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GetUserId() changes to has_privs_of_role()

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The pg_stat and pg_signal-related functions have been using GetUserId()
instead of has_privs_of_role() for checking if the current user should
be able to see details in pg_stat_activity or signal other processes,
requiring a user to do 'SET ROLE' for inheirited roles for a permissions
check, unlike other permissions checks.

This patch changes that behavior to, instead, act like most other
permission checks and use has_privs_of_role(), removing the 'SET ROLE'
need.  Documentation and error messages updated accordingly.

Per discussion with Alvaro, Peter, Adam (though not using Adam's patch),
and Robert.

Reviewed by Jeevan Chalke.
pull/14/head
Stephen Frost 11 years ago
parent 12968cf408
commit bf03889996
3 changed files with 47 additions and 24 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 13
      doc/src/sgml/func.sgml
  2. 39
      src/backend/utils/adt/misc.c
  3. 19
      src/backend/utils/adt/pgstatfuncs.c

13
doc/src/sgml/func.sgml
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@ -16328,9 +16328,9 @@ SELECT set_config('log_statement_stats', 'off', false);
<literal><function>pg_cancel_backend(<parameter>pid</parameter> <type>int</>)</function></literal>
</entry>
<entry><type>boolean</type></entry>
<entry>Cancel a backend's current query. You can execute this against
another backend that has exactly the same role as the user calling the
function. In all other cases, you must be a superuser.
<entry>Cancel a backend's current query. This is also allowed if the
calling role is a member of the role whose backend is being cancelled,
however only superusers can cancel superuser backends.
</entry>
</row>
<row>
@ -16352,10 +16352,9 @@ SELECT set_config('log_statement_stats', 'off', false);
<literal><function>pg_terminate_backend(<parameter>pid</parameter> <type>int</>)</function></literal>
</entry>
<entry><type>boolean</type></entry>
<entry>Terminate a backend. You can execute this against
another backend that has exactly the same role as the user
calling the function. In all other cases, you must be a
superuser.
<entry>Terminate a backend. This is also allowed if the calling role
is a member of the role whose backend is being terminated, however only
superusers can terminate superuser backends.
</entry>
</row>
</tbody>

39
src/backend/utils/adt/misc.c
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@ -37,6 +37,7 @@
#include "utils/lsyscache.h"
#include "utils/ruleutils.h"
#include "tcop/tcopprot.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/timestamp.h"
@ -81,7 +82,9 @@ current_query(PG_FUNCTION_ARGS)
* role as the backend being signaled. For "dangerous" signals, an explicit
* check for superuser needs to be done prior to calling this function.
*
* Returns 0 on success, 1 on general failure, and 2 on permission error.
* Returns 0 on success, 1 on general failure, 2 on normal permission error
* and 3 if the caller needs to be a superuser.
*
* In the event of a general failure (return code 1), a warning message will
* be emitted. For permission errors, doing that is the responsibility of
* the caller.
@ -89,6 +92,7 @@ current_query(PG_FUNCTION_ARGS)
#define SIGNAL_BACKEND_SUCCESS 0
#define SIGNAL_BACKEND_ERROR 1
#define SIGNAL_BACKEND_NOPERMISSION 2
#define SIGNAL_BACKEND_NOSUPERUSER 3
static int
pg_signal_backend(int pid, int sig)
{
@ -113,7 +117,12 @@ pg_signal_backend(int pid, int sig)
return SIGNAL_BACKEND_ERROR;
}
if (!(superuser() || proc->roleId == GetUserId()))
/* Only allow superusers to signal superuser-owned backends. */
if (superuser_arg(proc->roleId) && !superuser())
return SIGNAL_BACKEND_NOSUPERUSER;
/* Users can signal backends they have role membership in. */
if (!has_privs_of_role(GetUserId(), proc->roleId))
return SIGNAL_BACKEND_NOPERMISSION;
/*
@ -141,35 +150,49 @@ pg_signal_backend(int pid, int sig)
}
/*
* Signal to cancel a backend process. This is allowed if you are superuser or
* have the same role as the process being canceled.
* Signal to cancel a backend process. This is allowed if you are a member of
* the role whose process is being canceled.
*
* Note that only superusers can signal superuser-owned processes.
*/
Datum
pg_cancel_backend(PG_FUNCTION_ARGS)
{
int r = pg_signal_backend(PG_GETARG_INT32(0), SIGINT);
if (r == SIGNAL_BACKEND_NOSUPERUSER)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be a superuser to cancel superuser query"))));
if (r == SIGNAL_BACKEND_NOPERMISSION)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser or have the same role to cancel queries running in other server processes"))));
(errmsg("must be a member of the role whose query is being cancelled"))));
PG_RETURN_BOOL(r == SIGNAL_BACKEND_SUCCESS);
}
/*
* Signal to terminate a backend process. This is allowed if you are superuser
* or have the same role as the process being terminated.
* Signal to terminate a backend process. This is allowed if you are a member
* of the role whose process is being terminated.
*
* Note that only superusers can signal superuser-owned processes.
*/
Datum
pg_terminate_backend(PG_FUNCTION_ARGS)
{
int r = pg_signal_backend(PG_GETARG_INT32(0), SIGTERM);
if (r == SIGNAL_BACKEND_NOSUPERUSER)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be a superuser to terminate superuser process"))));
if (r == SIGNAL_BACKEND_NOPERMISSION)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser or have the same role to terminate other server processes"))));
(errmsg("must be a member of the role whose process is being terminated"))));
PG_RETURN_BOOL(r == SIGNAL_BACKEND_SUCCESS);
}

