*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/libpq/auth.c,v 1.34 1999/03/14 16:06:42 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/libpq/auth.c,v 1.35 1999/04/16 04:59:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/*
- * Tell the user the authentication failed, but not why.
+ * Tell the user the authentication failed, but not (much about) why.
+ *
+ * There is a tradeoff here between security concerns and making life
+ * unnecessarily difficult for legitimate users. We would not, for example,
+ * want to report the password we were expecting to receive...
+ * But it seems useful to report the username and authorization method
+ * in use, and these are items that must be presumed known to an attacker
+ * anyway.
+ * Note that many sorts of failure report additional information in the
+ * postmaster log, which we hope is only readable by good guys.
*/
void
auth_failed(Port *port)
{
- PacketSendError(&port->pktInfo, "User authentication failed");
+ char buffer[512];
+ const char *authmethod = "Unknown auth method:";
+
+ switch (port->auth_method)
+ {
+ case uaReject:
+ authmethod = "Rejected host:";
+ break;
+ case uaKrb4:
+ authmethod = "Kerberos4";
+ break;
+ case uaKrb5:
+ authmethod = "Kerberos5";
+ break;
+ case uaTrust:
+ authmethod = "Trusted";
+ break;
+ case uaIdent:
+ authmethod = "IDENT";
+ break;
+ case uaPassword:
+ authmethod = "Password";
+ break;
+ case uaCrypt:
+ authmethod = "Password";
+ break;
+ }
+
+ sprintf(buffer, "%s authentication failed for user '%s'",
+ authmethod, port->user);
+
+ PacketSendError(&port->pktInfo, buffer);
}
/*
* Get the authentication method to use for this frontend/database
- * combination.
+ * combination. Note: a failure return indicates a problem with
+ * the hba config file, not with the request. hba.c should have
+ * dropped an error message into the postmaster logfile if it failed.
*/
if (hba_getauthmethod(&port->raddr, port->user, port->database,
port->auth_arg, &port->auth_method) != STATUS_OK)
- PacketSendError(&port->pktInfo, "Missing or mis-configured pg_hba.conf file");
+ PacketSendError(&port->pktInfo,
+ "Missing or erroneous pg_hba.conf file, see postmaster log for details");
else if (PG_PROTOCOL_MAJOR(port->proto) == 0)
{
}
else
{
- AuthRequest areq;
- PacketDoneProc auth_handler;
-
- /* Keep the compiler quiet. */
-
- areq = AUTH_REQ_OK;
-
/* Handle new style authentication. */
- auth_handler = NULL;
+ AuthRequest areq = AUTH_REQ_OK;
+ PacketDoneProc auth_handler = NULL;
switch (port->auth_method)
{
case uaReject:
+ /*
+ * This could have come from an explicit "reject" entry
+ * in pg_hba.conf, but more likely it means there was no
+ * matching entry. Take pity on the poor user and issue
+ * a helpful error message. NOTE: this is not a security
+ * breach, because all the info reported here is known
+ * at the frontend and must be assumed known to bad guys.
+ * We're merely helping out the less clueful good guys.
+ * NOTE 2: libpq-be.h defines the maximum error message
+ * length as 99 characters. It probably wouldn't hurt
+ * anything to increase it, but there might be some
+ * client out there that will fail. So, be terse.
+ */
+ {
+ char buffer[512];
+ const char *hostinfo = "localhost";
+
+ if (port->raddr.sa.sa_family == AF_INET)
+ hostinfo = inet_ntoa(port->raddr.in.sin_addr);
+ sprintf(buffer,
+ "No pg_hba.conf entry for host %s, user %s, database %s",
+ hostinfo, port->user, port->database);
+ PacketSendError(&port->pktInfo, buffer);
+ return;
+ }
break;
case uaKrb4:
* wherein you authenticate a user by seeing what IP address the system
* says he comes from and possibly using ident).
*
- * $Id: hba.c,v 1.39 1999/02/13 23:15:43 momjian Exp $
+ * $Id: hba.c,v 1.40 1999/04/16 04:59:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
static void
process_open_config_file(FILE *file, SockAddr *raddr, const char *user,
- const char *database, bool *host_ok_p,
+ const char *database, bool *hba_ok_p,
UserAuth *userauth_p, char *auth_arg)
{
/*---------------------------------------------------------------------------
This function does the same thing as find_hba_entry, only with
the config file already open on stream descriptor "file".
