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add gssapi forced command

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This commit is contained in:
Jan F 2011-05-22 23:49:15 +02:00
parent c2c99d4dd7
commit 5b4ccb39dd
3 changed files with 336 additions and 41 deletions
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288
openssh-5.8p2-force_krb.patch Normal file
View File

@ -0,0 +1,288 @@
diff -up openssh-5.8p2/gss-serv-krb5.c.force_krb openssh-5.8p2/gss-serv-krb5.c
--- openssh-5.8p2/gss-serv-krb5.c.force_krb 2006-09-01 07:38:36.000000000 +0200
+++ openssh-5.8p2/gss-serv-krb5.c 2011-05-19 03:41:45.801109545 +0200
@@ -32,7 +32,9 @@
#include <sys/types.h>
#include <stdarg.h>
+#include <stdio.h>
#include <string.h>
+#include <unistd.h>
#include "xmalloc.h"
#include "key.h"
@@ -40,12 +42,11 @@
#include "auth.h"
#include "log.h"
#include "servconf.h"
+#include "misc.h"
#include "buffer.h"
#include "ssh-gss.h"
-extern ServerOptions options;
-
#ifdef HEIMDAL
# include <krb5.h>
#else
@@ -56,6 +57,16 @@ extern ServerOptions options;
# endif
#endif
+extern Authctxt *the_authctxt;
+extern ServerOptions options;
+
+/* all commands are allowed by default */
+char **k5users_allowed_cmds = NULL;
+
+static int ssh_gssapi_k5login_exists();
+static int ssh_gssapi_krb5_cmdok(krb5_principal, const char *, const char *,
+ int);
+
static krb5_context krb_context = NULL;
/* Initialise the krb5 library, for the stuff that GSSAPI won't do */
@@ -83,10 +94,11 @@ ssh_gssapi_krb5_init(void)
*/
static int
-ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
+ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *luser)
{
krb5_principal princ;
int retval;
+ int k5login_exists;
if (ssh_gssapi_krb5_init() == 0)
return 0;
@@ -97,10 +109,22 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client
krb5_get_err_text(krb_context, retval));
return 0;
}
- if (krb5_kuserok(krb_context, princ, name)) {
+ /* krb5_kuserok() returns 1 if .k5login DNE and this is self-login.
+ * We have to make sure to check .k5users in that case. */
+ k5login_exists = ssh_gssapi_k5login_exists();
+ /* NOTE: .k5login and .k5users must opened as root, not the user,
+ * because if they are on a krb5-protected filesystem, user credentials
+ * to access these files aren't available yet. */
+ if (krb5_kuserok(krb_context, princ, luser) && k5login_exists) {
retval = 1;
logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
- name, (char *)client->displayname.value);
+ luser, (char *)client->displayname.value);
+ } else if (ssh_gssapi_krb5_cmdok(princ, client->exportedname.value,
+ luser, k5login_exists)) {
+ retval = 1;
+ logit("Authorized to %s, krb5 principal %s "
+ "(ssh_gssapi_krb5_cmdok)",
+ luser, (char *)client->displayname.value);
} else
retval = 0;
@@ -108,6 +132,134 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client
return retval;
}
+/* Test for existence of .k5login.
+ * We need this as part of our .k5users check, because krb5_kuserok()
+ * returns success if .k5login DNE and user is logging in as himself.
+ * With .k5login absent and .k5users present, we don't want absence
+ * of .k5login to authorize self-login. (absence of both is required)
+ * Returns 1 if .k5login is available, 0 otherwise.
+ */
+static int
+ssh_gssapi_k5login_exists()
+{
+ char file[MAXPATHLEN];
+ struct passwd *pw = the_authctxt->pw;
+
+ snprintf(file, sizeof(file), "%s/.k5login", pw->pw_dir);
+ return access(file, F_OK) == 0;
+}
+
+/* check .k5users for login or command authorization
+ * Returns 1 if principal is authorized, 0 otherwise.
