync-accounts [-n] [-C<config-file>] [<host> ...]
+# options:
+# -n do not really do anything
+# -C alternative config file (default is /etc/sync-accounts)
+# if no host(s) specified, does all
+#
+# The config file consists of directives, one per line. Leading and
+# trailing whitespace, blank lines and lines starting # are ignored.
+#
+# Some config file directives apply globally and should appear first:
+#
+# lockpasswd <suffix/filename>
+# lockgroup <suffix/filename>
+# Specifies the lockfile suffix or pathname to use when editing
+# the passwd and group files. The value is a suffix if it does
+# not start with `/'.
+#
+# logfile <filename>
+# Append log messages to <filename> instead of stdout.
+# Errors still go to stderr.
+#
+# Some config file directives set options which may be different at
+# different points in the file. The most-recently-seen value is used
+# at each point:
+#
+# uidmin <min>
+# uidmax <max>
+# homebase <pathname>
+# When an account is to be created, a uid/gid will be chosen
+# which is one higher than the highest currently in use (except
+# that ids outside the range <min>-<max> are ignored and will
+# never be used). The default home directory location is
+# <pathname>/<username>.
+#
+# sameuid
+# nosameuid
+# Specifies whether uids are supposed to match. The default is
+# nosameuid. When sameuid is on, it is an error for the uid or
+# gid of a local account not to match the corresponding remote
+# account, and new local accounts will get the remote accounts'
+# ids.
+#
+# createuser
+# createuser <commandname>
+# nocreateuser
+# Specifies whether accounts found on the remote host should be
+# created if necessary, and what command to run to do the
+# creation (eg, setup of home directory). The default is
+# nocreateuser. If createuser is specified without a commandname
+# then sync-accounts-createuser is used. The command is found on
+# the PATH if necessary. Either sameuid, or both uidmin and
+# uidmax, must be specified, if accounts are to be created.
+#
+# groups [!]<glob-pattern> ...
+# Specifies that the membership of the local groups specified
+# should be adjusted whenever account data for a particular user
+# is copied, so that the account will be a member of the affected
+# group locally iff it is a member of the same group on the
+# remote host. The specification is read from left to right,
+# until a match on a glob pattern is found. Then, the membership
+# is adjusted iff the glob pattern was not preceded by `!'.
+# THIS FEATURE IS NOT YET IMPLEMENTED.
+#
+# Some config file directives are per-host, and should appear before
+# any directives which actually modify accounts:
+#
+# host <shorthostname>
+# Starts a host's section. This resets the per-host parameters
+# to the defaults. The shorthostname need not be the host's
+# official name in any sense. If sync-accounts is invoked with
+# host names on the command line they are compared with the
+# shorthostnames.
+#
+# getpasswd <command>
+# getgroup <command>
+# Commands to run on the local host to get the passwd, shadow and
+# group data for the host in question. getpasswd must be
+# specified if user data is to be transferred; getgroup must be
+# specified if group data is to be transferred.
+#
+# getshadow <command>
+# Specifies that shadow file data is to be used (by default,
+# password information is found from the output of getpasswd).
+# The command should emit shadow data in the format specified by
+# shadow(5) on Linux. getshadow should not be specified without
+# getpasswd.
+#
+# Some configuration file directives specify that account or group
+# data is to transferred from the current host. They should appear as
+# the last thing(s) in a host section:
+#
+# user <username> [remote=<remoteusername>]
+# Specifies that account data should be copied for local user
+# <username> from the remote account <remoteusername> (assumed to
+# be the same as <username> if not specified). The account
+# password, comment field, and shell will be copied
+# unconditionally. If sameuid is specified the uid will be
+# checked.
+#
+# users <ruidmin>-<ruidmax>
+# Specifies that all remote users whose uid is in the given range
+# are to be copied to corresponding local user accounts.