19
src/backend/utils/adt/pgstatfuncs.c
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@ -20,6 +20,7 @@
#include "libpq/ip.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/inet.h"
#include "utils/timestamp.h"
@ -675,8 +676,8 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
else
nulls[15] = true;
/* Values only available to same user or superuser */
if (superuser() || beentry->st_userid == GetUserId())
/* Values only available to role member */
if (has_privs_of_role(GetUserId(), beentry->st_userid))
{
SockAddr zero_clientaddr;
@ -878,7 +879,7 @@ pg_stat_get_backend_activity(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
activity = "<backend information not available>";
else if (!superuser() && beentry->st_userid != GetUserId())
else if (!has_privs_of_role(GetUserId(), beentry->st_userid))
activity = "<insufficient privilege>";
else if (*(beentry->st_activity) == '\0')
activity = "<command string not enabled>";
@ -899,7 +900,7 @@ pg_stat_get_backend_waiting(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
if (!has_privs_of_role(GetUserId(), beentry->st_userid))
PG_RETURN_NULL();
result = beentry->st_waiting;
@ -918,7 +919,7 @@ pg_stat_get_backend_activity_start(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
if (!has_privs_of_role(GetUserId(), beentry->st_userid))
PG_RETURN_NULL();
result = beentry->st_activity_start_timestamp;
@ -944,7 +945,7 @@ pg_stat_get_backend_xact_start(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
if (!has_privs_of_role(GetUserId(), beentry->st_userid))
PG_RETURN_NULL();
result = beentry->st_xact_start_timestamp;
@ -966,7 +967,7 @@ pg_stat_get_backend_start(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
if (!has_privs_of_role(GetUserId(), beentry->st_userid))
PG_RETURN_NULL();
result = beentry->st_proc_start_timestamp;
@ -990,7 +991,7 @@ pg_stat_get_backend_client_addr(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
if (!has_privs_of_role(GetUserId(), beentry->st_userid))
PG_RETURN_NULL();
/* A zeroed client addr means we don't know */
@ -1037,7 +1038,7 @@ pg_stat_get_backend_client_port(PG_FUNCTION_ARGS)
if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
PG_RETURN_NULL();
if (!superuser() && beentry->st_userid != GetUserId())
if (!has_privs_of_role(GetUserId(), beentry->st_userid))
PG_RETURN_NULL();
/* A zeroed client addr means we don't know */

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