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freebsd-skq/usr.sbin/gssd/gssd.c
sef 0a594400b5 * Handle SIGPIPE in gssd 
We've got some cases where the other end of gssd's AF_LOCAL socket gets
closed, resulting in an error (and SIGPIPE) when it tries to do I/O to it.
Closing without cleaning up means the next time nfsd starts up, it hangs,
unkillably; this allows gssd to handle that particular error.

* Limit the retry cound in gssd_syscall to 5.
The default is INT_MAX, which effectively means forever.  And it's an
uninterruptable RPC call, so it will never stop.

The two changes mitigate the problem.

Reviewed by:	macklem
MFC after:	2 weeks
Sponsored by:	iXsystems Inc.
Differential Revision:	https://reviews.freebsd.org/D19153
2019-02-21 01:30:37 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#ifndef WITHOUT_KERBEROS
#include <krb5.h>
#endif
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gssapi/gssapi.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#include "gssd.h"
#ifndef _PATH_GSS_MECH
#define _PATH_GSS_MECH "/etc/gss/mech"
#endif
#ifndef _PATH_GSSDSOCK
#define _PATH_GSSDSOCK "/var/run/gssd.sock"
#endif
#define GSSD_CREDENTIAL_CACHE_FILE "/tmp/krb5cc_gssd"
struct gss_resource {
LIST_ENTRY(gss_resource) gr_link;
uint64_t gr_id; /* identifier exported to kernel */
void* gr_res; /* GSS-API resource pointer */
};
LIST_HEAD(gss_resource_list, gss_resource) gss_resources;
int gss_resource_count;
uint32_t gss_next_id;
uint32_t gss_start_time;
int debug_level;
static char ccfile_dirlist[PATH_MAX + 1], ccfile_substring[NAME_MAX + 1];
static char pref_realm[1024];
static int verbose;
static int use_old_des;
static int hostbased_initiator_cred;
#ifndef WITHOUT_KERBEROS
/* 1.2.752.43.13.14 */
static gss_OID_desc gss_krb5_set_allowable_enctypes_x_desc =
{6, (void *) "\x2a\x85\x70\x2b\x0d\x0e"};
static gss_OID GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X =
&gss_krb5_set_allowable_enctypes_x_desc;
static gss_OID_desc gss_krb5_mech_oid_x_desc =
{9, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" };
static gss_OID GSS_KRB5_MECH_OID_X =
&gss_krb5_mech_oid_x_desc;
#endif
static void gssd_load_mech(void);
static int find_ccache_file(const char *, uid_t, char *);
static int is_a_valid_tgt_cache(const char *, uid_t, int *, time_t *);
static void gssd_verbose_out(const char *, ...);
#ifndef WITHOUT_KERBEROS
static krb5_error_code gssd_get_cc_from_keytab(const char *);
static OM_uint32 gssd_get_user_cred(OM_uint32 *, uid_t, gss_cred_id_t *);
#endif
void gssd_terminate(int);
extern void gssd_1(struct svc_req *rqstp, SVCXPRT *transp);
extern int gssd_syscall(char *path);
int
main(int argc, char **argv)
{
/*
* We provide an RPC service on a local-domain socket. The
* kernel's GSS-API code will pass what it can't handle
* directly to us.
*/
struct sockaddr_un sun;
int fd, oldmask, ch, debug;
SVCXPRT *xprt;
/*
* Initialize the credential cache file name substring and the
* search directory list.
*/
strlcpy(ccfile_substring, "krb5cc_", sizeof(ccfile_substring));
ccfile_dirlist[0] = '\0';
pref_realm[0] = '\0';
debug = 0;
verbose = 0;
while ((ch = getopt(argc, argv, "dhovs:c:r:")) != -1) {
switch (ch) {
case 'd':
debug_level++;
break;
case 'h':
#ifndef WITHOUT_KERBEROS
/*
* Enable use of a host based initiator credential
* in the default keytab file.
*/
hostbased_initiator_cred = 1;
#else
errx(1, "This option not available when built"
" without MK_KERBEROS\n");
#endif
break;
case 'o':
#ifndef WITHOUT_KERBEROS
/*
* Force use of DES and the old type of GSSAPI token.
*/
use_old_des = 1;
#else
errx(1, "This option not available when built"
" without MK_KERBEROS\n");
#endif
break;
case 'v':
verbose = 1;
break;
case 's':
#ifndef WITHOUT_KERBEROS
/*
* Set the directory search list. This enables use of
* find_ccache_file() to search the directories for a
* suitable credentials cache file.
*/
strlcpy(ccfile_dirlist, optarg, sizeof(ccfile_dirlist));
#else
errx(1, "This option not available when built"
" without MK_KERBEROS\n");
#endif
break;
case 'c':
/*
* Specify a non-default credential cache file
* substring.
*/
strlcpy(ccfile_substring, optarg,
sizeof(ccfile_substring));
break;
case 'r':
/*
* Set the preferred realm for the credential cache tgt.
