diff options
Diffstat (limited to 'third_party/git/contrib/hooks/update-paranoid')
| -rwxr-xr-x | third_party/git/contrib/hooks/update-paranoid | 421 |
1 files changed, 0 insertions, 421 deletions
diff --git a/third_party/git/contrib/hooks/update-paranoid b/third_party/git/contrib/hooks/update-paranoid deleted file mode 100755 index d18b317b2f..0000000000 --- a/third_party/git/contrib/hooks/update-paranoid +++ /dev/null @@ -1,421 +0,0 @@ -#!/usr/bin/perl - -use strict; -use File::Spec; - -$ENV{PATH} = '/opt/git/bin'; -my $acl_git = '/vcs/acls.git'; -my $acl_branch = 'refs/heads/master'; -my $debug = 0; - -=doc -Invoked as: update refname old-sha1 new-sha1 - -This script is run by git-receive-pack once for each ref that the -client is trying to modify. If we exit with a non-zero exit value -then the update for that particular ref is denied, but updates for -other refs in the same run of receive-pack may still be allowed. - -We are run after the objects have been uploaded, but before the -ref is actually modified. We take advantage of that fact when we -look for "new" commits and tags (the new objects won't show up in -`rev-list --all`). - -This script loads and parses the content of the config file -"users/$this_user.acl" from the $acl_branch commit of $acl_git ODB. -The acl file is a git-config style file, but uses a slightly more -restricted syntax as the Perl parser contained within this script -is not nearly as permissive as git-config. - -Example: - - [user] - committer = John Doe <john.doe@example.com> - committer = John R. Doe <john.doe@example.com> - - [repository "acls"] - allow = heads/master - allow = CDUR for heads/jd/ - allow = C for ^tags/v\\d+$ - -For all new commit or tag objects the committer (or tagger) line -within the object must exactly match one of the user.committer -values listed in the acl file ("HEAD:users/$this_user.acl"). - -For a branch to be modified an allow line within the matching -repository section must be matched for both the refname and the -opcode. - -Repository sections are matched on the basename of the repository -(after removing the .git suffix). - -The opcode abbrevations are: - - C: create new ref - D: delete existing ref - U: fast-forward existing ref (no commit loss) - R: rewind/rebase existing ref (commit loss) - -if no opcodes are listed before the "for" keyword then "U" (for -fast-forward update only) is assumed as this is the most common -usage. - -Refnames are matched by always assuming a prefix of "refs/". -This hook forbids pushing or deleting anything not under "refs/". - -Refnames that start with ^ are Perl regular expressions, and the ^ -is kept as part of the regexp. \\ is needed to get just one \, so -\\d expands to \d in Perl. The 3rd allow line above is an example. - -Refnames that don't start with ^ but that end with / are prefix -matches (2nd allow line above); all other refnames are strict -equality matches (1st allow line). - -Anything pushed to "heads/" (ok, really "refs/heads/") must be -a commit. Tags are not permitted here. - -Anything pushed to "tags/" (err, really "refs/tags/") must be an -annotated tag. Commits, blobs, trees, etc. are not permitted here. -Annotated tag signatures aren't checked, nor are they required. - -The special subrepository of 'info/new-commit-check' can -be created and used to allow users to push new commits and -tags from another local repository to this one, even if they -aren't the committer/tagger of those objects. In a nut shell -the info/new-commit-check directory is a Git repository whose -objects/info/alternates file lists this repository and all other -possible sources, and whose refs subdirectory contains symlinks -to this repository's refs subdirectory, and to all other possible -sources refs subdirectories. Yes, this means that you cannot -use packed-refs in those repositories as they won't be resolved -correctly. - -=cut - -my $git_dir = $ENV{GIT_DIR}; -my $new_commit_check = "$git_dir/info/new-commit-check"; -my $ref = $ARGV[0]; -my $old = $ARGV[1]; -my $new = $ARGV[2]; -my $new_type; -my ($this_user) = getpwuid $<; # REAL_USER_ID -my $repository_name; -my %user_committer; -my @allow_rules; -my @path_rules; -my %diff_cache; - -sub deny ($) { - print STDERR "-Deny- $_[0]\n" if $debug; - print STDERR "\ndenied: $_[0]\n\n"; - exit 1; -} - -sub grant ($) { - print STDERR "-Grant- $_[0]\n" if $debug; - exit 0; -} - -sub info ($) { - print STDERR "-Info- $_[0]\n" if $debug; -} - -sub git_value (@) { - open(T,'-|','git',@_); local $_ = <T>; chop; close T; $_; -} - -sub match_string ($$) { - my ($acl_n, $ref) = @_; - ($acl_n eq $ref) - || ($acl_n =~ m,/$, && substr($ref,0,length $acl_n) eq $acl_n) - || ($acl_n =~ m,^\^, && $ref =~ m:$acl_n:); -} - -sub parse_config ($$$$) { - my $data = shift; - local $ENV{GIT_DIR} = shift; - my $br = shift; - my $fn = shift; - return unless git_value('rev-list','--max-count=1',$br,'--',$fn); - info "Loading $br:$fn"; - open(I,'-|','git','cat-file','blob',"$br:$fn"); - my $section = ''; - while (<I>) { - chomp; - if (/^\s*$/ || /^\s*#/) { - } elsif (/^\[([a-z]+)\]$/i) { - $section = lc $1; - } elsif (/^\[([a-z]+)\s+"(.*)"\]$/i) { - $section = join('.',lc $1,$2); - } elsif (/^\s*([a-z][a-z0-9]+)\s*=\s*(.*?)\s*$/i) { - push @{$data->{join('.',$section,lc $1)}}, $2; - } else { - deny "bad config file line $. in $br:$fn"; - } - } - close I; -} - -sub all_new_committers () { - local $ENV{GIT_DIR} = $git_dir; - $ENV{GIT_DIR} = $new_commit_check if -d $new_commit_check; - - info "Getting committers of new commits."; - my %used; - open(T,'-|','git','rev-list','--pretty=raw',$new,'--not','--all'); - while (<T>) { - next unless s/^committer //; - chop; - s/>.*$/>/; - info "Found $_." unless $used{$_}++; - } - close T; - info "No new commits." unless %used; - keys %used; -} - -sub all_new_taggers () { - my %exists; - open(T,'-|','git','for-each-ref','--format=%(objectname)','refs/tags'); - while (<T>) { - chop; - $exists{$_} = 1; - } - close T; - - info "Getting taggers of new tags."; - my %used; - my $obj = $new; - my $obj_type = $new_type; - while ($obj_type eq 'tag') { - last if $exists{$obj}; - $obj_type = ''; - open(T,'-|','git','cat-file','tag',$obj); - while (<T>) { - chop; - if (/^object ([a-z0-9]{40})$/) { - $obj = $1; - } elsif (/^type (.+)$/) { - $obj_type = $1; - } elsif (s/^tagger //) { - s/>.*$/>/; - info "Found $_." unless $used{$_}++; - last; - } - } - close T; - } - info "No new tags." unless %used; - keys %used; -} - -sub check_committers (@) { - my @bad; - foreach (@_) { push @bad, $_ unless $user_committer{$_}; } - if (@bad) { - print STDERR "\n"; - print STDERR "You are not $_.\n" foreach (sort @bad); - deny "You cannot push changes not committed by you."; - } -} - -sub load_diff ($) { - my $base = shift; - my $d = $diff_cache{$base}; - unless ($d) { - local $/ = "\0"; - my %this_diff; - if ($base =~ /^0{40}$/) { - # Don't load the diff at all; we are making the - # branch and have no base to compare to in this - # case. A file level ACL makes no sense in this - # context. Having an empty diff will allow the - # branch creation. - # - } else { - open(T,'-|','git','diff-tree', - '-r','--name-status','-z', - $base,$new) or return undef; - while (<T>) { - my $op = $_; - chop $op; - - my $path = <T>; - chop $path; - - $this_diff{$path} = $op; - } - close T or return undef; - } - $d = \%this_diff; - $diff_cache{$base} = $d; - } - return $d; -} - -deny "No GIT_DIR inherited from caller" unless $git_dir; -deny "Need a ref name" unless $ref; -deny "Refusing funny ref $ref" unless $ref =~ s,^refs/,,; -deny "Bad old value $old" unless $old =~ /^[a-z0-9]{40}$/; -deny "Bad new value $new" unless $new =~ /^[a-z0-9]{40}$/; -deny "Cannot determine who you are." unless $this_user; -grant "No change requested." if $old eq $new; - -$repository_name = File::Spec->rel2abs($git_dir); -$repository_name =~ m,/([^/]+)(?:\.git|/\.git)$,; -$repository_name = $1; -info "Updating in '$repository_name'."; - -my $op; -if ($old =~ /^0{40}$/) { $op = 'C'; } -elsif ($new =~ /^0{40}$/) { $op = 'D'; } -else { $op = 'R'; } - -# This is really an update (fast-forward) if the -# merge base of $old and $new is $old. -# -$op = 'U' if ($op eq 'R' - && $ref =~ m,^heads/, - && $old eq git_value('merge-base',$old,$new)); - -# Load the user's ACL file. Expand groups (user.memberof) one level. -{ - my %data = ('user.committer' => []); - parse_config(\%data,$acl_git,$acl_branch,"external/$repository_name.acl"); - - %data = ( - 'user.committer' => $data{'user.committer'}, - 'user.memberof' => [], - ); - parse_config(\%data,$acl_git,$acl_branch,"users/$this_user.acl"); - - %user_committer = map {$_ => $_} @{$data{'user.committer'}}; - my $rule_key = "repository.