aboutsummaryrefslogtreecommitdiff
blob: fc4e0f2f58705159b6fc1568f3d5f75f12ac9467 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
#!/usr/bin/perl

# gitolite shell, invoked from ~/.ssh/authorized_keys
# ----------------------------------------------------------------------

use FindBin;

BEGIN { $ENV{GL_BINDIR} = $FindBin::RealBin; }
BEGIN { $ENV{GL_LIBDIR} = "$ENV{GL_BINDIR}/lib"; }
use lib $ENV{GL_LIBDIR};

# set HOME
BEGIN { $ENV{HOME} = $ENV{GITOLITE_HTTP_HOME} if $ENV{GITOLITE_HTTP_HOME}; }

use Gitolite::Rc;
use Gitolite::Common;
use Gitolite::Conf::Load;

use strict;
use warnings;

# the main() sub expects ssh-ish things; set them up...
my $id = '';
if ( exists $ENV{G3T_USER} ) {
    $id = in_file();    # file:// masquerading as ssh:// for easy testing
} elsif ( exists $ENV{SSH_CONNECTION} ) {
    $id = in_ssh();
} elsif ( exists $ENV{REQUEST_URI} ) {
    $id = in_http();
} else {
    _die "who the *heck* are you?";
}

# sanity...
my $soc = $ENV{SSH_ORIGINAL_COMMAND};
$soc =~ s/[\n\r]+/<<newline>>/g;
_die "I don't like newlines in the command: '$soc'\n" if $ENV{SSH_ORIGINAL_COMMAND} ne $soc;

# allow gitolite-shell to be used as "$SHELL".  Experts only; no support, no docs
if (@ARGV and $ARGV[0] eq '-c') {
    shift;
    $ARGV[0] =~ s/^$0 // or _die "unknown git/gitolite command: '$ARGV[0]'";
}

# the INPUT trigger massages @ARGV and $ENV{SSH_ORIGINAL_COMMAND} as needed
trigger('INPUT');

main($id);

gl_log('END') if $$ == $ENV{GL_TID};

exit 0;

# ----------------------------------------------------------------------

sub in_file {
    gl_log( 'file', "ARGV=" . join( ",", @ARGV ), "SOC=$ENV{SSH_ORIGINAL_COMMAND}" );

    if ( $ENV{SSH_ORIGINAL_COMMAND} =~ /git-\w+-pack/ ) {
        print STDERR "TRACE: gsh(", join( ")(", @ARGV ), ")\n";
        print STDERR "TRACE: gsh(SOC=$ENV{SSH_ORIGINAL_COMMAND})\n";
    }
    return 'file';
}

sub in_http {
    http_setup_die_handler();

    _die "GITOLITE_HTTP_HOME not set" unless $ENV{GITOLITE_HTTP_HOME};

    _die "fallback to DAV not supported" if $ENV{REQUEST_METHOD} eq 'PROPFIND';

    # fake out SSH_ORIGINAL_COMMAND and SSH_CONNECTION when called via http,
    # so the rest of the code stays the same (except the exec at the end).
    http_simulate_ssh_connection();
    $ENV{SSH_ORIGINAL_COMMAND} ||= '';

    $ENV{REMOTE_USER} ||= $rc{HTTP_ANON_USER};
    @ARGV = ( $ENV{REMOTE_USER} );

    my $ip;
    ( $ip = $ENV{SSH_CONNECTION} || '(no-IP)' ) =~ s/ .*//;

    gl_log( 'http', "ARGV=" . join( ",", @ARGV ), "SOC=" . ( $ENV{SSH_ORIGINAL_COMMAND} || '' ), "FROM=$ip" );

    return 'http';
}

sub in_ssh {
    my $ip;
    ( $ip = $ENV{SSH_CONNECTION} || '(no-IP)' ) =~ s/ .*//;

    gl_log( 'ssh', "ARGV=" . join( ",", @ARGV ), "SOC=" . ( $ENV{SSH_ORIGINAL_COMMAND} || '' ), "FROM=$ip" );

    $ENV{SSH_ORIGINAL_COMMAND} ||= '';

    return $ip;
}

# ----------------------------------------------------------------------

# call this once you are sure arg-1 is the username and SSH_ORIGINAL_COMMAND
# has been setup (even if it's not actually coming via ssh).
sub main {
    my $id = shift;

    # set up the user
    my $user = $ENV{GL_USER} = shift @ARGV;

    # set up the repo and the attempted access
    my ( $verb, $repo ) = parse_soc();    # returns only for git commands
    Gitolite::Conf::Load::sanity($repo, $REPONAME_PATT);
    $ENV{GL_REPO} = $repo;
    my $aa = ( $verb =~ 'upload' ? 'R' : 'W' );

    # set up env vars from options set for this repo
    env_options($repo, $user);

    # auto-create?
    if ( repo_missing($repo) and access( $repo, $user, '^C', 'any' ) !~ /DENIED/ ) {
        require Gitolite::Conf::Store;
        Gitolite::Conf::Store->import;
        new_wild_repo( $repo, $user, $aa );
        gl_log( 'create', $repo, $user, $aa );
    }