*/
strlcpy(pref_realm, optarg, sizeof(pref_realm));
break;
default:
fprintf(stderr,
"usage: %s [-d] [-s dir-list] [-c file-substring]"
" [-r preferred-realm]\n", argv[0]);
exit(1);
break;
}
}
gssd_load_mech();
if (!debug_level) {
if (daemon(0, 0) != 0)
err(1, "Can't daemonize");
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
}
signal(SIGTERM, gssd_terminate);
signal(SIGPIPE, gssd_terminate);
memset(&sun, 0, sizeof sun);
sun.sun_family = AF_LOCAL;
unlink(_PATH_GSSDSOCK);
strcpy(sun.sun_path, _PATH_GSSDSOCK);
sun.sun_len = SUN_LEN(&sun);
fd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (fd < 0) {
if (debug_level == 0) {
syslog(LOG_ERR, "Can't create local gssd socket");
exit(1);
}
err(1, "Can't create local gssd socket");
}
oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
if (bind(fd, (struct sockaddr *) &sun, sun.sun_len) < 0) {
if (debug_level == 0) {
syslog(LOG_ERR, "Can't bind local gssd socket");
exit(1);
}
err(1, "Can't bind local gssd socket");
}
umask(oldmask);
if (listen(fd, SOMAXCONN) < 0) {
if (debug_level == 0) {
syslog(LOG_ERR, "Can't listen on local gssd socket");
exit(1);
}
err(1, "Can't listen on local gssd socket");
}
xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE);
if (!xprt) {
if (debug_level == 0) {
syslog(LOG_ERR,
"Can't create transport for local gssd socket");
exit(1);
}
err(1, "Can't create transport for local gssd socket");
}
if (!svc_reg(xprt, GSSD, GSSDVERS, gssd_1, NULL)) {
if (debug_level == 0) {
syslog(LOG_ERR,
"Can't register service for local gssd socket");
exit(1);
}
err(1, "Can't register service for local gssd socket");
}
LIST_INIT(&gss_resources);
gss_next_id = 1;
gss_start_time = time(0);
gssd_syscall(_PATH_GSSDSOCK);
svc_run();
gssd_syscall("");
return (0);
}
static void
gssd_load_mech(void)
{
FILE *fp;
char buf[256];
char *p;
char *name, *oid, *lib, *kobj;
fp = fopen(_PATH_GSS_MECH, "r");
if (!fp)
return;
while (fgets(buf, sizeof(buf), fp)) {
if (*buf == '#')
continue;
p = buf;
name = strsep(&p, "\t\n ");
if (p) while (isspace(*p)) p++;
oid = strsep(&p, "\t\n ");
if (p) while (isspace(*p)) p++;
lib = strsep(&p, "\t\n ");
if (p) while (isspace(*p)) p++;
kobj = strsep(&p, "\t\n ");
if (!name || !oid || !lib || !kobj)
continue;
if (strcmp(kobj, "-")) {
/*
* Attempt to load the kernel module if its
* not already present.
*/
if (modfind(kobj) < 0) {
if (kldload(kobj) < 0) {
fprintf(stderr,
"%s: can't find or load kernel module %s for %s\n",
getprogname(), kobj, name);
}
}
}
}
fclose(fp);
}
static void *
gssd_find_resource(uint64_t id)
{
struct gss_resource *gr;
if (!id)
return (NULL);
LIST_FOREACH(gr, &gss_resources, gr_link)
if (gr->gr_id == id)
return (gr->gr_res);
return (NULL);
}
static uint64_t
gssd_make_resource(void *res)
{
struct gss_resource *gr;
if (!res)
return (0);
gr = malloc(sizeof(struct gss_resource));
if (!gr)
return (0);
gr->gr_id = (gss_next_id++) + ((uint64_t) gss_start_time << 32);
gr->gr_res = res;
LIST_INSERT_HEAD(&gss_resources, gr, gr_link);
gss_resource_count++;
if (debug_level > 1)
printf("%d resources allocated\n", gss_resource_count);
return (gr->gr_id);
}
static void
gssd_delete_resource(uint64_t id)
{
struct gss_resource *gr;
LIST_FOREACH(gr, &gss_resources, gr_link) {
if (gr->gr_id == id) {
LIST_REMOVE(gr, gr_link);
free(gr);
gss_resource_count--;
if (debug_level > 1)
printf("%d resources allocated\n",
gss_resource_count);
return;
}
}
}
static void
gssd_verbose_out(const char *fmt, ...)