+ * If principal is authorized, (global) k5users_allowed_cmds may be populated.
+ */
+static int
+ssh_gssapi_krb5_cmdok(krb5_principal principal, const char *name,
+ const char *luser, int k5login_exists)
+{
+ FILE *fp;
+ char file[MAXPATHLEN];
+ char line[BUFSIZ];
+ char kuser[65]; /* match krb5_kuserok() */
+ struct stat st;
+ struct passwd *pw = the_authctxt->pw;
+ int found_principal = 0;
+ int ncommands = 0, allcommands = 0;
+ u_long linenum;
+
+ snprintf(file, sizeof(file), "%s/.k5users", pw->pw_dir);
+ /* If both .k5login and .k5users DNE, self-login is ok. */
+ if (!k5login_exists && (access(file, F_OK) == -1)) {
+ return (krb5_aname_to_localname(krb_context, principal,
+ sizeof(kuser), kuser) == 0) &&
+ (strcmp(kuser, luser) == 0);
+ }
+ if ((fp = fopen(file, "r")) == NULL) {
+ int saved_errno = errno;
+ /* 2nd access check to ease debugging if file perms are wrong.
+ * But we don't want to report this if .k5users simply DNE. */
+ if (access(file, F_OK) == 0) {
+ logit("User %s fopen %s failed: %s",
+ pw->pw_name, file, strerror(saved_errno));
+ }
+ return 0;
+ }
+ /* .k5users must be owned either by the user or by root */
+ if (fstat(fileno(fp), &st) == -1) {
+ /* can happen, but very wierd error so report it */
+ logit("User %s fstat %s failed: %s",
+ pw->pw_name, file, strerror(errno));
+ fclose(fp);
+ return 0;
+ }
+ if (!(st.st_uid == pw->pw_uid || st.st_uid == 0)) {
+ logit("User %s %s is not owned by root or user",
+ pw->pw_name, file);
+ fclose(fp);
+ return 0;
+ }
+ /* .k5users must be a regular file. krb5_kuserok() doesn't do this
+ * check, but we don't want to be deficient if they add a check. */
+ if (!S_ISREG(st.st_mode)) {
+ logit("User %s %s is not a regular file", pw->pw_name, file);
+ fclose(fp);
+ return 0;
+ }
+ /* file exists; initialize k5users_allowed_cmds (to none!) */
+ k5users_allowed_cmds = xcalloc(++ncommands,
+ sizeof(*k5users_allowed_cmds));
+
+ /* Check each line. ksu allows unlimited length lines. We don't. */
+ while (!allcommands && read_keyfile_line(fp, file, line, sizeof(line),
+ &linenum) != -1) {
+ char *token;
+
+ /* we parse just like ksu, even though we could do better */
+ token = strtok(line, " \t\n");
+ if (strcmp(name, token) == 0) {
+ /* we matched on client principal */
+ found_principal = 1;
+ if ((token = strtok(NULL, " \t\n")) == NULL) {
+ /* only shell is allowed */
+ k5users_allowed_cmds[ncommands-1] =
+ xstrdup(pw->pw_shell);
+ k5users_allowed_cmds =
+ xrealloc(k5users_allowed_cmds, ++ncommands,
+ sizeof(*k5users_allowed_cmds));
+ break;
+ }
+ /* process the allowed commands */
+ while (token) {
+ if (strcmp(token, "*") == 0) {
+ allcommands = 1;
+ break;
+ }
+ k5users_allowed_cmds[ncommands-1] =
+ xstrdup(token);
+ k5users_allowed_cmds =
+ xrealloc(k5users_allowed_cmds, ++ncommands,
+ sizeof(*k5users_allowed_cmds));
+ token = strtok(NULL, " \t\n");
+ }
+ }
+ }
+ if (k5users_allowed_cmds) {
+ /* terminate vector */
+ k5users_allowed_cmds[ncommands-1] = NULL;
+ /* if all commands are allowed, free vector */
+ if (allcommands) {
