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authorBen Lindstrom <mouring@eviladmin.org>2001-04-08 18:26:59 +0000
committerBen Lindstrom <mouring@eviladmin.org>2001-04-08 18:26:59 +0000
commit3fcf1a22b52ed8e66d2cf548d5d4528f67377af9 (patch)
treeb635cae14328f373bb682395ab066ee819dd77c4
parentd344763643339b5ddc075cf7b8c8fb4404dc0aa0 (diff)
- markus@cvs.openbsd.org 2001/04/06 21:00:17
[auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth2.c channels.c session.c ssh.c sshconnect.c sshconnect.h uidswap.c uidswap.h] do gid/groups-swap in addition to uid-swap, should help if /home/group is chmod 750 + chgrp grp /home/group/, work be deraadt and me, thanks to olar@openwall.com is comments. we had many requests for this.
-rw-r--r--ChangeLog8
-rw-r--r--auth-rh-rsa.c4
-rw-r--r--auth-rhosts.c6
-rw-r--r--auth-rsa.c4
-rw-r--r--auth2.c4
-rw-r--r--channels.c4
-rw-r--r--session.c8
-rw-r--r--ssh.c33
-rw-r--r--sshconnect.c25
-rw-r--r--sshconnect.h6
-rw-r--r--uidswap.c101
-rw-r--r--uidswap.h6
12 files changed, 118 insertions, 91 deletions
diff --git a/ChangeLog b/ChangeLog
index 64b4678c..943f146b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,12 @@
- markus@cvs.openbsd.org 2001/04/08 11:27:33
[clientloop.c]
leave_raw_mode if ssh2 "session" is closed
+ - markus@cvs.openbsd.org 2001/04/06 21:00:17
+ [auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth2.c channels.c session.c
+ ssh.c sshconnect.c sshconnect.h uidswap.c uidswap.h]
+ do gid/groups-swap in addition to uid-swap, should help if /home/group
+ is chmod 750 + chgrp grp /home/group/, work be deraadt and me, thanks
+ to olar@openwall.com is comments. we had many requests for this.
20010408
- OpenBSD CVS Sync
@@ -4949,4 +4955,4 @@
- Wrote replacements for strlcpy and mkdtemp
- Released 1.0pre1
-$Id: ChangeLog,v 1.1082 2001/04/08 18:07:22 mouring Exp $
+$Id: ChangeLog,v 1.1083 2001/04/08 18:26:59 mouring Exp $
diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c
index 0edbdb5f..506a5a23 100644
--- a/auth-rh-rsa.c
+++ b/auth-rh-rsa.c
@@ -13,7 +13,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: auth-rh-rsa.c,v 1.22 2001/02/03 10:08:36 markus Exp $");
+RCSID("$OpenBSD: auth-rh-rsa.c,v 1.23 2001/04/06 21:00:04 markus Exp $");
#include "packet.h"
#include "xmalloc.h"
@@ -80,7 +80,7 @@ auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key
pw->pw_name, user_hostfile);
} else {
/* XXX race between stat and the following open() */
- temporarily_use_uid(pw->pw_uid);
+ temporarily_use_uid(pw);
host_status = check_host_in_hostfile(user_hostfile, canonical_hostname,
client_key, found, NULL);
restore_uid();
diff --git a/auth-rhosts.c b/auth-rhosts.c
index 9b018c9d..c71e9b55 100644
--- a/auth-rhosts.c
+++ b/auth-rhosts.c
@@ -14,7 +14,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: auth-rhosts.c,v 1.21 2001/02/08 19:30:51 itojun Exp $");
+RCSID("$OpenBSD: auth-rhosts.c,v 1.22 2001/04/06 21:00:06 markus Exp $");
#include "packet.h"
#include "xmalloc.h"
@@ -161,7 +161,7 @@ auth_rhosts(struct passwd *pw, const char *client_user)