+
+use POSIX;
+
+$configfile= '/etc/sync-accounts';
+$def_createuser= 'sync-accounts-createuser';
+$ch_homebase= '/home';
+
+END {
+ for $x (@unlocks) {
+ unlink $x or warn "unable to unlock by removing $x: $!\n";
+ }
+}
+
+$|=1;
+$cdays= int(time/86400);
+
+@envs_passwd= qw(USER x UID GID COMMENT HOME SHELL);
+
+while ($ARGV[0] =~ m/^-/) {
+ $_= shift @ARGV;
+ last if m/^--$/;
+ if (m/^-C/) {
+ $configfile= $';
+ } elsif (m/^-n$/) {
+ $no_act= 1;
+ } else {
+ die "unknown option $_\n";
+ }
+}
+
+open CF,"< $configfile" or die "$configfile: $!";
+
+sub fetchfile (\%$) {
+ my ($ary_ref,$get_str) = @_;
+
+ undef %$ary_ref;
+ open G,"$get_str" or die "$get_str: $!";
+ while (<G>) {
+ chomp;
+ m/^([^:]+)\:/ or die "$ch_name: $get_str:$.: $_ ?\n";
+ $ary_ref->{$1}= [ split(/\:/,$_,-1) ];
+ }
+ close G; $? and die "$ch_name: $get_str: exit code $?\n";
+}
+
+sub fetchownfile (\@$$) {
+ my ($ary_ref,$fn_str,$lock_str) = @_;
+ die "$configfile:$.: lockfile name for $fn_str not".
+ " defined (use lockpasswd/lockgroup)\n" unless length $lock_str;
+ if ($lock_str ne '/dev/null' && !$no_act) {
+ $lock_str= "$fn_str$lock_str" unless $lock_str =~ m,^/,;
+ link $fn_str,$lock_str or die "cannot lock $fn_str by creating $lock_str: $!\n";
+ push @unlocks,$lock_str;
+ }
+ open O,"$fn_str" or die "$fn_str: $!";
+ while (<O>) {
+ chomp;
+ push @$ary_ref, [ split(/\:/,$_,-1) ];
+ }
+ close O or die "$fn_str: $!";
+}
+
+sub diag ($) {
+ print "$diagstr: $_[0]\n" or die $!;
+}
+
+sub fetchown () {
+ if (!$own_fetchedpasswd) {
+ fetchownfile(@ownpasswd,'/etc/passwd',$ch_lockpasswd);
+ if (defined stat('/etc/shadow')) {
+ $own_haveshadow= 1;
+ $own_fetchedshadow= 1;
+ fetchownfile(@ownshadow,'/etc/shadow','/dev/null');
+ } elsif ($! == &ENOENT) {
+ $own_haveshadow= 0;
+ } else {
+ die "unable to check for /etc/shadow: $!\n";
+ }
+ $own_fetchedpasswd= 1;
+ }
+ if (!$own_fetchedgroup) {
+ fetchownfile(@owngroup,'/etc/group',$ch_lockgroup);
+ $own_fetchedgroup= 1;
+ }
+#print STDERR "fetchown() -> $#ownpasswd $#owngroup\n";
+}
+
+sub checkuid ($$) {
+ my ($useuid,$foruser) = @_;
+ for $e (@ownpasswd) {
+ if ($e->[0] ne $foruser && $e->[2] == $useuid) {
+ diag("uid clash with $e->[0] (uid $e->[2])");
+ return 0;
+ }
+ }
+ return 1;
+}
+
+sub copyfield ($$$$) {
+ my ($file,$entry,$field,$value) = @_;
+ eval "\$ary_ref= \\\@own$file; 1;" or die $@;
+#print STDERR "copyfield($file,$entry,$field,$value)\n";
+ for $e (@$ary_ref) {
+#print STDERR "copyfield($file,$entry,$field,$value) $e->[0] $e->[field] ".join(':',@$e)."\n";
+ next unless $e->[0] eq $entry;
+ next if $e->[$field] eq $value;
+ $e->[$field]= $value;
+ eval "\$modified$file= 1; 1;" or die $@;
+ }
+}
+
+sub fetchpasswd () {
+ return if $ch_fetchedpasswd;
+ die "$configfile:$.: getpasswd not specified for host $ch_name\n"
+ unless length $ch_getpasswd;
+ undef %remshadow;
+ fetchfile(%rempasswd,"$ch_getpasswd |");
+ if (length $ch_getshadow) {
+ fetchfile(%remshadow,"$ch_getshadow |");
+ for $k (keys %rempasswd) {
+ $rempasswd{$k}->[1]= 'xx' unless length $rempasswd{$k}->[1];
+ }
+ for $k (keys %remshadow) {
+ next unless exists $rempasswd{$k};
+ $rempasswd{$k}->[1]= $remshadow{$k}->[1];
+ }
+ }
+}
+
+sub syncuser ($$) {
+ my ($lu,$ru) = @_;
+
+ next unless $ch_doinghost;