+ int i;
+ for (i = 0; i < ncommands; i++) {
+ free(k5users_allowed_cmds[i]);
+ }
+ free(k5users_allowed_cmds);
+ k5users_allowed_cmds = NULL;
+ }
+ }
+ fclose(fp);
+ return found_principal;
+}
+
/* This writes out any forwarded credentials from the structure populated
* during userauth. Called after we have setuid to the user */
diff -up openssh-5.8p2/session.c.force_krb openssh-5.8p2/session.c
--- openssh-5.8p2/session.c.force_krb 2011-05-19 03:41:41.000000000 +0200
+++ openssh-5.8p2/session.c 2011-05-19 03:43:32.437173662 +0200
@@ -816,6 +816,29 @@ do_exec(Session *s, const char *command)
debug("Forced command (key option) '%.900s'", command);
}
+#ifdef GSSAPI
+#ifdef KRB5 /* k5users_allowed_cmds only available w/ GSSAPI+KRB5 */
+ else if (k5users_allowed_cmds) {
+ const char *match = command;
+ int allowed = 0, i = 0;
+
+ if (!match)
+ match = s->pw->pw_shell;
+ while (k5users_allowed_cmds[i]) {
+ if (strcmp(match, k5users_allowed_cmds[i++]) == 0) {
+ debug("Allowed command '%.900s'", match);
+ allowed = 1;
+ break;
+ }
+ }
+ if (!allowed) {
+ debug("command '%.900s' not allowed", match);
+ return 1;
+ }
+ }
+#endif
+#endif
+
#ifdef SSH_AUDIT_EVENTS
if (s->command != NULL || s->command_handle != -1)
fatal("do_exec: command already set");
diff -up openssh-5.8p2/sshd.8.force_krb openssh-5.8p2/sshd.8
--- openssh-5.8p2/sshd.8.force_krb 2011-05-19 03:41:30.582114401 +0200
+++ openssh-5.8p2/sshd.8 2011-05-19 03:41:46.159106308 +0200
@@ -320,6 +320,7 @@ Finally, the server and the client enter
The client tries to authenticate itself using
host-based authentication,
public key authentication,
+GSSAPI authentication,
challenge-response authentication,
or password authentication.
.Pp
@@ -788,6 +789,12 @@ This file is used in exactly the same wa
but allows host-based authentication without permitting login with
rlogin/rsh.
.Pp
+.It Pa ~/.k5login
+.It Pa ~/.k5users
+These files enforce GSSAPI/Kerberos authentication access control.
+Further details are described in
+.Xr ksu 1 .
+.Pp
.It Pa ~/.ssh/
This directory is the default location for all user-specific configuration
and authentication information.
diff -up openssh-5.8p2/ssh-gss.h.force_krb openssh-5.8p2/ssh-gss.h
--- openssh-5.8p2/ssh-gss.h.force_krb 2007-06-12 15:40:39.000000000 +0200
+++ openssh-5.8p2/ssh-gss.h 2011-05-19 03:41:46.302234118 +0200
@@ -48,6 +48,10 @@
#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
#endif /* GSS_C_NT_... */
#endif /* !HEIMDAL */
+
+/* .k5users support */
+extern char **k5users_allowed_cmds;
+
#endif /* KRB5 */
/* draft-ietf-secsh-gsskeyex-06 */

74
openssh-5.8p1-kuserok.patch → openssh-5.8p2-kuserok.patch
View File

@ -1,6 +1,6 @@
diff -up openssh-5.8p1/auth-krb5.c.kuserok openssh-5.8p1/auth-krb5.c
--- openssh-5.8p1/auth-krb5.c.kuserok 2009-12-21 00:49:22.000000000 +0100
+++ openssh-5.8p1/auth-krb5.c 2011-02-14 09:15:12.000000000 +0100
diff -up openssh-5.8p2/auth-krb5.c.kuserok openssh-5.8p2/auth-krb5.c
--- openssh-5.8p2/auth-krb5.c.kuserok 2011-05-19 16:55:57.176106243 +0200