{
va_list ap;
if (verbose != 0) {
va_start(ap, fmt);
if (debug_level == 0)
vsyslog(LOG_INFO | LOG_DAEMON, fmt, ap);
else
vfprintf(stderr, fmt, ap);
va_end(ap);
}
}
bool_t
gssd_null_1_svc(void *argp, void *result, struct svc_req *rqstp)
{
gssd_verbose_out("gssd_null: done\n");
return (TRUE);
}
bool_t
gssd_init_sec_context_1_svc(init_sec_context_args *argp, init_sec_context_res *result, struct svc_req *rqstp)
{
gss_cred_id_t cred = GSS_C_NO_CREDENTIAL;
gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
gss_name_t name = GSS_C_NO_NAME;
char ccname[PATH_MAX + 5 + 1], *cp, *cp2;
int gotone, gotcred;
OM_uint32 min_stat;
#ifndef WITHOUT_KERBEROS
gss_buffer_desc principal_desc;
char enctype[sizeof(uint32_t)];
int key_enctype;
OM_uint32 maj_stat;
#endif
memset(result, 0, sizeof(*result));
if (hostbased_initiator_cred != 0 && argp->cred != 0 &&
argp->uid == 0) {
/*
* These credentials are for a host based initiator name
* in a keytab file, which should now have credentials
* in /tmp/krb5cc_gssd, because gss_acquire_cred() did
* the equivalent of "kinit -k".
*/
snprintf(ccname, sizeof(ccname), "FILE:%s",
GSSD_CREDENTIAL_CACHE_FILE);
} else if (ccfile_dirlist[0] != '\0' && argp->cred == 0) {
/*
* For the "-s" case and no credentials provided as an
* argument, search the directory list for an appropriate
* credential cache file. If the search fails, return failure.
*/
gotone = 0;
cp = ccfile_dirlist;
do {
cp2 = strchr(cp, ':');
if (cp2 != NULL)
*cp2 = '\0';
gotone = find_ccache_file(cp, argp->uid, ccname);
if (gotone != 0)
break;
if (cp2 != NULL)
*cp2++ = ':';
cp = cp2;
} while (cp != NULL && *cp != '\0');
if (gotone == 0) {
result->major_status = GSS_S_CREDENTIALS_EXPIRED;
gssd_verbose_out("gssd_init_sec_context: -s no"
" credential cache file found for uid=%d\n",
(int)argp->uid);
return (TRUE);
}
} else {
/*
* If there wasn't a "-s" option or the credentials have
* been provided as an argument, do it the old way.
* When credentials are provided, the uid should be root.
*/
if (argp->cred != 0 && argp->uid != 0) {
if (debug_level == 0)
syslog(LOG_ERR, "gss_init_sec_context:"
" cred for non-root");
else
fprintf(stderr, "gss_init_sec_context:"
" cred for non-root\n");
}
snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d",
(int) argp->uid);
}
setenv("KRB5CCNAME", ccname, TRUE);
if (argp->cred) {
cred = gssd_find_resource(argp->cred);
if (!cred) {
result->major_status = GSS_S_CREDENTIALS_EXPIRED;
gssd_verbose_out("gssd_init_sec_context: cred"
" resource not found\n");
return (TRUE);
}
}
if (argp->ctx) {
ctx = gssd_find_resource(argp->ctx);
if (!ctx) {
result->major_status = GSS_S_CONTEXT_EXPIRED;
gssd_verbose_out("gssd_init_sec_context: context"
" resource not found\n");
return (TRUE);
}
}
if (argp->name) {
name = gssd_find_resource(argp->name);
if (!name) {
result->major_status = GSS_S_BAD_NAME;
gssd_verbose_out("gssd_init_sec_context: name"
" resource not found\n");
return (TRUE);
}
}
gotcred = 0;
#ifndef WITHOUT_KERBEROS
if (use_old_des != 0) {
if (cred == GSS_C_NO_CREDENTIAL) {
/* Acquire a credential for the uid. */
maj_stat = gssd_get_user_cred(&min_stat, argp->uid,
&cred);
if (maj_stat == GSS_S_COMPLETE)
gotcred = 1;
else
gssd_verbose_out("gssd_init_sec_context: "
"get user cred failed uid=%d major=0x%x "
"minor=%d\n", (int)argp->uid,
(unsigned int)maj_stat, (int)min_stat);
}
if (cred != GSS_C_NO_CREDENTIAL) {
key_enctype = ETYPE_DES_CBC_CRC;
enctype[0] = (key_enctype >> 24) & 0xff;
enctype[1] = (key_enctype >> 16) & 0xff;
enctype[2] = (key_enctype >> 8) & 0xff;
enctype[3] = key_enctype & 0xff;
principal_desc.length = sizeof(enctype);
principal_desc.value = enctype;
result->major_status = gss_set_cred_option(
&result->minor_status, &cred,
GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X,
&principal_desc);
gssd_verbose_out("gssd_init_sec_context: set allowable "
"enctype major=0x%x minor=%d\n",
(unsigned int)result->major_status,
(int)result->minor_status);
if (result->major_status != GSS_S_COMPLETE) {
if (gotcred != 0)
gss_release_cred(&min_stat, &cred);
return (TRUE);
}
}
}
#endif
result->major_status = gss_init_sec_context(&result->minor_status,
cred, &ctx, name, argp->mech_type,
argp->req_flags, argp->time_req, argp->input_chan_bindings,
&argp->input_token, &result->actual_mech_type,
&result->output_token, &result->ret_flags, &result->time_rec);
gssd_verbose_out("gssd_init_sec_context: done major=0x%x minor=%d"
