diff options
author | Tom Lane <tgl@sss.pgh.pa.us> | 2008-01-03 21:28:42 +0000 |
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committer | Tom Lane <tgl@sss.pgh.pa.us> | 2008-01-03 21:28:42 +0000 |
commit | f39ff783bc147db38136b4f144c3388a7b8305a7 (patch) | |
tree | 15984ff352e4e48997e3c6bdc445593087016231 /contrib/dblink | |
parent | 108b19d8609af994f8fa69cd0d8e15a2807a1367 (diff) | |
download | postgresql-f39ff783bc147db38136b4f144c3388a7b8305a7.tar.gz |
The original patch to disallow non-passworded connections to non-superusers
failed to cover all the ways in which a connection can be initiated in dblink.
Plug the remaining holes. Also, disallow transient connections in functions
for which that feature makes no sense (because they are only sensible as
part of a sequence of operations on the same connection). Joe Conway
Security: CVE-2007-6601
Diffstat (limited to 'contrib/dblink')
-rw-r--r-- | contrib/dblink/dblink.c | 50 |
1 files changed, 29 insertions, 21 deletions
diff --git a/contrib/dblink/dblink.c b/contrib/dblink/dblink.c index ac43b897b3..68f4ac27c3 100644 --- a/contrib/dblink/dblink.c +++ b/contrib/dblink/dblink.c @@ -85,6 +85,7 @@ static HeapTuple get_tuple_of_interest(Oid relid, int16 *pkattnums, int16 pknuma static Oid get_relid_from_relname(text *relname_text); static char *generate_relation_name(Oid relid); static char *connstr_strip_password(const char *connstr); +static void dblink_security_check(PGconn *conn, remoteConn *rcon, const char *connstr); /* Global */ List *res_id = NIL; @@ -168,6 +169,7 @@ typedef struct remoteConnHashEnt else \ { \ connstr = conname_or_str; \ + dblink_security_check(conn, rcon, connstr); \ conn = PQconnectdb(connstr); \ if (PQstatus(conn) == CONNECTION_BAD) \ { \ @@ -210,27 +212,8 @@ dblink_connect(PG_FUNCTION_ARGS) if (connname) rcon = (remoteConn *) palloc(sizeof(remoteConn)); - /* for non-superusers, check that server requires a password */ - if (!superuser()) - { - /* this attempt must fail */ - conn = PQconnectdb(connstr_strip_password(connstr)); - - if (PQstatus(conn) == CONNECTION_OK) - { - PQfinish(conn); - if (rcon) - pfree(rcon); - - ereport(ERROR, - (errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED), - errmsg("password is required"), - errdetail("Non-superuser cannot connect if the server does not request a password."), - errhint("Target server's authentication method must be changed."))); - } - else - PQfinish(conn); - } + /* check password used if not superuser */ + dblink_security_check(conn, rcon, connstr); conn = PQconnectdb(connstr); MemoryContextSwitchTo(oldcontext); @@ -2269,3 +2252,28 @@ connstr_strip_password(const char *connstr) return result.data; } + +static void +dblink_security_check(PGconn *conn, remoteConn *rcon, const char *connstr) +{ + if (!superuser()) + { + /* this attempt must fail */ + conn = PQconnectdb(connstr_strip_password(connstr)); + + if (PQstatus(conn) == CONNECTION_OK) + { + PQfinish(conn); + if (rcon) + pfree(rcon); + + ereport(ERROR, + (errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED), + errmsg("password is required"), + errdetail("Non-superuser cannot connect if the server does not request a password."), + errhint("Target server's authentication method must be changed."))); + } + else + PQfinish(conn); + } +} |