mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-23 18:32:26 +00:00
57c30117c1
[atomicio.c auth-bsdauth.c auth-chall.c auth-options.c auth-passwd.c]
[auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth-skey.c auth.c auth1.c]
[auth2-chall.c auth2-hostbased.c auth2-kbdint.c auth2-none.c]
[auth2-passwd.c auth2-pubkey.c auth2.c authfd.c authfile.c bufaux.c]
[buffer.c canohost.c channels.c cipher-3des1.c cipher-bf1.c]
[cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c compress.c]
[deattack.c dh.c dispatch.c fatal.c groupaccess.c hostfile.c kex.c]
[kexdh.c kexdhc.c kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c log.c]
[mac.c match.c md-sha256.c misc.c monitor.c monitor_fdpass.c]
[monitor_mm.c monitor_wrap.c msg.c nchan.c packet.c progressmeter.c]
[readconf.c readpass.c rsa.c scard.c scp.c servconf.c serverloop.c]
[session.c sftp-client.c sftp-common.c sftp-glob.c sftp-server.c]
[sftp.c ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c]
[ssh-keysign.c ssh-rsa.c ssh.c sshconnect.c sshconnect1.c]
[sshconnect2.c sshd.c sshlogin.c sshpty.c sshtty.c ttymodes.c]
[uidswap.c uuencode.c xmalloc.c]
Put $OpenBSD$ tags back (as comments) to replace the RCSID()s that
Theo nuked - our scripts to sync -portable need them in the files
344 lines
8.4 KiB
C
344 lines
8.4 KiB
C
/* $OpenBSD: auth-options.c,v 1.35 2006/03/25 13:17:01 djm Exp $ */
|
|
/*
|
|
* Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
* All rights reserved
|
|
* As far as I am concerned, the code I have written for this software
|
|
* can be used freely for any purpose. Any derived versions of this
|
|
* software must be clearly marked as such, and if the derived work is
|
|
* incompatible with the protocol description in the RFC file, it must be
|
|
* called by a name other than "ssh" or "Secure Shell".
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include "xmalloc.h"
|
|
#include "match.h"
|
|
#include "log.h"
|
|
#include "canohost.h"
|
|
#include "channels.h"
|
|
#include "auth-options.h"
|
|
#include "servconf.h"
|
|
#include "misc.h"
|
|
#include "monitor_wrap.h"
|
|
#include "auth.h"
|
|
|
|
/* Flags set authorized_keys flags */
|
|
int no_port_forwarding_flag = 0;
|
|
int no_agent_forwarding_flag = 0;
|
|
int no_x11_forwarding_flag = 0;
|
|
int no_pty_flag = 0;
|
|
|
|
/* "command=" option. */
|
|
char *forced_command = NULL;
|
|
|
|
/* "environment=" options. */
|
|
struct envstring *custom_environment = NULL;
|
|
|
|
/* "tunnel=" option. */
|
|
int forced_tun_device = -1;
|
|
|
|
extern ServerOptions options;
|
|
|
|
void
|
|
auth_clear_options(void)
|
|
{
|
|
no_agent_forwarding_flag = 0;
|
|
no_port_forwarding_flag = 0;
|
|
no_pty_flag = 0;
|
|
no_x11_forwarding_flag = 0;
|
|
while (custom_environment) {
|
|
struct envstring *ce = custom_environment;
|
|
custom_environment = ce->next;
|
|
xfree(ce->s);
|
|
xfree(ce);
|
|
}
|
|
if (forced_command) {
|
|
xfree(forced_command);
|
|
forced_command = NULL;
|
|
}
|
|
forced_tun_device = -1;
|
|
channel_clear_permitted_opens();
|
|
auth_debug_reset();
|
|
}
|
|
|
|
/*
|
|
* return 1 if access is granted, 0 if not.
