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Code Issues Releases Wiki Activity

Better validate MODE +k & +l parameters and return errors

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Implement new numeric ERR_INVALIDMODEPARAM_MSG(696) and:

- Reject channel keys with spaces and return ERR_INVALIDMODEPARAM_MSG;
  This was possible until now and resulted in garbled IRC commands later.
- Reject empty channel keys and return ERR_INVALIDMODEPARAM_MSG;
  This was possible until now and resulted in garbled IRC commands later.
- Return ERR_INVALIDMODEPARAM_MSG when user limit is out of bounds;
  This was silently ignored until now.

Closes #290. Thanks Val Lorentz for reporting it!
This commit is contained in:
Alexander Barton 2023-01-02 22:32:16 +01:00
parent 3c9c54989e
commit 8e9c789ae1
2 changed files with 32 additions and 8 deletions
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36
src/ngircd/irc-mode.c
View File

@ -620,6 +620,18 @@ Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
Client_ID(Origin), Req->command);
goto chan_exit;
}
if (!Req->argv[arg_arg][0] || strchr(Req->argv[arg_arg], ' ')) {
if (is_machine)
Log(LOG_ERR,
"Got invalid key on MODE +k for \"%s\" from \"%s\"! Ignored.",
Channel_Name(Channel), Client_ID(Origin));
else
connected = IRC_WriteErrClient(Origin,
ERR_INVALIDMODEPARAM_MSG,
Client_ID(Origin),
Channel_Name(Channel), 'k');
goto chan_exit;
}
if (is_oper || is_machine || is_owner ||
is_admin || is_op || is_halfop) {
Channel_ModeDel(Channel, 'k');
@ -660,15 +672,25 @@ Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
Client_ID(Origin), Req->command);
goto chan_exit;
}
l = atol(Req->argv[arg_arg]);
if (l <= 0 || l >= 0xFFFF) {
if (is_machine)
Log(LOG_ERR,
"Got MODE +l with invalid limit for \"%s\" from \"%s\"! Ignored.",
Channel_Name(Channel), Client_ID(Origin));
else
connected = IRC_WriteErrClient(Origin,
ERR_INVALIDMODEPARAM_MSG,
Client_ID(Origin),
Channel_Name(Channel), 'l');
goto chan_exit;
}
if (is_oper || is_machine || is_owner ||
is_admin || is_op || is_halfop) {
l = atol(Req->argv[arg_arg]);
if (l > 0 && l < 0xFFFF) {
Channel_ModeDel(Channel, 'l');
Channel_SetMaxUsers(Channel, l);
snprintf(argadd, sizeof(argadd), "%ld", l);
x[0] = *mode_ptr;
}
Channel_ModeDel(Channel, 'l');
Channel_SetMaxUsers(Channel, l);
snprintf(argadd, sizeof(argadd), "%ld", l);
x[0] = *mode_ptr;
} else {
connected = IRC_WriteErrClient(Origin,
ERR_CHANOPRIVSNEEDED_MSG,

4
src/ngircd/messages.h
View File

@ -1,6 +1,6 @@
/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2020 Alexander Barton (alex@barton.de) and Contributors.
* Copyright (c)2001-2023 Alexander Barton (alex@barton.de) and Contributors.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -162,6 +162,8 @@
#define ERR_USERNOTONSERV_MSG "504 %s %s :User is not on this server"
#define ERR_NOINVITE_MSG "518 %s :Cannot invite to %s (+V)"
#define ERR_INVALIDMODEPARAM_MSG "696 %s %s %c * :Invalid mode parameter"
#ifdef ZLIB
# define RPL_STATSLINKINFOZIP_MSG "211 %s %s %d %ld %ld/%ld %ld %ld/%ld :%ld"
#endif