gitolite/src/gl-auth-command

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#!/usr/bin/perl
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use strict;
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use warnings;
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# === auth-command ===
# the command that GL users actually run
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# part of the gitolite (GL) suite
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# how run: via sshd, being listed in "command=" in ssh authkeys
# when: every login by a GL user
# input: $1 is GL username, plus $SSH_ORIGINAL_COMMAND
# output:
# security:
# - currently, we just make some basic checks, copied from gitosis
# robustness:
# other notes:
# ----------------------------------------------------------------------------
# common definitions
# ----------------------------------------------------------------------------
# these are set by the "rc" file
our ($GL_LOGT, $GL_CONF_COMPILED, $REPO_BASE, $GIT_PATH, $REPO_UMASK, $GL_ADMINDIR, $RSYNC_BASE, $HTPASSWD_FILE, $GL_WILDREPOS, $GL_ADC_PATH, $SVNSERVE);
# and these are set by gitolite.pm
our ($R_COMMANDS, $W_COMMANDS, $REPONAME_PATT, $REPOPATT_PATT);
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our %repos;
our %groups;
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# the common setup module is in the same directory as this running program is
my $bindir = $0;
$bindir =~ s/\/[^\/]+$//;
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$bindir = "$ENV{PWD}/$bindir" unless $bindir =~ /^\//;
require "$bindir/gitolite.pm";
# ask where the rc file is, get it, and "do" it
&where_is_rc();
die "parse $ENV{GL_RC} failed: " . ($! or $@) unless do $ENV{GL_RC};
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# we need to pass GL_ADMINDIR and the bindir to the child hooks
$ENV{GL_ADMINDIR} = $GL_ADMINDIR;
$ENV{GL_BINDIR} = $bindir;
# add a custom path for git binaries, if specified
$ENV{PATH} .= ":$GIT_PATH" if $GIT_PATH;
# set the umask before creating any files
umask($REPO_UMASK);
my $repo_base_abs = $ENV{GL_REPO_BASE_ABS} = ( $REPO_BASE =~ m(^/) ? $REPO_BASE : "$ENV{HOME}/$REPO_BASE" );
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# ----------------------------------------------------------------------------
# start...
# ----------------------------------------------------------------------------
# no arguments given? default user is $USER (fedorahosted works like this,
# and it is harmless for others)
@ARGV = ($ENV{USER}) unless @ARGV;
# if the first argument is a "-s", this user is allowed to get a shell using
# this key
my $shell_allowed = 0;
if ($ARGV[0] eq '-s') {
$shell_allowed = 1;
shift;
}
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# first, fix the biggest gripe I have with gitosis, a 1-line change
my $user=$ENV{GL_USER}=shift; # there; now that's available everywhere!
# if there are any more arguments, they're a list of group names that the user
# is a member of
$ENV{GL_GROUP_LIST} = join(" ", @ARGV) if @ARGV;
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# ----------------------------------------------------------------------------
# logging, timestamp env vars
# ----------------------------------------------------------------------------
# timestamp
my ($s, $min, $h, $d, $m, $y) = (localtime)[0..5];
$y += 1900; $m++; # usual adjustments
for ($s, $min, $h, $d, $m) {
$_ = "0$_" if $_ < 10;
}
$ENV{GL_TS} = "$y-$m-$d.$h:$min:$s";
# substitute template parameters and set the logfile name
$GL_LOGT =~ s/%y/$y/g;
$GL_LOGT =~ s/%m/$m/g;
$GL_LOGT =~ s/%d/$d/g;
$ENV{GL_LOG} = $GL_LOGT;
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# ----------------------------------------------------------------------------
# sanity checks on SSH_ORIGINAL_COMMAND
# ----------------------------------------------------------------------------
# no SSH_ORIGINAL_COMMAND given...
unless ($ENV{SSH_ORIGINAL_COMMAND}) {
# if the user is allowed to use a shell, give him one
if ($shell_allowed) {
my $shell = $ENV{SHELL};
$shell =~ s/.*\//-/; # change "/bin/bash" to "-bash"
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&log_it("$ENV{GL_TS}\t$shell\t$user\n");
exec { $ENV{SHELL} } $shell;
