Changes since PATCHv3:
- simple tests in Makefile
- support multiple files, code refactored
- documentation and comments updated
- fix IO::File for GPG pipe
- exit peacefully in almost every situation, die on bad invocation or query
- use log_verbose() and -v for logging for the user
- use log_debug() and -d for logging for the developer
- use Net::Netrc parser and `man netrc' to improve parsing
- ignore 'default' and 'macdef' netrc entries
- require 'machine' token in netrc lines
- ignore netrc files with bad permissions or owner (from Net::Netrc)
Signed-off-by: Ted Zlatanov <t...@lifelogs.com>
---
contrib/credential/netrc/Makefile | 10 +
contrib/credential/netrc/git-credential-netrc | 423 +++++++++++++++++++++++++
2 files changed, 433 insertions(+), 0 deletions(-)
create mode 100644 contrib/credential/netrc/Makefile
create mode 100755 contrib/credential/netrc/git-credential-netrc
diff --git a/contrib/credential/netrc/Makefile
b/contrib/credential/netrc/Makefile
new file mode 100644
index 0000000..ee8c5f0
--- /dev/null
+++ b/contrib/credential/netrc/Makefile
@@ -0,0 +1,10 @@
+test_netrc:
+ @(echo "bad data" | ./git-credential-netrc -f A -d -v) || echo "Bad
invocation test, ignoring failure"
+ @echo "-> Silent invocation... nothing should show up here with a
missing file"
+ @echo "bad data" | ./git-credential-netrc -f A get
+ @echo "-> Back to noisy: -v and -d used below, missing file"
+ echo "bad data" | ./git-credential-netrc -f A -d -v get
+ @echo "-> Look for any entry in the default file set"
+ echo "" | ./git-credential-netrc -d -v get
+ @echo "-> Look for github.com in the default file set"
+ echo "host=google.com" | ./git-credential-netrc -d -v get
diff --git a/contrib/credential/netrc/git-credential-netrc
b/contrib/credential/netrc/git-credential-netrc
new file mode 100755
index 0000000..6946217
--- /dev/null
+++ b/contrib/credential/netrc/git-credential-netrc
@@ -0,0 +1,423 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Getopt::Long;
+use File::Basename;
+
+my $VERSION = "0.1";
+
+my %options = (
+ help => 0,
+ debug => 0,
+ verbose => 0,
+ file => [],
+
+ # identical token maps, e.g. host -> host, will be inserted
later
+ tmap => {
+ port => 'protocol',
+ machine => 'host',
+ path => 'path',
+ login => 'username',
+ user => 'username',
+ password => 'password',
+ }
+ );
+
+# Map each credential protocol token to itself on the netrc side.
+foreach (values %{$options{tmap}}) {
+ $options{tmap}->{$_} = $_;
+}
+
+# Now, $options{tmap} has a mapping from the netrc format to the Git credential
+# helper protocol.
+
+# Next, we build the reverse token map.
+
+# When $rmap{foo} contains 'bar', that means that what the Git credential
helper
+# protocol calls 'bar' is found as 'foo' in the netrc/authinfo file. Keys in
+# %rmap are what we expect to read from the netrc/authinfo file.
+
+my %rmap;
+foreach my $k (keys %{$options{tmap}}) {
+ push @{$rmap{$options{tmap}->{$k}}}, $k;
+}
+
+Getopt::Long::Configure("bundling");
+
+# TODO: maybe allow the token map $options{tmap} to be configurable.
+GetOptions(\%options,
+ "help|h",
+ "debug|d",
+ "verbose|v",
+ "file|f=s@",
+ );
+
+if ($options{help}) {
+ my $shortname = basename($0);
+ $shortname =~ s/git-credential-//;
+
+ print <<EOHIPPUS;
+
+$0 [-f AUTHFILE1] [-f AUTHFILEN] [-d] [-v] get
+
+Version $VERSION by tzz\@lifelogs.com. License: BSD.
+
+Options:
+
+ -f|--file AUTHFILE : specify netrc-style files. Files with the .gpg
extension
+ will be decrypted by GPG before parsing. Multiple -f
+ arguments are OK, and the order is respected.
+
+ -d|--debug : turn on debugging (developer info)
+
+ -v|--verbose : be more verbose (show files and information found)
+
+To enable this credential helper:
+
+ git config credential.helper '$shortname -f AUTHFILE1 -f AUTHFILE2'
+
+(Note that Git will prepend "git-credential-" to the helper name and look for
it
+in the path.)