|
|
* side effect: sets key option flags
|
|
*/
|
|
int
|
|
auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
|
|
{
|
|
const char *cp;
|
|
int i;
|
|
|
|
/* reset options */
|
|
auth_clear_options();
|
|
|
|
if (!opts)
|
|
return 1;
|
|
|
|
while (*opts && *opts != ' ' && *opts != '\t') {
|
|
cp = "no-port-forwarding";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
auth_debug_add("Port forwarding disabled.");
|
|
no_port_forwarding_flag = 1;
|
|
opts += strlen(cp);
|
|
goto next_option;
|
|
}
|
|
cp = "no-agent-forwarding";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
auth_debug_add("Agent forwarding disabled.");
|
|
no_agent_forwarding_flag = 1;
|
|
opts += strlen(cp);
|
|
goto next_option;
|
|
}
|
|
cp = "no-X11-forwarding";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
auth_debug_add("X11 forwarding disabled.");
|
|
no_x11_forwarding_flag = 1;
|
|
opts += strlen(cp);
|
|
goto next_option;
|
|
}
|
|
cp = "no-pty";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
auth_debug_add("Pty allocation disabled.");
|
|
no_pty_flag = 1;
|
|
opts += strlen(cp);
|
|
goto next_option;
|
|
}
|
|
cp = "command=\"";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
opts += strlen(cp);
|
|
forced_command = xmalloc(strlen(opts) + 1);
|
|
i = 0;
|
|
while (*opts) {
|
|
if (*opts == '"')
|
|
break;
|
|
if (*opts == '\\' && opts[1] == '"') {
|
|
opts += 2;
|
|
forced_command[i++] = '"';
|
|
continue;
|
|
}
|
|
forced_command[i++] = *opts++;
|
|
}
|
|
if (!*opts) {
|
|
debug("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
auth_debug_add("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
xfree(forced_command);
|
|
forced_command = NULL;
|
|
goto bad_option;
|
|
}
|
|
forced_command[i] = 0;
|
|
auth_debug_add("Forced command: %.900s", forced_command);
|
|
opts++;
|
|
goto next_option;
|
|
}
|
|
cp = "environment=\"";
|
|
if (options.permit_user_env &&
|
|
strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
char *s;
|
|
struct envstring *new_envstring;
|
|
|
|
opts += strlen(cp);
|
|
s = xmalloc(strlen(opts) + 1);
|
|
i = 0;
|
|
while (*opts) {
|
|
if (*opts == '"')
|
|
break;
|
|
if (*opts == '\\' && opts[1] == '"') {
|
|
opts += 2;
|
|
s[i++] = '"';
|
|
continue;
|
|
}
|
|
s[i++] = *opts++;
|
|
}
|
|
if (!*opts) {
|
|
debug("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
auth_debug_add("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
xfree(s);
|
|
goto bad_option;
|
|
}
|
|
s[i] = 0;
|
|
auth_debug_add("Adding to environment: %.900s", s);
|
|
debug("Adding to environment: %.900s", s);
|
|
opts++;
|
|
new_envstring = xmalloc(sizeof(struct envstring));
|
|
new_envstring->s = s;
|
|
new_envstring->next = custom_environment;
|
|
custom_environment = new_envstring;
|
|
goto next_option;
|
|
}
|
|
cp = "from=\"";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
const char *remote_ip = get_remote_ipaddr();
|
|
const char *remote_host = get_canonical_hostname(
|
|
options.use_dns);
|
|
char *patterns = xmalloc(strlen(opts) + 1);
|
|
|
|
opts += strlen(cp);
|
|
i = 0;
|
|
while (*opts) {
|
|
if (*opts == '"')
|
|
break;
|
|
if (*opts == '\\' && opts[1] == '"') {
|
|
opts += 2;
|
|
patterns[i++] = '"';
|
|
continue;
|
|
}
|
|
patterns[i++] = *opts++;
|
|
}
|
|
if (!*opts) {
|
|
debug("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
auth_debug_add("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
xfree(patterns);
|
|
goto bad_option;
|
|
}
|
|
patterns[i] = 0;
|
|
opts++;
|
|
if (match_host_and_ip(remote_host, remote_ip,