----------------------------------------------------------------------------*/
- bool found_entry;
+ bool found_entry = false; /* found an applicable entry? */
+ bool error = false; /* found an erroneous entry? */
+ bool eof = false; /* end of hba file */
- /* We've processed a record that applies to our connection */
- bool error;
-
- /* Said record has invalid syntax. */
- bool eof; /* We've reached the end of the file we're
- * reading */
-
- found_entry = false; /* initial value */
- error = false; /* initial value */
- eof = false; /* initial value */
while (!eof && !found_entry && !error)
{
/* Process a line from the config file */
-
- int c; /* a character read from the file */
-
- c = getc(file);
- ungetc(c, file);
+ int c = getc(file);
if (c == EOF)
eof = true;
else
{
+ ungetc(c, file);
if (c == '#')
read_through_eol(file);
else
- {
process_hba_record(file, raddr, user, database,
&found_entry, &error, userauth_p, auth_arg);
- }
}
}
if (!error)
{
- /* If no entry was found then force a rejection. */
+ /* If no matching entry was found, synthesize 'reject' entry. */
if (!found_entry)
*userauth_p = uaReject;
- *host_ok_p = true;
+ *hba_ok_p = true;
}
}
static void
find_hba_entry(SockAddr *raddr, const char *user, const char *database,
- bool *host_ok_p, UserAuth *userauth_p, char *auth_arg)
+ bool *hba_ok_p, UserAuth *userauth_p, char *auth_arg)
{
/*
* Read the config file and find an entry that allows connection from
- * host "*raddr" to database "database". If found, return *host_ok_p == true
- * and *userauth_p and *auth_arg representing the contents of that entry.
- *
- * When a record has invalid syntax, we either ignore it or reject the
- * connection (depending on where it's invalid). No message or anything.
- * We need to fix that some day.
+ * host "raddr", user "user", to database "database". If found,
+ * return *hba_ok_p = true and *userauth_p and *auth_arg representing
+ * the contents of that entry. If there is no matching entry, we
+ * set *hba_ok_p = true, *userauth_p = uaReject.
*
- * If we don't find or can't access the config file, we issue an error
- * message and deny the connection.
+ * If the config file is unreadable or contains invalid syntax, we
+ * issue a diagnostic message to stderr (ie, the postmaster log file)
+ * and return without changing *hba_ok_p.
*
* If we find a file by the old name of the config file (pg_hba), we issue
* an error message because it probably needs to be converted. He didn't
* follow directions and just installed his old hba file in the new database
* system.
- *
*/
int fd,
}
else
{
- process_open_config_file(file, raddr, user, database, host_ok_p,
+ process_open_config_file(file, raddr, user, database, hba_ok_p,
userauth_p, auth_arg);
FreeFile(file);
}
pfree(conf_file);
}
pfree(old_conf_file);
- return;
}
#endif
-extern int
+int
hba_getauthmethod(SockAddr *raddr, char *user, char *database,
char *auth_arg, UserAuth *auth_method)
{
/*---------------------------------------------------------------------------
Determine what authentication method should be used when accessing database
- "database" from frontend "raddr". Return the method, an optional argument,
- and STATUS_OK.
+ "database" from frontend "raddr", user "user". Return the method,
+ an optional argument, and STATUS_OK.
+ Note that STATUS_ERROR indicates a problem with the hba config file.
+ If the file is OK but does not contain any entry matching the request,
+ we return STATUS_OK and method = uaReject.
----------------------------------------------------------------------------*/
- bool host_ok;
-
- host_ok = false;
+ bool hba_ok = false;
- find_hba_entry(raddr, user, database, &host_ok, auth_method, auth_arg);
+ find_hba_entry(raddr, user, database, &hba_ok, auth_method, auth_arg);
- return host_ok ? STATUS_OK : STATUS_ERROR;
+ return hba_ok ? STATUS_OK : STATUS_ERROR;
}
projects / postgresql / commitdiff