if (pw == NULL)
return 0;
/* Switch to the user's uid. */
- temporarily_use_uid(pw->pw_uid);
+ temporarily_use_uid(pw);
/*
* Quick check: if the user has no .shosts or .rhosts files, return
* failure immediately without doing costly lookups from name
@@ -223,7 +223,7 @@ auth_rhosts(struct passwd *pw, const char *client_user)
return 0;
}
/* Temporarily use the user's uid. */
- temporarily_use_uid(pw->pw_uid);
+ temporarily_use_uid(pw);
/* Check all .rhosts files (currently .shosts and .rhosts). */
for (rhosts_file_index = 0; rhosts_files[rhosts_file_index];
diff --git a/auth-rsa.c b/auth-rsa.c
index 30e5a54c..59bee18b 100644
--- a/auth-rsa.c
+++ b/auth-rsa.c
@@ -14,7 +14,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: auth-rsa.c,v 1.39 2001/03/01 02:45:10 deraadt Exp $");
+RCSID("$OpenBSD: auth-rsa.c,v 1.40 2001/04/06 21:00:07 markus Exp $");
#include <openssl/rsa.h>
#include <openssl/md5.h>
@@ -135,7 +135,7 @@ auth_rsa(struct passwd *pw, BIGNUM *client_n)
return 0;
/* Temporarily use the user's uid. */
- temporarily_use_uid(pw->pw_uid);
+ temporarily_use_uid(pw);
/* The authorized keys. */
snprintf(file, sizeof file, "%.500s/%.100s", pw->pw_dir,
diff --git a/auth2.c b/auth2.c
index 8c9eb17a..d676270b 100644
--- a/auth2.c
+++ b/auth2.c
@@ -23,7 +23,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: auth2.c,v 1.50 2001/04/04 20:32:56 markus Exp $");
+RCSID("$OpenBSD: auth2.c,v 1.51 2001/04/06 21:00:08 markus Exp $");
#include <openssl/evp.h>
@@ -590,7 +590,7 @@ user_key_allowed(struct passwd *pw, Key *key)
return 0;
/* Temporarily use the user's uid. */
- temporarily_use_uid(pw->pw_uid);
+ temporarily_use_uid(pw);
/* The authorized keys. */
snprintf(file, sizeof file, "%.500s/%.100s", pw->pw_dir,
diff --git a/channels.c b/channels.c
index 6ca31b84..d5526fb8 100644
--- a/channels.c
+++ b/channels.c
@@ -40,7 +40,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: channels.c,v 1.101 2001/04/05 10:42:48 markus Exp $");
+RCSID("$OpenBSD: channels.c,v 1.102 2001/04/06 21:00:10 markus Exp $");
#include <openssl/rsa.h>
#include <openssl/dsa.h>
@@ -2410,7 +2410,7 @@ auth_input_request_forwarding(struct passwd * pw)
fatal("Protocol error: authentication forwarding requested twice.");
/* Temporarily drop privileged uid for mkdir/bind. */
- temporarily_use_uid(pw->pw_uid);
+ temporarily_use_uid(pw);
/* Allocate a buffer for the socket name, and format the name. */
channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
diff --git a/session.c b/session.c
index 5264ac18..8da79933 100644
--- a/session.c
+++ b/session.c
@@ -33,7 +33,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.70 2001/04/05 15:48:18 stevesk Exp $");
+RCSID("$OpenBSD: session.c,v 1.71 2001/04/06 21:00:12 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
@@ -365,7 +365,7 @@ do_authenticated1(Authctxt *authctxt)
/* Setup to always have a local .Xauthority. */
xauthfile = xmalloc(MAXPATHLEN);
strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
- temporarily_use_uid(s->pw->pw_uid);
+ temporarily_use_uid(s->pw);