$repository_name.allow"; - my $rules = $data{$rule_key} || []; - - foreach my $group (@{$data{'user.memberof'}}) { - my %g; - parse_config(\%g,$acl_git,$acl_branch,"groups/$group.acl"); - my $group_rules = $g{$rule_key}; - push @$rules, @$group_rules if $group_rules; - } - -RULE: - foreach (@$rules) { - while (/\${user\.([a-z][a-zA-Z0-9]+)}/) { - my $k = lc $1; - my $v = $data{"user.$k"}; - next RULE unless defined $v; - next RULE if @$v != 1; - next RULE unless defined $v->[0]; - s/\${user\.$k}/$v->[0]/g; - } - - if (/^([AMD ]+)\s+of\s+([^\s]+)\s+for\s+([^\s]+)\s+diff\s+([^\s]+)$/) { - my ($ops, $pth, $ref, $bst) = ($1, $2, $3, $4); - $ops =~ s/ //g; - $pth =~ s/\\\\/\\/g; - $ref =~ s/\\\\/\\/g; - push @path_rules, [$ops, $pth, $ref, $bst]; - } elsif (/^([AMD ]+)\s+of\s+([^\s]+)\s+for\s+([^\s]+)$/) { - my ($ops, $pth, $ref) = ($1, $2, $3); - $ops =~ s/ //g; - $pth =~ s/\\\\/\\/g; - $ref =~ s/\\\\/\\/g; - push @path_rules, [$ops, $pth, $ref, $old]; - } elsif (/^([CDRU ]+)\s+for\s+([^\s]+)$/) { - my $ops = $1; - my $ref = $2; - $ops =~ s/ //g; - $ref =~ s/\\\\/\\/g; - push @allow_rules, [$ops, $ref]; - } elsif (/^for\s+([^\s]+)$/) { - # Mentioned, but nothing granted? - } elsif (/^[^\s]+$/) { - s/\\\\/\\/g; - push @allow_rules, ['U', $_]; - } - } -} - -if ($op ne 'D') { - $new_type = git_value('cat-file','-t',$new); - - if ($ref =~ m,^heads/,) { - deny "$ref must be a commit." unless $new_type eq 'commit'; - } elsif ($ref =~ m,^tags/,) { - deny "$ref must be an annotated tag." unless $new_type eq 'tag'; - } - - check_committers (all_new_committers); - check_committers (all_new_taggers) if $new_type eq 'tag'; -} - -info "$this_user wants $op for $ref"; -foreach my $acl_entry (@allow_rules) { - my ($acl_ops, $acl_n) = @$acl_entry; - next unless $acl_ops =~ /^[CDRU]+$/; # Uhh.... shouldn't happen. - next unless $acl_n; - next unless $op =~ /^[$acl_ops]$/; - next unless match_string $acl_n, $ref; - - # Don't test path rules on branch deletes. - # - grant "Allowed by: $acl_ops for $acl_n" if $op eq 'D'; - - # Aggregate matching path rules; allow if there aren't - # any matching this ref. - # - my %pr; - foreach my $p_entry (@path_rules) { - my ($p_ops, $p_n, $p_ref, $p_bst) = @$p_entry; - next unless $p_ref; - push @{$pr{$p_bst}}, $p_entry if match_string $p_ref, $ref; - } - grant "Allowed by: $acl_ops for $acl_n" unless %pr; - - # Allow only if all changes against a single base are - # allowed by file path rules. - # - my @bad; - foreach my $p_bst (keys %pr) { - my $diff_ref = load_diff $p_bst; - deny "Cannot difference trees." unless ref $diff_ref; - - my %fd = %$diff_ref; - foreach my $p_entry (@{$pr{$p_bst}}) { - my ($p_ops, $p_n, $p_ref, $p_bst) = @$p_entry; - next unless $p_ops =~ /^[AMD]+$/; - next unless $p_n; - - foreach my $f_n (keys %fd) { - my $f_op = $fd{$f_n}; - next unless $f_op; - next unless $f_op =~ /^[$p_ops]$/; - delete $fd{$f_n} if match_string $p_n, $f_n; - } - last unless %fd; - } - - if (%fd) { - push @bad, [$p_bst, \%fd]; - } else { - # All changes relative to $p_bst were allowed. - # - grant "Allowed by: $acl_ops for $acl_n diff $p_bst"; - } - } - - foreach my $bad_ref (@bad) { - my ($p_bst, $fd) = @$bad_ref; - print STDERR "\n"; - print STDERR "Not allowed to make the following changes:\n"; - print STDERR "(base: $p_bst)\n"; - foreach my $f_n (sort keys %$fd) { - print STDERR " $fd->{$f_n} $f_n\n"; - } - } - deny "You are not permitted to $op $ref"; -} -close A; -deny "You are not permitted to $op $ref"; |