    # a ref of 'any' signifies that this is a pre-git check, where we don't
    # yet know the ref that will be eventually pushed (and even that won't
    # apply if it's a read operation).  See the matching code in access() for
    # more information.
    unless ( $ENV{GL_BYPASS_ACCESS_CHECKS} ) {
        my $ret = access( $repo, $user, $aa, 'any' );
        trigger( 'ACCESS_1', $repo, $user, $aa, 'any', $ret );
        _die $ret . "\n(or you mis-spelled the reponame)" if $ret =~ /DENIED/;

        gl_log( "pre_git", $repo, $user, $aa, 'any', $ret );
    }

    trigger( 'PRE_GIT', $repo, $user, $aa, 'any', $verb );
    if ( $ENV{REQUEST_URI} ) {
        _system( "git", "http-backend" );
    } else {
        my $repodir = "'$rc{GL_REPO_BASE}/$repo.git'";
        _system( "git", "shell", "-c", "$verb $repodir" );
    }
    trigger( 'POST_GIT', $repo, $user, $aa, 'any', $verb );
}

# ----------------------------------------------------------------------

sub parse_soc {
    my $soc = $ENV{SSH_ORIGINAL_COMMAND};
    $soc ||= 'info';

    my $git_commands = "git-upload-pack|git-receive-pack|git-upload-archive";
    if ( $soc =~ m(^($git_commands) '?/?(.*?)(?:\.git(\d)?)?'?$) ) {
        my ( $verb, $repo, $trace_level ) = ( $1, $2, $3 );
        $ENV{D} = $trace_level if $trace_level;
        _die "invalid repo name: '$repo'" if $repo !~ $REPONAME_PATT;
        trace( 2, "git command", $soc );
        return ( $verb, $repo );
    }

    # after this we should not return; caller expects us to handle it all here
    # and exit out

    my @words = split ' ', $soc;
    if ( $rc{COMMANDS}{ $words[0] } ) {
        if ( $rc{COMMANDS}{ $words[0] } ne 'ua' ) {
            _die "suspicious characters loitering about '$soc'" if $soc !~ $REMOTE_COMMAND_PATT;
            _die "no relative paths allowed anywhere!" if $soc =~ m(\.\./);
        }
        trace( 2, "gitolite command", $soc );
        _system( "gitolite", @words );
        exit 0;
    }

    _die "unknown git/gitolite command: '$soc'";
}

# ----------------------------------------------------------------------
# helper functions for "in_http"

sub http_setup_die_handler {

    $SIG{__DIE__} = sub {
        my $service = ( $ENV{SSH_ORIGINAL_COMMAND} =~ /git-receive-pack/ ? 'git-receive-pack' : 'git-upload-pack' );
        my $message = shift; chomp($message);
        print STDERR "$message\n";

        http_print_headers($service);

        # format the service response, then the message.  With initial
        # help from Ilari and then a more detailed email from Shawn...
        $service = "# service=$service\n"; $message = "ERR $message\n";
        $service = sprintf( "%04X", length($service) + 4 ) . "$service";    # no CRLF on this one
        $message = sprintf( "%04X", length($message) + 4 ) . "$message";

        print $service;
        print "0000";                                                       # flush-pkt, apparently
        print $message;
        print STDERR $service;
        print STDERR $message;
        exit 0;                                                             # if it's ok for die_webcgi in git.git/http-backend.c, it's ok for me ;-)
      }
}

sub http_simulate_ssh_connection {
    # these patterns indicate normal git usage; see "services[]" in
    # http-backend.c for how I got that.  Also note that "info" is overloaded;
    # git uses "info/refs...", while gitolite uses "info" or "info?...".  So
    # there's a "/" after info in the list below
    if ( $ENV{PATH_INFO} =~ m(^/(.*)/(HEAD$|info/refs$|objects/|git-(?:upload|receive)-pack$)) ) {
        my $repo = $1;
        my $verb = ( $ENV{REQUEST_URI} =~ /git-receive-pack/ ) ? 'git-receive-pack' : 'git-upload-pack';
        $ENV{SSH_ORIGINAL_COMMAND} = "$verb '$repo'";
    } else {
        # this is one of our custom commands; could be anything really,
        # because of the adc feature
        my ($verb) = ( $ENV{PATH_INFO} =~ m(^/(\S+)) );
        my $args = $ENV{QUERY_STRING};
        $args =~ s/\+/ /g;
        $args =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
        $ENV{SSH_ORIGINAL_COMMAND} = $verb;
        $ENV{SSH_ORIGINAL_COMMAND} .= " $args" if $args;
        http_print_headers();    # in preparation for the eventual output!

        # we also need to pipe STDERR out via STDOUT, else the user doesn't see those messages!
        open(STDERR, ">&STDOUT") or _die "Can't dup STDOUT: $!";
    }
    $ENV{SSH_CONNECTION} = "$ENV{REMOTE_ADDR} $ENV{REMOTE_PORT} $ENV{SERVER_ADDR} $ENV{SERVER_PORT}";
}

my $http_headers_printed = 0;

sub http_print_headers {
    my ( $service, $code, $text ) = @_;

    return if $http_headers_printed++;
    $code ||= 200;
    $text ||= "OK - gitolite";

    $|++;
    print "Status: $code $text\r\n";
    print "Expires: Fri, 01 Jan 1980 00:00:00 GMT\r\n";
    print "Pragma: no-cache\r\n";
    print "Cache-Control: no-cache, max-age=0, must-revalidate\r\n";
    if ($service) {
        print "Content-Type: application/x-$service-advertisement\r\n";
    } else {
        print "Content-Type: text/plain\r\n";
    }
    print "\r\n";
}