if (mkdtemp(xauthfile) == NULL) {
restore_uid();
error("private X11 dir: mkdtemp %s failed: %s",
@@ -1152,7 +1152,7 @@ do_child(Session *s, const char *command)
#endif
/* Permanently switch to the desired uid. */
- permanently_set_uid(pw->pw_uid);
+ permanently_set_uid(pw);
# endif /* HAVE_LOGIN_CAP */
}
#endif /* HAVE_OSF_SIA */
@@ -1710,7 +1710,7 @@ session_x11_req(Session *s)
}
xauthfile = xmalloc(MAXPATHLEN);
strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
- temporarily_use_uid(s->pw->pw_uid);
+ temporarily_use_uid(s->pw);
if (mkdtemp(xauthfile) == NULL) {
restore_uid();
error("private X11 dir: mkdtemp %s failed: %s",
diff --git a/ssh.c b/ssh.c
index 278e7eda..294bcf39 100644
--- a/ssh.c
+++ b/ssh.c
@@ -39,7 +39,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: ssh.c,v 1.106 2001/04/05 21:05:24 markus Exp $");
+RCSID("$OpenBSD: ssh.c,v 1.107 2001/04/06 21:00:13 markus Exp $");
#include <openssl/evp.h>
#include <openssl/err.h>
@@ -265,6 +265,15 @@ main(int ac, char **av)
fatal("setrlimit failed: %.100s", strerror(errno));
}
#endif
+ /* Get user data. */
+ pw = getpwuid(original_real_uid);
+ if (!pw) {
+ log("You don't exist, go away!");
+ exit(1);
+ }
+ /* Take a copy of the returned structure. */
+ pw = pwcopy(pw);
+
/*
* Use uid-swapping to give up root privileges for the duration of
* option processing. We will re-instantiate the rights when we are
@@ -272,7 +281,7 @@ main(int ac, char **av)
* them when the port has been created (actually, when the connection
* has been made, as we may need to create the port several times).
*/
- temporarily_use_uid(original_real_uid);
+ temporarily_use_uid(pw);
/*
* Set our umask to something reasonable, as some files are created
@@ -545,15 +554,6 @@ main(int ac, char **av)
tty_flag = 0;
}
- /* Get user data. */
- pw = getpwuid(original_real_uid);
- if (!pw) {
- log("You don't exist, go away!");
- exit(1);
- }
- /* Take a copy of the returned structure. */
- pw = pwcopy(pw);
-
/*
* Initialize "log" output. Since we are the client all output
* actually goes to stderr.
@@ -592,6 +592,7 @@ main(int ac, char **av)
"originating port will not be trusted.");
options.rhosts_authentication = 0;
}
+
/*
* If using rsh has been selected, exec it now (without trying
* anything else). Note that we must release privileges first.
@@ -604,7 +605,7 @@ main(int ac, char **av)
restore_uid();
/* Switch to the original uid permanently. */
- permanently_set_uid(original_real_uid);
+ permanently_set_uid(pw);
/* Execute rsh. */
rsh_connect(host, options.user, &command);
@@ -618,8 +619,7 @@ main(int ac, char **av)
ok = ssh_connect(host, &hostaddr, options.port,
options.connection_attempts,
original_effective_uid != 0 || !options.use_privileged_port,
- original_real_uid,
- options.proxy_command);
+ pw, options.proxy_command);
/*
* If we successfully made the connection, load the host private key
@@ -646,7 +646,7 @@ main(int ac, char **av)
* process, read the private hostkey and impersonate the host.
* OpenBSD does not allow ptracing of setuid processes.