" uid=%d\n", (unsigned int)result->major_status,
(int)result->minor_status, (int)argp->uid);
if (gotcred != 0)
gss_release_cred(&min_stat, &cred);
if (result->major_status == GSS_S_COMPLETE
|| result->major_status == GSS_S_CONTINUE_NEEDED) {
if (argp->ctx)
result->ctx = argp->ctx;
else
result->ctx = gssd_make_resource(ctx);
}
return (TRUE);
}
bool_t
gssd_accept_sec_context_1_svc(accept_sec_context_args *argp, accept_sec_context_res *result, struct svc_req *rqstp)
{
gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
gss_cred_id_t cred = GSS_C_NO_CREDENTIAL;
gss_name_t src_name;
gss_cred_id_t delegated_cred_handle;
memset(result, 0, sizeof(*result));
if (argp->ctx) {
ctx = gssd_find_resource(argp->ctx);
if (!ctx) {
result->major_status = GSS_S_CONTEXT_EXPIRED;
gssd_verbose_out("gssd_accept_sec_context: ctx"
" resource not found\n");
return (TRUE);
}
}
if (argp->cred) {
cred = gssd_find_resource(argp->cred);
if (!cred) {
result->major_status = GSS_S_CREDENTIALS_EXPIRED;
gssd_verbose_out("gssd_accept_sec_context: cred"
" resource not found\n");
return (TRUE);
}
}
memset(result, 0, sizeof(*result));
result->major_status = gss_accept_sec_context(&result->minor_status,
&ctx, cred, &argp->input_token, argp->input_chan_bindings,
&src_name, &result->mech_type, &result->output_token,
&result->ret_flags, &result->time_rec,
&delegated_cred_handle);
gssd_verbose_out("gssd_accept_sec_context: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
if (result->major_status == GSS_S_COMPLETE
|| result->major_status == GSS_S_CONTINUE_NEEDED) {
if (argp->ctx)
result->ctx = argp->ctx;
else
result->ctx = gssd_make_resource(ctx);
result->src_name = gssd_make_resource(src_name);
result->delegated_cred_handle =
gssd_make_resource(delegated_cred_handle);
}
return (TRUE);
}
bool_t
gssd_delete_sec_context_1_svc(delete_sec_context_args *argp, delete_sec_context_res *result, struct svc_req *rqstp)
{
gss_ctx_id_t ctx = gssd_find_resource(argp->ctx);
if (ctx) {
result->major_status = gss_delete_sec_context(
&result->minor_status, &ctx, &result->output_token);
gssd_delete_resource(argp->ctx);
} else {
result->major_status = GSS_S_COMPLETE;
result->minor_status = 0;
}
gssd_verbose_out("gssd_delete_sec_context: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
bool_t
gssd_export_sec_context_1_svc(export_sec_context_args *argp, export_sec_context_res *result, struct svc_req *rqstp)
{
gss_ctx_id_t ctx = gssd_find_resource(argp->ctx);
if (ctx) {
result->major_status = gss_export_sec_context(
&result->minor_status, &ctx,
&result->interprocess_token);
result->format = KGSS_HEIMDAL_1_1;
gssd_delete_resource(argp->ctx);
} else {
result->major_status = GSS_S_FAILURE;
result->minor_status = 0;
result->interprocess_token.length = 0;
result->interprocess_token.value = NULL;
}
gssd_verbose_out("gssd_export_sec_context: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
bool_t
gssd_import_name_1_svc(import_name_args *argp, import_name_res *result, struct svc_req *rqstp)
{
gss_name_t name;
result->major_status = gss_import_name(&result->minor_status,
&argp->input_name_buffer, argp->input_name_type, &name);
gssd_verbose_out("gssd_import_name: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
if (result->major_status == GSS_S_COMPLETE)
result->output_name = gssd_make_resource(name);
else
result->output_name = 0;
return (TRUE);
}
bool_t
gssd_canonicalize_name_1_svc(canonicalize_name_args *argp, canonicalize_name_res *result, struct svc_req *rqstp)
{
gss_name_t name = gssd_find_resource(argp->input_name);
gss_name_t output_name;
memset(result, 0, sizeof(*result));
if (!name) {
result->major_status = GSS_S_BAD_NAME;
return (TRUE);
}
result->major_status = gss_canonicalize_name(&result->minor_status,
name, argp->mech_type, &output_name);
gssd_verbose_out("gssd_canonicalize_name: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
if (result->major_status == GSS_S_COMPLETE)
result->output_name = gssd_make_resource(output_name);
else
result->output_name = 0;
return (TRUE);
}
bool_t
gssd_export_name_1_svc(export_name_args *argp, export_name_res *result, struct svc_req *rqstp)
{
gss_name_t name = gssd_find_resource(argp->input_name);
memset(result, 0, sizeof(*result));
if (!name) {
result->major_status = GSS_S_BAD_NAME;
gssd_verbose_out("gssd_export_name: name resource not found\n");
return (TRUE);
}