|
|
patterns) != 1) {
|
|
xfree(patterns);
|
|
logit("Authentication tried for %.100s with "
|
|
"correct key but not from a permitted "
|
|
"host (host=%.200s, ip=%.200s).",
|
|
pw->pw_name, remote_host, remote_ip);
|
|
auth_debug_add("Your host '%.200s' is not "
|
|
"permitted to use this key for login.",
|
|
remote_host);
|
|
/* deny access */
|
|
return 0;
|
|
}
|
|
xfree(patterns);
|
|
/* Host name matches. */
|
|
goto next_option;
|
|
}
|
|
cp = "permitopen=\"";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
char *host, *p;
|
|
u_short port;
|
|
char *patterns = xmalloc(strlen(opts) + 1);
|
|
|
|
opts += strlen(cp);
|
|
i = 0;
|
|
while (*opts) {
|
|
if (*opts == '"')
|
|
break;
|
|
if (*opts == '\\' && opts[1] == '"') {
|
|
opts += 2;
|
|
patterns[i++] = '"';
|
|
continue;
|
|
}
|
|
patterns[i++] = *opts++;
|
|
}
|
|
if (!*opts) {
|
|
debug("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
auth_debug_add("%.100s, line %lu: missing "
|
|
"end quote", file, linenum);
|
|
xfree(patterns);
|
|
goto bad_option;
|
|
}
|
|
patterns[i] = 0;
|
|
opts++;
|
|
p = patterns;
|
|
host = hpdelim(&p);
|
|
if (host == NULL || strlen(host) >= NI_MAXHOST) {
|
|
debug("%.100s, line %lu: Bad permitopen "
|
|
"specification <%.100s>", file, linenum,
|
|
patterns);
|
|
auth_debug_add("%.100s, line %lu: "
|
|
"Bad permitopen specification", file,
|
|
linenum);
|
|
xfree(patterns);
|
|
goto bad_option;
|
|
}
|
|
host = cleanhostname(host);
|
|
if (p == NULL || (port = a2port(p)) == 0) {
|
|
debug("%.100s, line %lu: Bad permitopen port "
|
|
"<%.100s>", file, linenum, p ? p : "");
|
|
auth_debug_add("%.100s, line %lu: "
|
|
"Bad permitopen port", file, linenum);
|
|
xfree(patterns);
|
|
goto bad_option;
|
|
}
|
|
if (options.allow_tcp_forwarding)
|
|
channel_add_permitted_opens(host, port);
|
|
xfree(patterns);
|
|
goto next_option;
|
|
}
|
|
cp = "tunnel=\"";
|
|
if (strncasecmp(opts, cp, strlen(cp)) == 0) {
|
|
char *tun = NULL;
|
|
opts += strlen(cp);
|
|
tun = xmalloc(strlen(opts) + 1);
|
|
i = 0;
|
|
while (*opts) {
|
|
if (*opts == '"')
|
|
break;
|
|
tun[i++] = *opts++;
|
|
}
|
|
if (!*opts) {
|
|
debug("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
auth_debug_add("%.100s, line %lu: missing end quote",
|
|
file, linenum);
|
|
xfree(tun);
|
|
forced_tun_device = -1;
|
|
goto bad_option;
|
|
}
|
|
tun[i] = 0;
|
|
forced_tun_device = a2tun(tun, NULL);
|
|
xfree(tun);
|
|
if (forced_tun_device == SSH_TUNID_ERR) {
|
|
debug("%.100s, line %lu: invalid tun device",
|
|
file, linenum);
|
|
auth_debug_add("%.100s, line %lu: invalid tun device",
|
|
file, linenum);
|
|
forced_tun_device = -1;
|
|
goto bad_option;
|
|
}
|
|
auth_debug_add("Forced tun device: %d", forced_tun_device);
|
|
opts++;
|
|
goto next_option;
|
|
}
|
|
next_option:
|
|
/*
|
|
* Skip the comma, and move to the next option
|
|
* (or break out if there are no more).
|
|
*/
|
|
if (!*opts)
|
|
fatal("Bugs in auth-options.c option processing.");
|
|
if (*opts == ' ' || *opts == '\t')
|
|
break; /* End of options. */
|
|
if (*opts != ',')
|
|
goto bad_option;
|
|
opts++;
|
|
/* Process the next option. */
|
|
}
|
|
|
|
if (!use_privsep)
|
|
auth_debug_send();
|
|
|
|
/* grant access */
|
|
return 1;
|
|
|
|
bad_option:
|
|
logit("Bad options in %.100s file, line %lu: %.50s",
|
|
file, linenum, opts);
|
|
auth_debug_add("Bad options in %.100s file, line %lu: %.50s",
|
|
file, linenum, opts);
|
|
|
|
if (!use_privsep)
|
|
auth_debug_send();
|
|
|
|
/* deny access */
|
|
return 0;
|
|
}
|