*/
- permanently_set_uid(original_real_uid);
+ permanently_set_uid(pw);
/*
* Now that we are back to our own permissions, create ~/.ssh
@@ -688,8 +688,7 @@ main(int ac, char **av)
tilde_expand_filename(options.user_hostfile2, original_real_uid);
/* Log into the remote system. This never returns if the login fails. */
- ssh_login(host_private_key, host, (struct sockaddr *)&hostaddr,
- original_real_uid);
+ ssh_login(host_private_key, host, (struct sockaddr *)&hostaddr, pw);
/* We no longer need the host private key. Clear it now. */
if (host_private_key != NULL)
diff --git a/sshconnect.c b/sshconnect.c
index 754ac124..85427b44 100644
--- a/sshconnect.c
+++ b/sshconnect.c
@@ -13,7 +13,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect.c,v 1.102 2001/04/05 10:42:55 markus Exp $");
+RCSID("$OpenBSD: sshconnect.c,v 1.103 2001/04/06 21:00:14 markus Exp $");
#include <openssl/bn.h>
@@ -45,7 +45,7 @@ extern int IPv4or6;
* Connect to the given ssh server using a proxy command.
*/
int
-ssh_proxy_connect(const char *host, u_short port, uid_t original_real_uid,
+ssh_proxy_connect(const char *host, u_short port, struct passwd *pw,
const char *proxy_command)
{
Buffer command;
@@ -96,7 +96,7 @@ ssh_proxy_connect(const char *host, u_short port, uid_t original_real_uid,
char *argv[10];
/* Child. Permanently give up superuser privileges. */
- permanently_set_uid(original_real_uid);
+ permanently_set_uid(pw);
/* Redirect stdin and stdout. */
close(pin[1]);
@@ -145,7 +145,7 @@ ssh_proxy_connect(const char *host, u_short port, uid_t original_real_uid,
* Creates a (possibly privileged) socket for use as the ssh connection.
*/
int
-ssh_create_socket(uid_t original_real_uid, int privileged, int family)
+ssh_create_socket(struct passwd *pw, int privileged, int family)
{
int sock;
@@ -165,7 +165,7 @@ ssh_create_socket(uid_t original_real_uid, int privileged, int family)
* Just create an ordinary socket on arbitrary port. We use
* the user's uid to create the socket.
*/
- temporarily_use_uid(original_real_uid);
+ temporarily_use_uid(pw);
sock = socket(family, SOCK_STREAM, 0);
if (sock < 0)
error("socket: %.100s", strerror(errno));
@@ -188,7 +188,7 @@ ssh_create_socket(uid_t original_real_uid, int privileged, int family)
int
ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
u_short port, int connection_attempts,
- int anonymous, uid_t original_real_uid,
+ int anonymous, struct passwd *pw,
const char *proxy_command)
{
int gaierr;
@@ -212,7 +212,7 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
}
/* If a proxy command is given, connect using it. */
if (proxy_command != NULL)
- return ssh_proxy_connect(host, port, original_real_uid, proxy_command);
+ return ssh_proxy_connect(host, port, pw, proxy_command);
/* No proxy command. */
@@ -248,7 +248,7 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
host, ntop, strport);
/* Create a socket for connecting. */
- sock = ssh_create_socket(original_real_uid,
+ sock = ssh_create_socket(pw,
#ifdef HAVE_CYGWIN
!anonymous,
#else
@@ -262,7 +262,7 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
* hope that it will help with tcp_wrappers showing
* the remote uid as root.
