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package Protocol::DBus::Authn::Mechanism::EXTERNAL; |
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2088
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use strict; |
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112
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use warnings; |
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use parent 'Protocol::DBus::Authn::Mechanism'; |
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use Protocol::DBus::Socket (); |
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1356
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# The methods of user credential retrieval that the reference D-Bus |
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# server relies on prefer “out-of-band” methods like SO_PEERCRED |
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# on Linux rather than SCM_CREDS. (See See dbus/dbus-sysdeps-unix.c.) |
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# So for some OSes it’s just not necessary to do anything special to |
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# send credentials. |
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# |
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# On other OSes it doesn’t seem possible to send credentials via a |
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# UNIX socket in the first place. But let’s still try. |
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# |
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our @OS_NO_MSGHDR_LIST = ( |
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# Reference server doesn’t need our help: |
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'linux', |
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'netbsd', # via LOCAL_PEEREID, which dbus calls |
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# LOCAL_PEERCRED exists and works, but the reference server |
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# doesn’t appear to use it. Nonetheless, EXTERNAL authn works |
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# on these OSes. Maybe getpeereid() calls LOCAL_PEERCRED? |
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'freebsd', # NB: doesn’t work w/ socketpair() |
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'gnukfreebsd', # ditto, probably |
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'darwin', |
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# 'openbsd', ??? Still trying to test. |
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# No way to pass credentials via UNIX socket, |
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# so let’s just send EXTERNAL and see what happens. |
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# It’ll likely just fail over to DBUS_COOKIE_SHA1. |
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'cygwin', |
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'mswin32', |
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); |
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1
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1
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0
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sub INITIAL_RESPONSE { unpack 'H*', $> } |
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# The reference server implementation does a number of things to try to |
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# fetch the peer credentials. . |
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sub must_send_initial { |
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0
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my ($self) = @_; |
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6
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100
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if (!defined $self->{'_must_send_initial'}) { |
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5
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my $can_skip_msghdr = grep { $_ eq $^O } @OS_NO_MSGHDR_LIST; |
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$can_skip_msghdr ||= eval { my $v = Socket::SO_PEERCRED(); 1 }; |
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$can_skip_msghdr ||= eval { my $v = Socket::LOCAL_PEEREID(); 1 }; |
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0
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0
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54
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55
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# As of this writing it seems FreeBSD and DragonflyBSD do require |
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# Socket::MsgHdr, even though they both have LOCAL_PEERCRED which |
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# should take care of that. |
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5
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$self->{'_must_send_initial'} = !$can_skip_msghdr; |
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} |
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61
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6
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return $self->{'_must_send_initial'}; |
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} |
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64
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sub send_initial { |
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0
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0
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my ($self, $s) = @_; |
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0
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eval { require Socket::MsgHdr; 1 } or do { |
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0
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68
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0
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die "Socket::MsgHdr appears to be needed for EXTERNAL authn (OS=$^O) but failed to load: $@"; |
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}; |
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71
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0
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my $msg = Socket::MsgHdr->new( buf => "\0" ); |
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# The kernel should fill in the payload. |
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0
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$msg->cmsghdr( Socket::SOL_SOCKET(), Socket::SCM_CREDS(), "\0" x 64 ); |
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76
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0
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local $!; |
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0
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my $ok = Protocol::DBus::Socket::sendmsg_nosignal($s, $msg, 0); |
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79
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0
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0
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if (!$ok && !$!{'EAGAIN'}) { |
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0
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die "sendmsg($s): $!"; |
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} |
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83
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0
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return $ok; |
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} |
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86
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1; |