+ $diagstr= "user $lu from $ch_name!$ru";
+
+ fetchown();
+#print STDERR "syncuser($lu,$ru)\n";
+ fetchpasswd();
+
+ if (!$rempasswd{$ru}) { diag("no remote entry"); return; }
+ if (length $ch_getshadow && exists $remshadow{$ru} && length $remshadow{$ru}->[7]) {
+ diag("remote account disabled in shadow");
+ return;
+ }
+
+ if (!grep($_->[0] eq $lu, @ownpasswd)) {
+ if (!length $opt_createuser) { diag("account creation not enabled"); return; }
+ if ($no_act) { diag("-n specified; not creating account"); return; }
+
+ if ($opt_sameuid) {
+ $useuid= $rempasswd{$ru}->[2];
+ } else {
+ length $ch_uidmin or die "no uidmin specified, cannot create users";
+ length $ch_uidmax or die "no uidmax specified, cannot create users";
+ $ch_uidmin<$ch_uidmax or die "uidmin>=uidmax specified, cannot create users";
+
+ $useuid= $ch_uidmin;
+ for $e (@ownpasswd, @owngroup) {
+ $tuid= $e->[2]; next if $tuid<$useuid || $tuid>$ch_uidmax;
+ if ($tuid==$ch_uidmax) {
+ diag("uid/gid $ch_uidmax used, cannot create users");
+ return;
+ }
+ $useuid= $tuid+1;
+ }
+ }
+
+ @newpwent= ($lu,'x',$useuid,$useuid,$rempasswd{$ru}->[4],
+ "$ch_homebase/$lu",$rempasswd{$ru}->[6]);
+
+ defined($c= open CU,"-|") or die $!;
+ if (!$c) {
+ @unlocks= ();
+ defined($c2= open STDIN,"-|") or die $!;
+ if (!$c2) {
+ print STDOUT join(':',@newpwent),"\n" or die $!;
+ exit 0;
+ }
+ for ($i=0; $i<@envs_passwd; $i++) {
+ next if $envs_passwd[$i] eq 'x';
+ $ENV{"SYNCUSER_CREATE_$envs_passwd[$i]"}= $newpwent[$i];
+ }
+ exec $opt_createuser; die "$configfile:$.: ($lu): $opt_createuser: $!\n";
+ }
+ $newpwent= <CU>;
+ close CU; $? and die "$configfile:$.: ($lu): $opt_createuser: code $?\n";
+ chomp $newpwent;
+ if (length $newpwent) {
+ if ($newpwent !~ m/\:/) { diag("creation script demurred"); return; }
+ @newpwent= split(/\:/,$newpwent,-1);
+ }
+ die "$opt_createuser: bad output: $_\n" if @newpwent!=7 or $newpwent[0] ne $lu;
+ checkuid($newpwent[2],$lu) or return;
+ if ($own_haveshadow) {
+ push(@ownshadow,[ $lu, $newpwent[1], $cdays, 0,99999,7,'','' ]);
+ $newpwent[1]= 'x';
+ $modifiedshadow= 1;
+ }
+ push @ownpasswd,[ @newpwent ];
+ $modifiedpasswd= 1;
+ }
+#print STDERR "syncuser($lu,$ru) exists $own_haveshadow\n";
+ if ($own_haveshadow && grep($_->[0] eq $lu, @ownshadow)) {
+#print STDERR "syncuser($lu,$ru) shadow $rempasswd{$ru}->[1]\n";
+ copyfield('shadow',$lu,1, $rempasswd{$ru}->[1]);
+ } else {
+#print STDERR "syncuser($lu,$ru) passwd $rempasswd{$ru}->[1]\n";
+ copyfield('passwd',$lu,1, $rempasswd{$ru}->[1]);
+ }
+ copyfield('passwd',$lu,4, $rempasswd{$ru}->[4]); # comment
+ copyfield('passwd',$lu,6, $rempasswd{$ru}->[6]); # shell
+ if ($opt_sameuid && checkuid($rempasswd{$ru}->[2],$lu)) {
+ for $e (@ownpasswd) {
+ next unless $e->[0] eq $lu;
+ $lid= $e->[2]; $rid= $rempasswd{$ru}->[2];
+ die "$diagstr: local uid $lid, remote uid $rid\n" if $lid ne $rid;
+ $lid= $e->[3]; $rid= $rempasswd{$ru}->[3];
+ die "$diagstr: local gid $lid, remote gid $rid\n" if $lid ne $rid;
+ }
+ }
+}
+
+sub banner () {
+ return if $bannerdone;
+ print "\n" or die $!; system 'date'; $? and die $?;
+ $bannerdone= 1;
+}
+
+sub finish () {
+ for $file (qw(passwd shadow group)) {
+ eval "\$modified= \$modified$file; \$data_ref= \\\@own$file;".