*/
- temporarily_use_uid(original_real_uid);
+ temporarily_use_uid(pw);
if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) {
/* Successful connection. */
memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
@@ -739,16 +739,11 @@ check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key,
*/
void
ssh_login(Key *own_host_key, const char *orighost,
- struct sockaddr *hostaddr, uid_t original_real_uid)
+ struct sockaddr *hostaddr, struct passwd *pw)
{
- struct passwd *pw;
char *host, *cp;
char *server_user, *local_user;
- /* Get local user name. Use it as server user if no user name was given. */
- pw = getpwuid(original_real_uid);
- if (!pw)
- fatal("User id %u not found from user database.", original_real_uid);
local_user = xstrdup(pw->pw_name);
server_user = options.user ? options.user : local_user;
diff --git a/sshconnect.h b/sshconnect.h
index 3a71d9c2..45caf739 100644
--- a/sshconnect.h
+++ b/sshconnect.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshconnect.h,v 1.7 2001/03/26 08:07:09 markus Exp $ */
+/* $OpenBSD: sshconnect.h,v 1.8 2001/04/06 21:00:15 markus Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
@@ -37,7 +37,7 @@
int
ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
u_short port, int connection_attempts,
- int anonymous, uid_t original_real_uid,
+ int anonymous, struct passwd *pw,
const char *proxy_command);
/*
@@ -51,7 +51,7 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
void
ssh_login(Key *host_key, const char *host,
- struct sockaddr * hostaddr, uid_t original_real_uid);
+ struct sockaddr * hostaddr, struct passwd *pw);
void
diff --git a/uidswap.c b/uidswap.c
index bdfa484f..7cfacd4a 100644
--- a/uidswap.c
+++ b/uidswap.c
@@ -12,7 +12,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: uidswap.c,v 1.13 2001/01/21 19:06:01 markus Exp $");
+RCSID("$OpenBSD: uidswap.c,v 1.14 2001/04/06 21:00:16 markus Exp $");
#include "log.h"
#include "uidswap.h"
@@ -26,57 +26,80 @@ RCSID("$OpenBSD: uidswap.c,v 1.13 2001/01/21 19:06:01 markus Exp $");
* POSIX saved uids or not.
*/
-#if defined(_POSIX_SAVED_IDS) && !defined(BROKEN_SAVED_UIDS)
/* Lets assume that posix saved ids also work with seteuid, even though that
is not part of the posix specification. */
-#define SAVED_IDS_WORK_WITH_SETEUID
+
/* Saved effective uid. */
-static uid_t saved_euid = 0;
-#endif
-
+static int privileged = 0;
+static int temporarily_use_uid_effective = 0;
+static uid_t saved_euid = 0;
+static gid_t saved_egid;
+static gid_t saved_egroups[NGROUPS_MAX], user_groups[NGROUPS_MAX];
+static int saved_egroupslen = -1, user_groupslen = -1;
+
/*
* Temporarily changes to the given uid. If the effective user
* id is not root, this does nothing. This call cannot be nested.
*/
void
-temporarily_use_uid(uid_t uid)
+temporarily_use_uid(struct passwd *pw)
{
-#ifdef SAVED_IDS_WORK_WITH_SETEUID
- /* Save the current euid. */
- saved_euid = geteuid();
-
- /* Set the effective uid to the given (unprivileged) uid. */
- if (seteuid(uid) == -1)
- debug("seteuid %u: %.100s", (u_int) uid, strerror(errno));
-#else /* SAVED_IDS_WORK_WITH_SETEUID */
- /* Propagate the privileged uid to all of our uids. */
- if (setuid(geteuid()) < 0)
- debug("setuid %u: %.100s", (u_int) geteuid(), strerror(errno));
-
- /* Set the effective uid to the given (unprivileged) uid. */
- if (seteuid(uid) == -1)
- debug("seteuid %u: %.100s", (u_int) uid, strerror(errno));
-#endif /* SAVED_IDS_WORK_WITH_SETEUID */
+ /* Save the current euid, and egroups. */
+ saved_euid = geteuid();
+ debug("temporarily_use_uid: %d/%d (e=%d)",
+ pw->pw_uid, pw->pw_gid, saved_euid);
+ if (saved_euid != 0) {
+ privileged = 0;
+ return;
+ }
+ privileged = 1;
+ temporarily_use_uid_effective = 1;
+ saved_egid = getegid();
+ saved_egroupslen = getgroups(NGROUPS_MAX, saved_egroups);
+ if (saved_egroupslen < 0)
+ fatal("getgroups: %.100s", strerror(errno));
+
+ /* set and save the user's groups */
+ if (user_groupslen == -1) {
+ if (initgroups(pw->pw_name, pw->pw_gid) < 0)
+ fatal("initgroups: %s: %.100s", pw->pw_name,
+ strerror(errno));
+ user_groupslen = getgroups(NGROUPS_MAX, user_groups);
+ if (user_groupslen < 0)
+ fatal("getgroups: %.100s", strerror(errno));
+ }
+ /* Set the effective uid to the given (unprivileged) uid. */
+ if (setgroups(user_groupslen, user_groups) < 0)
+ fatal("setgroups: %.100s", strerror(errno));
+ pw->pw_gid = pw->pw_gid;
+ if (setegid(pw->pw_gid) < 0)
+ fatal("setegid %u: %.100s", (u_int) pw->pw_gid,
+ strerror(errno));
+ if (seteuid(pw->pw_uid) == -1)
+ fatal("seteuid %u: %.100s", (u_int) pw->pw_uid,
+ strerror(errno));
}
-
+
/*
* Restores to the original uid.