result->major_status = gss_export_name(&result->minor_status,
name, &result->exported_name);
gssd_verbose_out("gssd_export_name: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
bool_t
gssd_release_name_1_svc(release_name_args *argp, release_name_res *result, struct svc_req *rqstp)
{
gss_name_t name = gssd_find_resource(argp->input_name);
if (name) {
result->major_status = gss_release_name(&result->minor_status,
&name);
gssd_delete_resource(argp->input_name);
} else {
result->major_status = GSS_S_COMPLETE;
result->minor_status = 0;
}
gssd_verbose_out("gssd_release_name: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
bool_t
gssd_pname_to_uid_1_svc(pname_to_uid_args *argp, pname_to_uid_res *result, struct svc_req *rqstp)
{
gss_name_t name = gssd_find_resource(argp->pname);
uid_t uid;
char buf[1024], *bufp;
struct passwd pwd, *pw;
size_t buflen;
int error;
static size_t buflen_hint = 1024;
memset(result, 0, sizeof(*result));
if (name) {
result->major_status =
gss_pname_to_uid(&result->minor_status,
name, argp->mech, &uid);
if (result->major_status == GSS_S_COMPLETE) {
result->uid = uid;
buflen = buflen_hint;
for (;;) {
pw = NULL;
bufp = buf;
if (buflen > sizeof(buf))
bufp = malloc(buflen);
if (bufp == NULL)
break;
error = getpwuid_r(uid, &pwd, bufp, buflen,
&pw);
if (error != ERANGE)
break;
if (buflen > sizeof(buf))
free(bufp);
buflen += 1024;
if (buflen > buflen_hint)
buflen_hint = buflen;
}
if (pw) {
int len = NGROUPS;
int groups[NGROUPS];
result->gid = pw->pw_gid;
getgrouplist(pw->pw_name, pw->pw_gid,
groups, &len);
result->gidlist.gidlist_len = len;
result->gidlist.gidlist_val =
mem_alloc(len * sizeof(int));
memcpy(result->gidlist.gidlist_val, groups,
len * sizeof(int));
gssd_verbose_out("gssd_pname_to_uid: mapped"
" to uid=%d, gid=%d\n", (int)result->uid,
(int)result->gid);
} else {
result->gid = 65534;
result->gidlist.gidlist_len = 0;
result->gidlist.gidlist_val = NULL;
gssd_verbose_out("gssd_pname_to_uid: mapped"
" to uid=%d, but no groups\n",
(int)result->uid);
}
if (bufp != NULL && buflen > sizeof(buf))
free(bufp);
} else
gssd_verbose_out("gssd_pname_to_uid: failed major=0x%x"
" minor=%d\n", (unsigned int)result->major_status,
(int)result->minor_status);
} else {
result->major_status = GSS_S_BAD_NAME;
result->minor_status = 0;
gssd_verbose_out("gssd_pname_to_uid: no name\n");
}
return (TRUE);
}
bool_t
gssd_acquire_cred_1_svc(acquire_cred_args *argp, acquire_cred_res *result, struct svc_req *rqstp)
{
gss_name_t desired_name = GSS_C_NO_NAME;
gss_cred_id_t cred;
char ccname[PATH_MAX + 5 + 1], *cp, *cp2;
int gotone;
#ifndef WITHOUT_KERBEROS
gss_buffer_desc namebuf;
uint32_t minstat;
krb5_error_code kret;
#endif
memset(result, 0, sizeof(*result));
if (argp->desired_name) {
desired_name = gssd_find_resource(argp->desired_name);
if (!desired_name) {
result->major_status = GSS_S_BAD_NAME;
gssd_verbose_out("gssd_acquire_cred: no desired name"
" found\n");
return (TRUE);
}
}
#ifndef WITHOUT_KERBEROS
if (hostbased_initiator_cred != 0 && argp->desired_name != 0 &&
argp->uid == 0 && argp->cred_usage == GSS_C_INITIATE) {
/* This is a host based initiator name in the keytab file. */
snprintf(ccname, sizeof(ccname), "FILE:%s",
GSSD_CREDENTIAL_CACHE_FILE);
setenv("KRB5CCNAME", ccname, TRUE);
result->major_status = gss_display_name(&result->minor_status,
desired_name, &namebuf, NULL);
gssd_verbose_out("gssd_acquire_cred: desired name for host "
"based initiator cred major=0x%x minor=%d\n",
(unsigned int)result->major_status,
(int)result->minor_status);
if (result->major_status != GSS_S_COMPLETE)
return (TRUE);
if (namebuf.length > PATH_MAX + 5) {
result->minor_status = 0;
result->major_status = GSS_S_FAILURE;
return (TRUE);
}
memcpy(ccname, namebuf.value, namebuf.length);
ccname[namebuf.length] = '\0';
if ((cp = strchr(ccname, '@')) != NULL)
*cp = '/';
kret = gssd_get_cc_from_keytab(ccname);
gssd_verbose_out("gssd_acquire_cred: using keytab entry for "
"%s, kerberos ret=%d\n", ccname, (int)kret);
gss_release_buffer(&minstat, &namebuf);
if (kret != 0) {
result->minor_status = kret;
result->major_status = GSS_S_FAILURE;
return (TRUE);
}
} else
#endif /* !WITHOUT_KERBEROS */
if (ccfile_dirlist[0] != '\0' && argp->desired_name == 0) {
/*
* For the "-s" case and no name provided as an
* argument, search the directory list for an appropriate
* credential cache file. If the search fails, return failure.