+++ openssh-5.8p2/auth-krb5.c 2011-05-19 16:56:02.009109884 +0200
@@ -54,6 +54,20 @@
extern ServerOptions options;
@ -31,30 +31,30 @@ diff -up openssh-5.8p1/auth-krb5.c.kuserok openssh-5.8p1/auth-krb5.c
problem = -1;
goto out;
}
diff -up openssh-5.8p1/gss-serv-krb5.c.kuserok openssh-5.8p1/gss-serv-krb5.c
--- openssh-5.8p1/gss-serv-krb5.c.kuserok 2006-09-01 07:38:36.000000000 +0200
+++ openssh-5.8p1/gss-serv-krb5.c 2011-02-14 09:15:12.000000000 +0100
@@ -57,6 +57,7 @@ extern ServerOptions options;
#endif
diff -up openssh-5.8p2/gss-serv-krb5.c.kuserok openssh-5.8p2/gss-serv-krb5.c
--- openssh-5.8p2/gss-serv-krb5.c.kuserok 2011-05-19 16:56:01.000000000 +0200
+++ openssh-5.8p2/gss-serv-krb5.c 2011-05-20 05:48:50.681167894 +0200
@@ -68,6 +68,7 @@ static int ssh_gssapi_krb5_cmdok(krb5_pr
int);
static krb5_context krb_context = NULL;
+extern int ssh_krb5_kuserok(krb5_context, krb5_principal, const char *);
/* Initialise the krb5 library, for the stuff that GSSAPI won't do */
@@ -97,7 +98,7 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client
krb5_get_err_text(krb_context, retval));
return 0;
}
- if (krb5_kuserok(krb_context, princ, name)) {
+ if (ssh_krb5_kuserok(krb_context, princ, name)) {
@@ -115,7 +116,7 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client
/* NOTE: .k5login and .k5users must opened as root, not the user,
* because if they are on a krb5-protected filesystem, user credentials
* to access these files aren't available yet. */
- if (krb5_kuserok(krb_context, princ, luser) && k5login_exists) {
+ if (ssh_krb5_kuserok(krb_context, princ, luser) && k5login_exists) {
retval = 1;
logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
name, (char *)client->displayname.value);
diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
--- openssh-5.8p1/servconf.c.kuserok 2011-02-14 09:15:12.000000000 +0100
+++ openssh-5.8p1/servconf.c 2011-02-14 09:20:22.000000000 +0100
@@ -142,6 +142,7 @@ initialize_server_options(ServerOptions
luser, (char *)client->displayname.value);
diff -up openssh-5.8p2/servconf.c.kuserok openssh-5.8p2/servconf.c
--- openssh-5.8p2/servconf.c.kuserok 2011-05-19 16:55:59.549112264 +0200
+++ openssh-5.8p2/servconf.c 2011-05-19 16:56:02.332106613 +0200
@@ -145,6 +145,7 @@ initialize_server_options(ServerOptions
options->authorized_principals_file = NULL;
options->ip_qos_interactive = -1;
options->ip_qos_bulk = -1;
@ -62,7 +62,7 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
}
void
@@ -291,6 +292,8 @@ fill_default_server_options(ServerOption
@@ -300,6 +301,8 @@ fill_default_server_options(ServerOption
if (use_privsep == -1)
use_privsep = 1;
@ -71,7 +71,7 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
#ifndef HAVE_MMAP
if (use_privsep && options->compression == 1) {
error("This platform does not support both privilege "
@@ -312,7 +315,7 @@ typedef enum {
@@ -321,7 +324,7 @@ typedef enum {
sPermitRootLogin, sLogFacility, sLogLevel,
sRhostsRSAAuthentication, sRSAAuthentication,
sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