+
+...and if you want lots of debugging info:
+
+ git config credential.helper '$shortname -f AUTHFILE -d'
+
+...or to see the files opened and data found:
+
+ git config credential.helper '$shortname -f AUTHFILE -v'
+
+Only "get" mode is supported by this credential helper. It opens every
AUTHFILE
+and looks for the first entry that matches the requested search criteria:
+
+ 'port|protocol':
+ The protocol that will be used (e.g., https). (protocol=X)
+
+ 'machine|host':
+ The remote hostname for a network credential. (host=X)
+
+ 'path':
+ The path with which the credential will be used. (path=X)
+
+ 'login|user|username':
+ The credential’s username, if we already have one. (username=X)
+
+Thus, when we get this query on STDIN:
+
+protocol=https
+username=tzz
+
+this credential helper will look for the first entry in every AUTHFILE that
+matches
+
+port https login tzz
+
+OR
+
+protocol https login tzz
+
+OR... etc. acceptable tokens as listed above. Any unknown tokens are
+simply ignored.
+
+Then, the helper will print out whatever tokens it got from the entry,
including
+"password" tokens, mapping back to Git's helper protocol; e.g. "port" is mapped
+back to "protocol".
+
+Again, note that the first matching entry from all the AUTHFILEs is used.
+
+Tokens can be quoted as 'STRING' or "STRING".
+
+No caching is performed by this credential helper.
+
+EOHIPPUS
+
+ exit 0;
+}
+
+my $mode = shift @ARGV;
+
+# Credentials must get a parameter, so die if it's missing.
+die "Syntax: $0 [-f AUTHFILE1] [-f AUTHFILEN] [-d] get" unless defined $mode;
+
+# Only support 'get' mode; with any other unsupported ones we just exit.
+exit 0 unless $mode eq 'get';
+
+my $files = $options{file};
+
+# if no files were given, use a predefined list.
+# note that .gpg files come first
+unless (scalar @$files)
+{
+ my @candidates = qw[
+ ~/.authinfo.gpg
+ ~/.netrc.gpg
+ ~/.authinfo
+ ~/.netrc
+ ];
+
+ $files = $options{file} = [ map { glob $_ } @candidates ];
+}
+
+my $query = read_credential_data_from_stdin();
+
+FILE:
+foreach my $file (@$files)
+{
+ unless (-r $file)
+ {
+ log_verbose("Unable to read $file; skipping it");
+ next FILE;
+ }
+
+ # the following check is copied from Net::Netrc
+ # OS/2 and Win32 do not handle stat in a way compatable with this check
:-(
+ unless ($^O eq 'os2'
+ || $^O eq 'MSWin32'
+ || $^O eq 'MacOS'
+ || $^O =~ /^cygwin/)
+ {
+ my @stat = stat($file);
+
+ if (@stat) {
+ if ($stat[2] & 077) {
+ log_verbose("Insecure $file (mode=%04o);
skipping it",
+ $stat[2] & 07777);
+ next FILE;
+ }
+ if ($stat[4] != $<) {
+ log_verbose("Not owner of $file; skipping it");
+ next FILE;
+ }
+ }
+ }
+
+ my $mode = (stat($file))[2];
+ if ($mode & 077)
+ {
+ log_verbose("Insecure $file (mode=%04o); skipping it",
+ $mode & 07777);
+ next FILE;
+ }
+
+ my @entries = load_netrc($file);
+
+ unless (scalar @entries)
+ {
+ if ($!)
+ {
+ log_verbose("Unable to open $file: $!");
+ }
+ else
+ {
+ log_verbose("No netrc entries found in $file");
+ }
+
+ next FILE;
+ }
+
+ my $entry = find_netrc_entry($query, @entries);
+ if ($entry)
+ {
+ print_credential_data($entry, $query);
+ # we're done!