+ " \$fetched= \$own_fetched$file; 1;" or die $@;
+ next if !$modified;
+ die $file unless $fetched;
+ banner();
+ $newfile= $no_act ? "$file.new" : "/etc/$file.new";
+ open NF,"> $newfile";
+ for $e (@$data_ref) {
+ print NF join(':',@$e),"\n" or die $!;
+ }
+ close NF or die $!;
+ system "diff -U0 /etc/$file $newfile"; $?==256 or die $?;
+ if (!$no_act) {
+ chown 0,0, $newfile or die $!;
+ chmod 0644, $newfile or die $!;
+ rename $newfile, "/etc/$file" or die $!;
+ }
+ }
+ exit 0;
+}
+
+while (<CF>) {
+ chomp;
+ next if m/^\#/ || !m/\S/;
+ s/^\s*//; s/\s*$//;
+ finish() if m/^end$/;
+ if (m/^host\s+(\S+)$/) {
+ $ch_name= $1;
+ $ch_getpasswd= $ch_getgroup= $ch_getshadow= '';
+ $ch_fetchedpasswd= $ch_fetchedgroup;
+ $ch_doinghost= !@ARGV || grep($_ eq $ch_name, @ARGV);
+ } elsif (m/^(getpasswd|getshadow|getgroup)\s+(.*\S)$/) {
+ eval "\$ch_$1= \$2; 1;" or die $@;
+ } elsif (m/^(lockpasswd|lockgroup)\s+(\S+)$/) {
+ eval "\$ch_$1= \$2; 1;" or die $@;
+ } elsif (m,^(homebase)\s+(/\S+)$,) {
+ eval "\$ch_$1= \$2; 1;" or die $@;
+ } elsif (m/^(uidmin|uidmax)\s+(\d+)$/ && $2>0) {
+ eval "\$ch_$1= \$2; 1;" or die $@;
+ } elsif (m/^createuser$/) {
+ $opt_createuser= $def_createuser;
+ } elsif (m/^nocreateuser$/) {
+ $opt_createuser= '';
+ } elsif (m/^createuser\s+(\S+)$/) {
+ $opt_createuser= $1;
+ } elsif (m/^logfile\s+(.*\S)$/) {
+ if ($no_act) {
+ print "would log to $1\n" or die $!;
+ } else {
+ open STDOUT,">> $1" or die "$1: $!"; $|=1;
+ }
+ } elsif (m/^(no|)(sameuid)$/) {
+ eval "\$opt_$2= ".($1 eq 'no' ? 0 : 1)."; 1;" or die $@;
+ } elsif (m/^user\s+(\S+)$/) {
+ syncuser($1,$1);
+ } elsif (m/^groups\s+(.*\S)$/) {
+ } elsif (m/^user\s+(\S+)\s+remote\=(\S+)$/) {
+ syncuser($1,$2);
+ } elsif (m/^users\s+(\d+)\-(\d+)$/) {
+ $tmin= $1; $tmax= $2;
+ fetchpasswd();
+ for $k (keys %rempasswd) {
+ $tuid= $rempasswd{$k}->[2];
+ next if $tuid<$1 or $tuid>$2;
+ syncuser($k,$k);
+ }
+ } else {
+ die "$configfile:$.: unknown directive\n";
+ }
+}
+
+die "$configfile:$.: missing \`end', or read error\n";
~ian / chiark-utils.git / commitdiff