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socket: add option for SO_PASSEC

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=798760

(Note that this work is not complete yet, as the kernel seems to send us
useless data with SCM_SECURITY enabled)
This commit is contained in:
Lennart Poettering 2012-03-13 00:00:27 +01:00
parent fa734f4da8
commit 54ecda32c6
11 changed files with 43 additions and 1 deletions
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2
TODO
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@ -18,6 +18,8 @@ Bugfixes:
Features:
* journal: extend sd-journal.h logging calls to implicitly log function names/line numbers/...
* document crypttab(5)
* There's currently no way to cancel fsck (used to be possible via C-c or c on the console)

13
man/systemd.socket.xml
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@ -528,13 +528,24 @@
<term><varname>PassCredentials=</varname></term>
<listitem><para>Takes a boolean
value. This controls the SO_PASSCRED
socket option, which allows UNIX sockets to
socket option, which allows AF_UNIX sockets to
receive the credentials of the sending
process in an ancillary message.
Defaults to
<option>false</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>PassSecurity=</varname></term>
<listitem><para>Takes a boolean
value. This controls the SO_PASSSEC
socket option, which allows AF_UNIX
sockets to receive the security
context of the sending process in an
ancillary message. Defaults to
<option>false</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>TCPCongestion=</varname></term>
<listitem><para>Takes a string

2
src/dbus-socket.c
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@ -52,6 +52,7 @@
" <property name=\"Transparent\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"Broadcast\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"PassCredentials\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"PassSecurity\" type=\"b\" access=\"read\"/>\n" \
" <property name=\"Mark\" type=\"i\" access=\"read\"/>\n" \
" <property name=\"MaxConnections\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"NAccepted\" type=\"u\" access=\"read\"/>\n" \
@ -114,6 +115,7 @@ static const BusProperty bus_socket_properties[] = {
{ "Transparent", bus_property_append_bool, "b", offsetof(Socket, transparent) },
{ "Broadcast", bus_property_append_bool, "b", offsetof(Socket, broadcast) },
{ "PassCredentials",bus_property_append_bool, "b", offsetof(Socket, pass_cred) },
{ "PassSecurity", bus_property_append_bool, "b", offsetof(Socket, pass_sec) },
{ "Mark", bus_property_append_int, "i", offsetof(Socket, mark) },
{ "MaxConnections", bus_property_append_unsigned, "u", offsetof(Socket, max_connections) },
{ "NConnections", bus_property_append_unsigned, "u", offsetof(Socket, n_connections) },

10
src/journal/journald.c
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@ -2252,6 +2252,11 @@ static int open_syslog_socket(Server *s) {
return -errno;
}
one = 1;
r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
if (r < 0)
log_warning("SO_PASSSEC failed: %m");
one = 1;
r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
if (r < 0) {
@ -2308,6 +2313,11 @@ static int open_native_socket(Server*s) {
return -errno;
}
one = 1;
r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
if (r < 0)
log_warning("SO_PASSSEC failed: %m");
one = 1;
r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
if (r < 0) {

1
src/load-fragment-gperf.gperf.m4
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@ -186,6 +186,7 @@ Socket.FreeBind, config_parse_bool, 0,
Socket.Transparent, config_parse_bool, 0, offsetof(Socket, transparent)
Socket.Broadcast, config_parse_bool, 0, offsetof(Socket, broadcast)
Socket.PassCredentials, config_parse_bool, 0, offsetof(Socket, pass_cred)
Socket.PassSecurity, config_parse_bool, 0, offsetof(Socket, pass_sec)
Socket.TCPCongestion, config_parse_string, 0, offsetof(Socket, tcp_congestion)
Socket.MessageQueueMaxMessages, config_parse_long, 0, offsetof(Socket, mq_maxmsg)
Socket.MessageQueueMessageSize, config_parse_long, 0, offsetof(Socket, mq_msgsize)

4
src/missing.h
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@ -180,4 +180,8 @@ static inline pid_t gettid(void) {
return (pid_t) syscall(SYS_gettid);
}
#ifndef SCM_SECURITY
#define SCM_SECURITY 0x03
#endif
#endif

8
src/socket.c
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@ -417,6 +417,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
"%sTransparent: %s\n"
"%sBroadcast: %s\n"
"%sPassCredentials: %s\n"
"%sPassSecurity: %s\n"
"%sTCPCongestion: %s\n",
prefix, socket_state_to_string(s->state),
prefix, socket_result_to_string(s->result),
@ -429,6 +430,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
prefix, yes_no(s->transparent),
prefix, yes_no(s->broadcast),
prefix, yes_no(s->pass_cred),
prefix, yes_no(s->pass_sec),
prefix, strna(s->tcp_congestion));
if (s->control_pid > 0)
@ -676,6 +678,12 @@ static void socket_apply_socket_options(Socket *s, int fd) {
log_warning("SO_PASSCRED failed: %m");
}
if (s->pass_sec) {
int one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
log_warning("SO_PASSSEC failed: %m");
}
if (s->priority >= 0)
if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
log_warning("SO_PRIORITY failed: %m");

1
src/socket.h
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@ -129,6 +129,7 @@ struct Socket {
bool transparent;
bool broadcast;
bool pass_cred;
bool pass_sec;
int priority;
int mark;
size_t receive_buffer;

1
units/syslog.socket
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@ -21,6 +21,7 @@ Wants=syslog.target
ListenDatagram=/run/systemd/journal/syslog
SocketMode=0666
PassCredentials=yes
PassSecurity=yes
ReceiveBuffer=8M
# The default syslog implementation should make syslog.service a

1
units/systemd-journald.socket
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@ -23,4 +23,5 @@ ListenDatagram=/run/systemd/journal/socket
ListenDatagram=/dev/log
SocketMode=0666
PassCredentials=yes
PassSecurity=yes
ReceiveBuffer=8M

1
units/systemd-shutdownd.socket
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@ -16,3 +16,4 @@ Before=sockets.target
ListenDatagram=/run/systemd/shutdownd
SocketMode=0600
PassCredentials=yes
PassSecurity=yes