+ last FILE;
+ }
+}
+
+exit 0;
+
+sub load_netrc
+{
+ my $file = shift @_;
+
+ my $io;
+ if ($file =~ m/\.gpg$/) {
+ log_verbose("Using GPG to open $file");
+ # GPG doesn't work well with 2- or 3-argument open
+ $io = new IO::File("gpg --decrypt $file|");
+ }
+ else {
+ log_verbose("Opening $file...");
+ $io = new IO::File($file, '<');
+ }
+
+ # nothing to do if the open failed (we log the error later)
+ return unless $io;
+
+ # Net::Netrc does this, but the functionality is merged with the file
+ # detection logic, so we have to extract just the part we need
+ my @netrc_entries = net_netrc_loader($io);
+
+ # these entries will use the credential helper protocol token names
+ my @entries;
+
+ foreach my $nentry (@netrc_entries) {
+ my %entry;
+ my $num_port;
+
+ if (defined $nentry->{port} && $nentry->{port} =~ m/^\d+$/) {
+ $num_port = $nentry->{port};
+ delete $nentry->{port};
+ }
+
+ # create the new entry for the credential helper protocol
+ $entry{$options{tmap}->{$_}} = $nentry->{$_} foreach keys
%$nentry;
+
+ # for "host X port Y" where Y is an integer (captured by
+ # $num_port above), set the host to "X:Y"
+ if (defined $entry{host} && defined $num_port) {
+ $entry{host} = join(':', $entry{host}, $num_port);
+ }
+
+ push @entries, \%entry;
+ }
+
+ return @entries;
+}
+
+sub net_netrc_loader
+{
+ my $fh = shift @_;
+ my @entries;
+ my ($mach, $macdef, $tok, @tok) = (0, 0);
+
+ LINE:
+ while (<$fh>) {
+ undef $macdef if /\A\n\Z/;
+
+ if ($macdef) {
+ push(@$macdef, $_);
+ next LINE;
+ }
+
+ s/^\s*//;
+ chomp;
+
+ while (length &&
s/^("((?:[^"]+|\\.)*)"|((?:[^\\\s]+|\\.)*))\s*//) {
+ (my $tok = $+) =~ s/\\(.)/$1/g;
+ push(@tok, $tok);
+ }
+
+ TOKEN:
+ while (@tok) {
+ $tok = shift(@tok);
+
+ if ($tok eq "machine") {
+ my $host = shift @tok;
+ $mach = { machine => $host };
+ push @entries, $mach;
+ }
+ elsif (exists $options{tmap}->{$tok}) {
+ unless ($mach) {
+ log_debug("Skipping token $tok because
no machine was given");
+ next TOKEN;
+ }
+
+ my $value = shift @tok;
+ unless (defined $value) {
+ log_debug("Token $tok had no value,
skipping it.");
+ next TOKEN;
+ }
+
+ # Following line added by rmerrell to remove
'/' escape char in .netrc
+ $value =~ s/\/\\/\\/g;
+ $mach->{$tok} = $value;
+ }
+ elsif ($tok eq "macdef") { # we ignore macros
+ next TOKEN unless $mach;
+ my $value = shift @tok;
+ $mach->{macdef} = {} unless exists
$mach->{macdef};
+ $macdef = $mach->{machdef}{$value} = [];
+ }
+ }
+ }
+
+ return @entries;
+}
+
+sub read_credential_data_from_stdin
+{
+ # the query: start with every token with no value
+ my %q = map { $_ => undef } values(%{$options{tmap}});
+
+ while (<STDIN>) {
+ next unless m/^([^=]+)=(.+)/;
+
+ my ($token, $value) = ($1, $2);
+ die "Unknown search token $token" unless exists $q{$token};
+ $q{$token} = $value;
+ log_debug("We were given search token $token and value $value");
+ }
+
+ foreach (sort keys %q) {
+ log_debug("Searching for %s = %s", $_, $q{$_} || '(any value)');
+ }
+
+ return \%q;
+}
+
+# takes the search tokens and then a list of entries
+# each entry is a hash reference
+sub find_netrc_entry
+{
+ my $query = shift @_;
+
+ ENTRY:
+ foreach my $entry (@_)
+ {
+ my $entry_text = join ', ', map { "$_=$entry->{$_}" } keys
%$entry;
+ foreach my $check (sort keys %$query) {
+ if (defined $query->{$check}) {
+ log_debug("compare %s [%s] to [%s] (entry: %s)",
+ $check,
+ $entry->{$check},
+ $query->{$check},
+ $entry_text);
+ unless ($query->{$check} eq $entry->{$check}) {
+ next ENTRY;
+ }
+ }
+ else {
+ log_debug("OK: any value satisfies check
$check");
+ }
+ }
+
+ return $entry;
+ }
+
+ # nothing was found
+ return;
+}
+
+sub print_credential_data
+{
+ my $entry = shift @_;
+ my $query = shift @_;
+
+ log_debug("entry has passed all the search checks");
+ TOKEN:
+ foreach my $git_token (sort keys %$entry) {
+ log_debug("looking for useful token $git_token");
+ # don't print unknown (to the credential helper protocol) tokens
+ next TOKEN unless exists $query->{$git_token};
+
+ # don't print things asked in the query (the entry matches them)
+ next TOKEN if defined $query->{$git_token};
+
+ log_debug("FOUND: $git_token=$entry->{$git_token}");
+ printf "%s=%s\n", $git_token, $entry->{$git_token};
+ }
+}
+sub log_verbose {
+ return unless $options{verbose};
+ printf STDERR @_;
+ printf STDERR "\n";
+}
+
+sub log_debug {
+ return unless $options{debug};
+ printf STDERR @_;
+ printf STDERR "\n";
+}
--
1.7.9.rc2
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