*/
gotone = 0;
cp = ccfile_dirlist;
do {
cp2 = strchr(cp, ':');
if (cp2 != NULL)
*cp2 = '\0';
gotone = find_ccache_file(cp, argp->uid, ccname);
if (gotone != 0)
break;
if (cp2 != NULL)
*cp2++ = ':';
cp = cp2;
} while (cp != NULL && *cp != '\0');
if (gotone == 0) {
result->major_status = GSS_S_CREDENTIALS_EXPIRED;
gssd_verbose_out("gssd_acquire_cred: no cred cache"
" file found\n");
return (TRUE);
}
setenv("KRB5CCNAME", ccname, TRUE);
} else {
/*
* If there wasn't a "-s" option or the name has
* been provided as an argument, do it the old way.
* When a name is provided, it will normally exist in the
* default keytab file and the uid will be root.
*/
if (argp->desired_name != 0 && argp->uid != 0) {
if (debug_level == 0)
syslog(LOG_ERR, "gss_acquire_cred:"
" principal_name for non-root");
else
fprintf(stderr, "gss_acquire_cred:"
" principal_name for non-root\n");
}
snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d",
(int) argp->uid);
setenv("KRB5CCNAME", ccname, TRUE);
}
result->major_status = gss_acquire_cred(&result->minor_status,
desired_name, argp->time_req, argp->desired_mechs,
argp->cred_usage, &cred, &result->actual_mechs, &result->time_rec);
gssd_verbose_out("gssd_acquire_cred: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
if (result->major_status == GSS_S_COMPLETE)
result->output_cred = gssd_make_resource(cred);
else
result->output_cred = 0;
return (TRUE);
}
bool_t
gssd_set_cred_option_1_svc(set_cred_option_args *argp, set_cred_option_res *result, struct svc_req *rqstp)
{
gss_cred_id_t cred = gssd_find_resource(argp->cred);
memset(result, 0, sizeof(*result));
if (!cred) {
result->major_status = GSS_S_CREDENTIALS_EXPIRED;
gssd_verbose_out("gssd_set_cred: no credentials\n");
return (TRUE);
}
result->major_status = gss_set_cred_option(&result->minor_status,
&cred, argp->option_name, &argp->option_value);
gssd_verbose_out("gssd_set_cred: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
bool_t
gssd_release_cred_1_svc(release_cred_args *argp, release_cred_res *result, struct svc_req *rqstp)
{
gss_cred_id_t cred = gssd_find_resource(argp->cred);
if (cred) {
result->major_status = gss_release_cred(&result->minor_status,
&cred);
gssd_delete_resource(argp->cred);
} else {
result->major_status = GSS_S_COMPLETE;
result->minor_status = 0;
}
gssd_verbose_out("gssd_release_cred: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
bool_t
gssd_display_status_1_svc(display_status_args *argp, display_status_res *result, struct svc_req *rqstp)
{
result->message_context = argp->message_context;
result->major_status = gss_display_status(&result->minor_status,
argp->status_value, argp->status_type, argp->mech_type,
&result->message_context, &result->status_string);
gssd_verbose_out("gssd_display_status: done major=0x%x minor=%d\n",
(unsigned int)result->major_status, (int)result->minor_status);
return (TRUE);
}
int
gssd_1_freeresult(SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result)
{
/*
* We don't use XDR to free the results - anything which was
* allocated came from GSS-API. We use xdr_result to figure
* out what to do.
