contrib/credential/netrc/git-credential-netrc - jrn/git - Git at Google

 #!/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,
 	       insecure => 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",
            "insecure|k",
            "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] [-k] 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.  They are processed in order, and the
                        first matching entry found is returned via the credential
                        helper protocol (see below).

                        When no -f option is given, .authinfo.gpg, .netrc.gpg,
 		       .authinfo, and .netrc files in your home directory are used
 		       in this order.

   -k|--insecure      : ignore bad file ownership or permissions

   -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:

 host=github.com
 protocol=https
 username=tzz

 this credential helper will look for the first entry in every AUTHFILE that
 matches

 machine github.com port https login tzz

 OR

 machine github.com 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".  Any redundant entry tokens (part of the original query) are
 skipped.

 Again, note that only the first matching entry from all the AUTHFILEs, processed
 in the sequence given on the command line, is used.

 Netrc/authinfo 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) {
 	my $gpgmode = $file =~ m/\.gpg$/;
 	unless (-r $file) {
 		log_verbose("Unable to read $file; skipping it");
 		next FILE;
 	}

 	# the following check is copied from Net::Netrc, for non-GPG files
 	# OS/2 and Win32 do not handle stat in a way compatible with this check :-(
 	unless ($gpgmode || $options{insecure} ||
 		$^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 @entries = load_netrc($file, $gpgmode);

 	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 $gpgmode = shift @_;

 	my $io;
 	if ($gpgmode) {
 		my @cmd = (qw(gpg --decrypt), $file);
 		log_verbose("Using GPG to open $file: [@cmd]");
 		open $io, "-|", @cmd;
 	} else {
 		log_verbose("Opening $file...");
 		open $io, '<', $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->{machine}) {
 			next;
 		}
 		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);

     LINE:
 	while (<$fh>) {
 		undef $macdef if /\A\n\Z/;

 		if ($macdef) {
 			next LINE;
 		}

 		s/^\s*//;
 		chomp;

 		while (length && s/^("((?:[^"]+|\\.)*)"|((?:[^\\\s]+|\\.)*))\s*//) {
 			(my $tok = $+) =~ s/\\(.)/$1/g;
 			push(@tok, $tok);
 		}

 	    TOKEN:
 		while (@tok) {
 			if ($tok[0] eq "default") {
 				shift(@tok);
 				$mach = { machine => undef };
 				next TOKEN;
 			}

 			$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;
 				$macdef = 1;
 			}
 		}
 	}

 	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 $entry->{$check}) {
 			        log_debug("OK: entry has no $check token, so any value satisfies check $check");
 			} elsif (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";
 }
	#!/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,
	insecure => 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",
	"insecure\|k",
	"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] [-k] 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. They are processed in order, and the
	first matching entry found is returned via the credential
	helper protocol (see below).

	When no -f option is given, .authinfo.gpg, .netrc.gpg,
	.authinfo, and .netrc files in your home directory are used
	in this order.

	-k\|--insecure : ignore bad file ownership or permissions

	-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:

	host=github.com
	protocol=https
	username=tzz

	this credential helper will look for the first entry in every AUTHFILE that
	matches

	machine github.com port https login tzz

	OR

	machine github.com 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". Any redundant entry tokens (part of the original query) are
	skipped.

	Again, note that only the first matching entry from all the AUTHFILEs, processed
	in the sequence given on the command line, is used.

	Netrc/authinfo 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) {
	my $gpgmode = $file =~ m/\.gpg$/;
	unless (-r $file) {
	log_verbose("Unable to read $file; skipping it");
	next FILE;
	}

	# the following check is copied from Net::Netrc, for non-GPG files
	# OS/2 and Win32 do not handle stat in a way compatible with this check :-(
	unless ($gpgmode \|\| $options{insecure} \|\|
	$^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 @entries = load_netrc($file, $gpgmode);

	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 $gpgmode = shift @_;

	my $io;
	if ($gpgmode) {
	my @cmd = (qw(gpg --decrypt), $file);
	log_verbose("Using GPG to open $file: [@cmd]");
	open $io, "-\|", @cmd;
	} else {
	log_verbose("Opening $file...");
	open $io, '<', $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->{machine}) {
	next;
	}
	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);

	LINE:
	while (<$fh>) {
	undef $macdef if /\A\n\Z/;

	if ($macdef) {
	next LINE;
	}

	s/^\s*//;
	chomp;

	while (length && s/^("((?:[^"]+\|\\.))"\|((?:[^\\\s]+\|\\.)))\s*//) {
	(my $tok = $+) =~ s/\\(.)/$1/g;
	push(@tok, $tok);
	}

	TOKEN:
	while (@tok) {
	if ($tok[0] eq "default") {
	shift(@tok);
	$mach = { machine => undef };
	next TOKEN;
	}

	$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;
	$macdef = 1;
	}
	}
	}

	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 $entry->{$check}) {
	log_debug("OK: entry has no $check token, so any value satisfies check $check");
	} elsif (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";
	}