@ -80,7 +80,7 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
sKerberosTgtPassing, sChallengeResponseAuthentication,
sPasswordAuthentication, sKbdInteractiveAuthentication,
sListenAddress, sAddressFamily,
@@ -381,11 +384,13 @@ static struct {
@@ -392,11 +395,13 @@ static struct {
#else
{ "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
#endif
@ -94,7 +94,7 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
#endif
{ "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL },
{ "afstokenpassing", sUnsupported, SSHCFG_GLOBAL },
@@ -1341,6 +1346,10 @@ process_server_config_line(ServerOptions
@@ -1374,6 +1379,10 @@ process_server_config_line(ServerOptions
*activep = value;
break;
@ -105,7 +105,7 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
case sPermitOpen:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
@@ -1544,6 +1553,7 @@ copy_set_server_options(ServerOptions *d
@@ -1577,6 +1586,7 @@ copy_set_server_options(ServerOptions *d
M_CP_INTOPT(max_authtries);
M_CP_INTOPT(ip_qos_interactive);
M_CP_INTOPT(ip_qos_bulk);
@ -113,7 +113,7 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
M_CP_STROPT(banner);
if (preauth)
@@ -1764,6 +1774,7 @@ dump_config(ServerOptions *o)
@@ -1800,6 +1810,7 @@ dump_config(ServerOptions *o)
dump_cfg_fmtint(sUseDNS, o->use_dns);
dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding);
dump_cfg_fmtint(sUsePrivilegeSeparation, use_privsep);
@ -121,10 +121,10 @@ diff -up openssh-5.8p1/servconf.c.kuserok openssh-5.8p1/servconf.c
/* string arguments */
dump_cfg_string(sPidFile, o->pid_file);
diff -up openssh-5.8p1/servconf.h.kuserok openssh-5.8p1/servconf.h
--- openssh-5.8p1/servconf.h.kuserok 2011-02-14 09:15:12.000000000 +0100
+++ openssh-5.8p1/servconf.h 2011-02-14 09:15:12.000000000 +0100
@@ -157,6 +157,7 @@ typedef struct {
diff -up openssh-5.8p2/servconf.h.kuserok openssh-5.8p2/servconf.h
--- openssh-5.8p2/servconf.h.kuserok 2011-05-19 16:55:59.676167388 +0200
+++ openssh-5.8p2/servconf.h 2011-05-19 16:56:02.449168732 +0200
@@ -160,6 +160,7 @@ typedef struct {
int num_permitted_opens;
@ -132,10 +132,10 @@ diff -up openssh-5.8p1/servconf.h.kuserok openssh-5.8p1/servconf.h
char *chroot_directory;
char *revoked_keys_file;
char *trusted_user_ca_keys;
diff -up openssh-5.8p1/sshd_config.5.kuserok openssh-5.8p1/sshd_config.5
--- openssh-5.8p1/sshd_config.5.kuserok 2011-02-14 09:15:12.000000000 +0100
+++ openssh-5.8p1/sshd_config.5 2011-02-14 09:17:11.000000000 +0100
@@ -574,6 +574,10 @@ Specifies whether to automatically destr
diff -up openssh-5.8p2/sshd_config.5.kuserok openssh-5.8p2/sshd_config.5
--- openssh-5.8p2/sshd_config.5.kuserok 2011-05-19 16:56:00.265169181 +0200
+++ openssh-5.8p2/sshd_config.5 2011-05-19 16:56:02.588114955 +0200
@@ -602,6 +602,10 @@ Specifies whether to automatically destr
file on logout.
The default is
.Dq yes .
@ -146,7 +146,7 @@ diff -up openssh-5.8p1/sshd_config.5.kuserok openssh-5.8p1/sshd_config.5
.It Cm KexAlgorithms
Specifies the available KEX (Key Exchange) algorithms.
Multiple algorithms must be comma-separated.