*/
OM_uint32 junk;
if (xdr_result == (xdrproc_t) xdr_init_sec_context_res) {
init_sec_context_res *p = (init_sec_context_res *) result;
gss_release_buffer(&junk, &p->output_token);
} else if (xdr_result == (xdrproc_t) xdr_accept_sec_context_res) {
accept_sec_context_res *p = (accept_sec_context_res *) result;
gss_release_buffer(&junk, &p->output_token);
} else if (xdr_result == (xdrproc_t) xdr_delete_sec_context_res) {
delete_sec_context_res *p = (delete_sec_context_res *) result;
gss_release_buffer(&junk, &p->output_token);
} else if (xdr_result == (xdrproc_t) xdr_export_sec_context_res) {
export_sec_context_res *p = (export_sec_context_res *) result;
if (p->interprocess_token.length)
memset(p->interprocess_token.value, 0,
p->interprocess_token.length);
gss_release_buffer(&junk, &p->interprocess_token);
} else if (xdr_result == (xdrproc_t) xdr_export_name_res) {
export_name_res *p = (export_name_res *) result;
gss_release_buffer(&junk, &p->exported_name);
} else if (xdr_result == (xdrproc_t) xdr_acquire_cred_res) {
acquire_cred_res *p = (acquire_cred_res *) result;
gss_release_oid_set(&junk, &p->actual_mechs);
} else if (xdr_result == (xdrproc_t) xdr_pname_to_uid_res) {
pname_to_uid_res *p = (pname_to_uid_res *) result;
if (p->gidlist.gidlist_val)
free(p->gidlist.gidlist_val);
} else if (xdr_result == (xdrproc_t) xdr_display_status_res) {
display_status_res *p = (display_status_res *) result;
gss_release_buffer(&junk, &p->status_string);
}
return (TRUE);
}
/*
* Search a directory for the most likely candidate to be used as the
* credential cache for a uid. If successful, return 1 and fill the
* file's path id into "rpath". Otherwise, return 0.
*/
static int
find_ccache_file(const char *dirpath, uid_t uid, char *rpath)
{
DIR *dirp;
struct dirent *dp;
struct stat sb;
time_t exptime, oexptime;
int gotone, len, rating, orating;
char namepath[PATH_MAX + 5 + 1];
char retpath[PATH_MAX + 5 + 1];
dirp = opendir(dirpath);
if (dirp == NULL)
return (0);
gotone = 0;
orating = 0;
oexptime = 0;
while ((dp = readdir(dirp)) != NULL) {
len = snprintf(namepath, sizeof(namepath), "%s/%s", dirpath,
dp->d_name);
if (len < sizeof(namepath) &&
(hostbased_initiator_cred == 0 || strcmp(namepath,
GSSD_CREDENTIAL_CACHE_FILE) != 0) &&
strstr(dp->d_name, ccfile_substring) != NULL &&
lstat(namepath, &sb) >= 0 &&
sb.st_uid == uid &&
S_ISREG(sb.st_mode)) {
len = snprintf(namepath, sizeof(namepath), "FILE:%s/%s",
dirpath, dp->d_name);
if (len < sizeof(namepath) &&
is_a_valid_tgt_cache(namepath, uid, &rating,
&exptime) != 0) {
if (gotone == 0 || rating > orating ||
(rating == orating && exptime > oexptime)) {
orating = rating;
oexptime = exptime;
strcpy(retpath, namepath);
gotone = 1;
}
}
}
}
closedir(dirp);
if (gotone != 0) {
strcpy(rpath, retpath);
return (1);
}
return (0);
}
/*
* Try to determine if the file is a valid tgt cache file.
* Check that the file has a valid tgt for a principal.
* If it does, return 1, otherwise return 0.
* It also returns a "rating" and the expiry time for the TGT, when found.
* This "rating" is higher based on heuristics that make it more
* likely to be the correct credential cache file to use. It can
* be used by the caller, along with expiry time, to select from
* multiple credential cache files.
*/
static int
is_a_valid_tgt_cache(const char *filepath, uid_t uid, int *retrating,
time_t *retexptime)
{
#ifndef WITHOUT_KERBEROS
krb5_context context;
krb5_principal princ;
krb5_ccache ccache;
krb5_error_code retval;
krb5_cc_cursor curse;
krb5_creds krbcred;
int gotone, orating, rating, ret;
struct passwd *pw;
char *cp, *cp2, *pname;
time_t exptime;
/* Find a likely name for the uid principal. */
pw = getpwuid(uid);
/*
* Do a bunch of krb5 library stuff to try and determine if
* this file is a credentials cache with an appropriate TGT
* in it.
*/
retval = krb5_init_context(&context);
if (retval != 0)
return (0);
retval = krb5_cc_resolve(context, filepath, &ccache);
if (retval != 0) {
krb5_free_context(context);
return (0);
}
ret = 0;
orating = 0;
exptime = 0;
retval = krb5_cc_start_seq_get(context, ccache, &curse);
if (retval == 0) {
while ((retval = krb5_cc_next_cred(context, ccache, &curse,
&krbcred)) == 0) {
gotone = 0;
rating = 0;
retval = krb5_unparse_name(context, krbcred.server,
&pname);
if (retval == 0) {
cp = strchr(pname, '/');
if (cp != NULL) {
*cp++ = '\0';
if (strcmp(pname, "krbtgt") == 0 &&
krbcred.times.endtime > time(NULL)
) {
gotone = 1;
/*
* Test to see if this is a
* tgt for cross-realm auth.
* Rate it higher, if it is not.