*/
void
restore_uid(void)
{
-#ifdef SAVED_IDS_WORK_WITH_SETEUID
+ debug("restore_uid");
+ /* it's a no-op unless privileged */
+ if (!privileged)
+ return;
+ if (!temporarily_use_uid_effective)
+ fatal("restore_uid: temporarily_use_uid not effective");
/* Set the effective uid back to the saved uid. */
if (seteuid(saved_euid) < 0)
- debug("seteuid %u: %.100s", (u_int) saved_euid, strerror(errno));
-#else /* SAVED_IDS_WORK_WITH_SETEUID */
- /*
- * We are unable to restore the real uid to its unprivileged value.
- * Propagate the real uid (usually more privileged) to effective uid
- * as well.
- */
- setuid(getuid());
-#endif /* SAVED_IDS_WORK_WITH_SETEUID */
+ fatal("seteuid %u: %.100s", (u_int) saved_euid, strerror(errno));
+ if (setgroups(saved_egroupslen, saved_egroups) < 0)
+ fatal("setgroups: %.100s", strerror(errno));
+ if (setegid(saved_egid) < 0)
+ fatal("setegid %u: %.100s", (u_int) saved_egid, strerror(errno));
+ temporarily_use_uid_effective = 0;
}
/*
@@ -84,8 +107,12 @@ restore_uid(void)
* called while temporarily_use_uid is effective.
*/
void
-permanently_set_uid(uid_t uid)
+permanently_set_uid(struct passwd *pw)
{
- if (setuid(uid) < 0)
- debug("setuid %u: %.100s", (u_int) uid, strerror(errno));
+ if (temporarily_use_uid_effective)
+ fatal("restore_uid: temporarily_use_uid effective");
+ if (setuid(pw->pw_uid) < 0)
+ fatal("setuid %u: %.100s", (u_int) pw->pw_uid, strerror(errno));
+ if (setgid(pw->pw_gid) < 0)
+ fatal("setgid %u: %.100s", (u_int) pw->pw_gid, strerror(errno));
}
diff --git a/uidswap.h b/uidswap.h
index ab1a79c8..228e5a5e 100644
--- a/uidswap.h
+++ b/uidswap.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: uidswap.h,v 1.6 2001/01/29 01:58:19 niklas Exp $ */
+/* $OpenBSD: uidswap.h,v 1.7 2001/04/06 21:00:17 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -19,7 +19,7 @@
* Temporarily changes to the given uid. If the effective user id is not
* root, this does nothing. This call cannot be nested.
*/
-void temporarily_use_uid(uid_t uid);
+void temporarily_use_uid(struct passwd *pw);
/*
* Restores the original effective user id after temporarily_use_uid().
@@ -31,6 +31,6 @@ void restore_uid(void);
* Permanently sets all uids to the given uid. This cannot be called while
* temporarily_use_uid is effective. This must also clear any saved uids.
*/
-void permanently_set_uid(uid_t uid);
+void permanently_set_uid(struct passwd *pw);
#endif /* UIDSWAP_H */