@@ -715,6 +719,7 @@ Available keywords are
@@ -743,6 +747,7 @@ Available keywords are
.Cm HostbasedUsesNameFromPacketOnly ,
.Cm KbdInteractiveAuthentication ,
.Cm KerberosAuthentication ,
@ -154,9 +154,9 @@ diff -up openssh-5.8p1/sshd_config.5.kuserok openssh-5.8p1/sshd_config.5
.Cm MaxAuthTries ,
.Cm MaxSessions ,
.Cm PubkeyAuthentication ,
diff -up openssh-5.8p1/sshd_config.kuserok openssh-5.8p1/sshd_config
--- openssh-5.8p1/sshd_config.kuserok 2011-02-14 09:15:12.000000000 +0100
+++ openssh-5.8p1/sshd_config 2011-02-14 09:15:12.000000000 +0100
diff -up openssh-5.8p2/sshd_config.kuserok openssh-5.8p2/sshd_config
--- openssh-5.8p2/sshd_config.kuserok 2011-05-19 16:56:00.886106293 +0200
+++ openssh-5.8p2/sshd_config 2011-05-19 16:56:02.716105342 +0200
@@ -73,6 +73,7 @@ ChallengeResponseAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

15
openssh.spec
View File

@ -74,7 +74,7 @@
# Do not forget to bump pam_ssh_agent_auth release if you rewind the main package release to 1
%define openssh_ver 5.8p2
%define openssh_rel 1
%define openssh_rel 2
%define pam_ssh_agent_ver 0.9.2
%define pam_ssh_agent_rel 31
@ -151,8 +151,6 @@ Patch31: openssh-5.2p1-allow-ip-opts.patch
Patch32: openssh-5.8p1-randclean.patch
# #https://bugzilla.mindrot.org/show_bug.cgi?id=1636
# Patch33: openssh-5.1p1-log-in-chroot.patch
#https://bugzilla.mindrot.org/show_bug.cgi?id=1780
Patch34: openssh-5.8p1-kuserok.patch
#http://cvsweb.netbsd.org/cgi-bin/cvsweb.cgi/src/crypto/dist/ssh/Attic/sftp-glob.c.diff?r1=1.13&r2=1.13.12.1&f=h
Patch35: openssh-5.8p1-glob.patch
#https://bugzilla.mindrot.org/show_bug.cgi?id=1891
@ -182,6 +180,10 @@ Patch60: openssh-5.8p1-gsskex.patch
Patch61: openssh-5.8p1-gssapi-canohost.patch
#?
Patch62: openssh-5.8p1-localdomain.patch
#http://www.mail-archive.com/kerberos@mit.edu/msg17591.html
Patch63: openssh-5.8p2-force_krb.patch
#https://bugzilla.mindrot.org/show_bug.cgi?id=1780
Patch64: openssh-5.8p2-kuserok.patch
#---
#https://bugzilla.mindrot.org/show_bug.cgi?id=1604
# sctp
@ -333,6 +335,7 @@ The module is most useful for su and sudo service stacks.
%setup -q -a 4
#Do not enable by default
###%patch99 -p1 -b .wIm
%patch0 -p1 -b .redhat
%patch100 -p1 -b .fingerprint
%patch200 -p1 -b .exit
@ -368,7 +371,6 @@ popd
%patch30 -p1 -b .keygen
%patch31 -p1 -b .ip-opts
%patch32 -p1 -b .randclean
%patch34 -p1 -b .kuserok
%patch35 -p1 -b .glob
%patch36 -p1 -b .pwchange
%patch37 -p1 -b .keyperm
@ -384,6 +386,8 @@ popd
%patch60 -p1 -b .gsskex
%patch61 -p1 -b .canohost
%patch62 -p1 -b .localdomain
%patch63 -p1 -b .force_krb
%patch64 -p1 -b .kuserok
autoreconf
pushd pam_ssh_agent_auth-%{pam_ssh_agent_ver}
@ -736,6 +740,9 @@ exit 0
%endif
%changelog
* Mon May 23 2011 Jan F. Chadima <jchadima@redhat.com> - 5.8p2-2 + 0.9.2-31
- add gssapi forced command
* Tue May 3 2011 Jan F. Chadima <jchadima@redhat.com> - 5.8p2-1 + 0.9.2-31
- update the openssh version