}
# otherwise, pretend he typed in "info" and carry on...
$ENV{SSH_ORIGINAL_COMMAND} = 'info';
}
# ----------------------------------------------------------------------------
# admin defined commands
# ----------------------------------------------------------------------------
# please see doc/admin-defined-commands.mkd for details
if ($GL_ADC_PATH and -d $GL_ADC_PATH) {
my ($cmd, @args) = split ' ', $ENV{SSH_ORIGINAL_COMMAND};
if (-x "$GL_ADC_PATH/$cmd") {
# yes this is rather strict, sorry.
do { die "I don't like $_\n" unless $_ =~ $REPOPATT_PATT } for ($cmd, @args);
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&log_it("$ENV{GL_TS}\t$GL_ADC_PATH/$ENV{SSH_ORIGINAL_COMMAND}\t$ENV{GL_USER}\n");
exec("$GL_ADC_PATH/$cmd", @args);
}
}
# ----------------------------------------------------------------------------
# get and set perms for actual repo created by wildcard-autoviv
# ----------------------------------------------------------------------------
my $CUSTOM_COMMANDS=qr/^\s*(expand|(get|set)(perms|desc))\b/;
# note that all the subs called here chdir somewhere else and do not come
# back; they all blithely take advantage of the fact that processing custom
# commands is sort of a dead end for normal (git) processing
if ($ENV{SSH_ORIGINAL_COMMAND} =~ $CUSTOM_COMMANDS) {
die "wildrepos disabled, sorry\n" unless $GL_WILDREPOS;
my $cmd = $ENV{SSH_ORIGINAL_COMMAND};
my ($verb, $repo) = ($cmd =~ /^\s*(\S+)(?:\s+'?\/?(.*?)(?:\.git)?'?)?$/);
# deal with "no argument" cases
$verb eq 'expand' ? $repo = '^' : die "$verb needs an argument\n" unless $repo;
if ($repo =~ $REPONAME_PATT and $verb =~ /getperms|setperms/) {
# with an actual reponame, you can "getperms" or "setperms"
get_set_perms($repo_base_abs, $repo, $verb, $user);
}
elsif ($repo =~ $REPONAME_PATT and $verb =~ /(get|set)desc/) {
# with an actual reponame, you can "getdesc" or "setdesc"
get_set_desc($repo_base_abs, $repo, $verb, $user);
}
elsif ($verb eq 'expand') {
# with a wildcard, you can "expand" it to see what repos actually match
die "$repo has invalid characters" unless "x$repo" =~ $REPOPATT_PATT;
expand_wild($GL_ADMINDIR, $GL_CONF_COMPILED, $repo_base_abs, $repo, $user);
} else {
die "$cmd doesn't make sense to me\n";
}
exit 0;
}
# ----------------------------------------------------------------------------
# non-git commands
# ----------------------------------------------------------------------------
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# if the command does NOT fit the pattern of a normal git command, send it off
# somewhere else...
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# side notes on detecting a normal git command: the pattern we check allows
# old style as well as new style ("git-subcommand arg" or "git subcommand
# arg"), just like gitosis does, although I'm not sure how necessary that is.
# Currently, this is how git sends across the command (including the single
# quotes):
# git-receive-pack 'reponame.git'
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my ($verb, $repo) = ($ENV{SSH_ORIGINAL_COMMAND} =~ /^\s*(git\s+\S+|\S+)\s+'\/?(.*?)(?:\.git)?'/);
unless ( $verb and ( $verb eq 'git-init' or $verb =~ $R_COMMANDS or $verb =~ $W_COMMANDS ) and $repo and $repo =~ $REPONAME_PATT ) {
# ok, it's not a normal git command; call the special command helper
&special_cmd ($GL_ADMINDIR, $GL_CONF_COMPILED, $shell_allowed, $RSYNC_BASE, $HTPASSWD_FILE, $SVNSERVE);
exit;
}
die "$repo ends with a slash; I don't like that\n" if $repo =~ /\/$/;
die "$repo has two consecutive periods; I don't like that\n" if $repo =~ /\.\./;
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# reponame
$ENV{GL_REPO}=$repo;
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# ----------------------------------------------------------------------------
# the real git commands (git-receive-pack, etc...)
# ----------------------------------------------------------------------------
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# ----------------------------------------------------------------------------
# first level permissions check
# ----------------------------------------------------------------------------
my ($perm, $creator, $wild) = &repo_rights($repo);
if ($perm =~ /C/) {
# it was missing, and you have create perms
wrap_chdir("$repo_base_abs");
new_repo($repo, "$GL_ADMINDIR/hooks/common", $user);
wrap_chdir($ENV{HOME});
}
# we know the user and repo; we just need to know what perm he's trying
# aa == attempted access
my $aa = ($verb =~ $R_COMMANDS ? 'R' : 'W');
die "$aa access for $repo DENIED to $user\n" unless $perm =~ /$aa/;
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# ----------------------------------------------------------------------------
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# over to git now
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# ----------------------------------------------------------------------------
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&log_it("$ENV{GL_TS}\t$ENV{SSH_ORIGINAL_COMMAND}\t$ENV{GL_USER}\n");
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$repo = "'$REPO_BASE/$repo.git'";
exec("git", "shell", "-c", "$verb $repo") unless $verb eq 'git-init';