*/
cp2 = strchr(cp, '@');
if (cp2 != NULL) {
*cp2++ = '\0';
if (strcmp(cp, cp2) ==
0)
rating++;
}
}
}
free(pname);
}
if (gotone != 0) {
retval = krb5_unparse_name(context,
krbcred.client, &pname);
if (retval == 0) {
cp = strchr(pname, '@');
if (cp != NULL) {
*cp++ = '\0';
if (pw != NULL && strcmp(pname,
pw->pw_name) == 0)
rating++;
if (strchr(pname, '/') == NULL)
rating++;
if (pref_realm[0] != '\0' &&
strcmp(cp, pref_realm) == 0)
rating++;
}
}
free(pname);
if (rating > orating) {
orating = rating;
exptime = krbcred.times.endtime;
} else if (rating == orating &&
krbcred.times.endtime > exptime)
exptime = krbcred.times.endtime;
ret = 1;
}
krb5_free_cred_contents(context, &krbcred);
}
krb5_cc_end_seq_get(context, ccache, &curse);
}
krb5_cc_close(context, ccache);
krb5_free_context(context);
if (ret != 0) {
*retrating = orating;
*retexptime = exptime;
}
return (ret);
#else /* WITHOUT_KERBEROS */
return (0);
#endif /* !WITHOUT_KERBEROS */
}
#ifndef WITHOUT_KERBEROS
/*
* This function attempts to do essentially a "kinit -k" for the principal
* name provided as the argument, so that there will be a TGT in the
* credential cache.
*/
static krb5_error_code
gssd_get_cc_from_keytab(const char *name)
{
krb5_error_code ret, opt_ret, princ_ret, cc_ret, kt_ret, cred_ret;
krb5_context context;
krb5_principal principal;
krb5_keytab kt;
krb5_creds cred;
krb5_get_init_creds_opt *opt;
krb5_deltat start_time = 0;
krb5_ccache ccache;
ret = krb5_init_context(&context);
if (ret != 0)
return (ret);
opt_ret = cc_ret = kt_ret = cred_ret = 1; /* anything non-zero */
princ_ret = ret = krb5_parse_name(context, name, &principal);
if (ret == 0)
opt_ret = ret = krb5_get_init_creds_opt_alloc(context, &opt);
if (ret == 0)
cc_ret = ret = krb5_cc_default(context, &ccache);
if (ret == 0)
ret = krb5_cc_initialize(context, ccache, principal);
if (ret == 0) {
krb5_get_init_creds_opt_set_default_flags(context, "gssd",
krb5_principal_get_realm(context, principal), opt);
kt_ret = ret = krb5_kt_default(context, &kt);
}
if (ret == 0)
cred_ret = ret = krb5_get_init_creds_keytab(context, &cred,
principal, kt, start_time, NULL, opt);
if (ret == 0)
ret = krb5_cc_store_cred(context, ccache, &cred);
if (kt_ret == 0)
krb5_kt_close(context, kt);
if (cc_ret == 0)
krb5_cc_close(context, ccache);
if (opt_ret == 0)
krb5_get_init_creds_opt_free(context, opt);
if (princ_ret == 0)
krb5_free_principal(context, principal);
if (cred_ret == 0)
krb5_free_cred_contents(context, &cred);
krb5_free_context(context);
return (ret);
}
/*
* Acquire a gss credential for a uid.
*/
static OM_uint32
gssd_get_user_cred(OM_uint32 *min_statp, uid_t uid, gss_cred_id_t *credp)
{
gss_buffer_desc principal_desc;
gss_name_t name;
OM_uint32 maj_stat, min_stat;
gss_OID_set mechlist;
struct passwd *pw;
pw = getpwuid(uid);
if (pw == NULL) {
*min_statp = 0;
return (GSS_S_FAILURE);
}
/*
* The mechanism must be set to KerberosV for acquisition
* of credentials to work reliably.
*/
maj_stat = gss_create_empty_oid_set(min_statp, &mechlist);
if (maj_stat != GSS_S_COMPLETE)
return (maj_stat);
maj_stat = gss_add_oid_set_member(min_statp, GSS_KRB5_MECH_OID_X,
&mechlist);
if (maj_stat != GSS_S_COMPLETE) {
gss_release_oid_set(&min_stat, &mechlist);
return (maj_stat);
}
principal_desc.value = (void *)pw->pw_name;
principal_desc.length = strlen(pw->pw_name);
maj_stat = gss_import_name(min_statp, &principal_desc,
GSS_C_NT_USER_NAME, &name);
if (maj_stat != GSS_S_COMPLETE) {
gss_release_oid_set(&min_stat, &mechlist);
return (maj_stat);
}
/* Acquire the credentials. */
maj_stat = gss_acquire_cred(min_statp, name, 0, mechlist,
GSS_C_INITIATE, credp, NULL, NULL);
gss_release_name(&min_stat, &name);
gss_release_oid_set(&min_stat, &mechlist);
return (maj_stat);
}
#endif /* !WITHOUT_KERBEROS */
void gssd_terminate(int sig __unused)
{
#ifndef WITHOUT_KERBEROS
if (hostbased_initiator_cred != 0)
unlink(GSSD_CREDENTIAL_CACHE_FILE);
#endif
gssd_syscall("");
exit(0);
}
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