4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/utils/gss/lgss_keyring.c
33 * user-space upcall to create GSS context, using keyring interface to kernel
35 * Author: Eric Mei <ericm@clusterfs.com>
39 #include <sys/types.h>
50 #include <gssapi/gssapi.h>
53 #include <libcfs/util/param.h>
54 #include <libcfs/util/string.h>
56 #include "lgss_utils.h"
57 #include "write_bytes.h"
61 * gss target string of lustre service we are negotiating for
63 static char *g_service = NULL;
66 * all data about negotiation
68 struct lgss_nego_data {
69 uint32_t lnd_established:1;
76 gss_OID lnd_mech; /* mech OID */
77 gss_name_t lnd_svc_name; /* service name */
78 unsigned int lnd_req_flags; /* request flags */
79 gss_cred_id_t lnd_cred; /* credential */
80 gss_ctx_id_t lnd_ctx; /* session context */
81 gss_buffer_desc lnd_rmt_ctx; /* remote handle of context */
82 gss_buffer_desc lnd_ctx_token; /* context token for kernel */
83 uint32_t lnd_seq_win; /* sequence window */
90 * context creation response
92 struct lgss_init_res {
93 gss_buffer_desc gr_ctx; /* context handle */
94 unsigned int gr_major; /* major status */
95 unsigned int gr_minor; /* minor status */
96 unsigned int gr_win; /* sequence window */
97 gss_buffer_desc gr_token; /* token */
100 struct keyring_upcall_param {
109 uint64_t kup_selfnid;
113 unsigned int kup_is_root:1,
119 /****************************************
120 * child process: gss negotiation *
121 ****************************************/
123 static int send_to(int fd, const void *buf, size_t size)
127 sz = write(fd, buf, size);
129 logmsg(LL_ERR, "cannot send to GSS process: %s\n",
134 logmsg(LL_ERR, "short write sending to GSS process: %d/%d\n",
142 static int receive_from(int fd, void *buf, size_t size)
146 sz = read(fd, buf, size);
148 logmsg(LL_ERR, "cannot receive from GSS process: %s\n",
153 logmsg(LL_ERR, "short read receiving from GSS process: %d/%d\n",
161 static int gss_do_ioctl(struct lgssd_ioctl_param *param)
167 rc = cfs_get_param_paths(&path, "sptlrpc/gss/init_channel");
171 logmsg(LL_TRACE, "to open %s\n", path.gl_pathv[0]);
173 fd = open(path.gl_pathv[0], O_WRONLY);
175 logmsg(LL_ERR, "can't open %s\n", path.gl_pathv[0]);
180 logmsg(LL_TRACE, "to down-write\n");
182 ret = write(fd, param, sizeof(*param));
184 if (ret != sizeof(*param)) {
185 logmsg(LL_ERR, "lustre ioctl err: %s\n", strerror(errno));
190 cfs_free_param_data(&path);
194 int do_nego_rpc(struct lgss_nego_data *lnd,
195 gss_buffer_desc *gss_token,
196 struct lgss_init_res *gr,
197 int req_fd[2], int reply_fd[2])
199 struct lgssd_ioctl_param param;
202 char outbuf[8192] = { 0 };
206 logmsg(LL_TRACE, "start negotiation rpc\n");
208 pw = getpwuid(lnd->lnd_uid);
210 logmsg(LL_ERR, "no uid %u in local user database\n",
215 param.version = GSSD_INTERFACE_VERSION;
216 param.secid = lnd->lnd_secid;
217 param.uuid = lnd->lnd_uuid;
218 param.lustre_svc = lnd->lnd_lsvc;
219 param.uid = lnd->lnd_uid;
220 param.gid = pw->pw_gid;
221 param.send_token_size = gss_token->length;
222 param.send_token = (char *) gss_token->value;
224 if (req_fd[0] == -1 && reply_fd[0] == -1) {
225 /* we can do the ioctl directly */
226 param.reply_buf_size = sizeof(outbuf);
227 param.reply_buf = outbuf;
229 rc = gss_do_ioctl(¶m);
233 /* looks like we are running in a container,
234 * so we cannot do the ioctl ourselves: delegate to
235 * parent process running directly on host */
237 /* send ioctl buffer to parent */
238 rc = send_to(req_fd[1], ¶m, sizeof(param));
241 /* send gss token to parent */
242 rc = send_to(req_fd[1], gss_token->value, gss_token->length);
246 /* read ioctl status from parent */
247 rc = receive_from(reply_fd[0], ¶m.status,
248 sizeof(param.status));
252 if (param.status == 0) {
253 /* read reply buffer from parent */
254 rc = receive_from(reply_fd[0], outbuf, sizeof(outbuf));
260 logmsg(LL_TRACE, "do_nego_rpc: to parse reply\n");
262 logmsg(LL_ERR, "status: %ld (%s)\n",
263 param.status, strerror((int)(-param.status)));
267 p = (unsigned int *)outbuf;
273 gr->gr_ctx.length = *p++;
274 gr->gr_ctx.value = malloc(gr->gr_ctx.length);
275 if (gr->gr_ctx.value == NULL)
277 memcpy(gr->gr_ctx.value, p, gr->gr_ctx.length);
278 p += (((gr->gr_ctx.length + 3) & ~3) / 4);
280 gr->gr_token.length = *p++;
281 gr->gr_token.value = malloc(gr->gr_token.length);
282 if (gr->gr_token.value == NULL) {
283 free(gr->gr_ctx.value);
286 memcpy(gr->gr_token.value, p, gr->gr_token.length);
287 p += (((gr->gr_token.length + 3) & ~3) / 4);
289 logmsg(LL_DEBUG, "do_nego_rpc: receive handle len %zu, token len %zu, "
290 "res %d\n", gr->gr_ctx.length, gr->gr_token.length, res);
295 /* This is used by incomplete GSSAPI implementations that can't use
296 * gss_init_sec_context and will parse the token themselves (gssnull and sk).
297 * Callers should have cred->lc_mech_token pointing to a gss_buffer_desc
298 * token to send to the peer as part of the SEC_CTX_INIT operation. The return
299 * RPC's token with be in gr.gr_token which is validated using
300 * lgss_validate_cred. */
301 static int lgssc_negotiation_manual(struct lgss_nego_data *lnd,
302 struct lgss_cred *cred,
303 int req_fd[2], int reply_fd[2])
305 struct lgss_init_res gr;
309 logmsg(LL_TRACE, "starting gss negotation\n");
310 memset(&gr, 0, sizeof(gr));
312 lnd->lnd_rpc_err = do_nego_rpc(lnd, &cred->lc_mech_token, &gr,
314 if (lnd->lnd_rpc_err) {
315 logmsg(LL_ERR, "negotiation rpc error %d\n", lnd->lnd_rpc_err);
316 rc = lnd->lnd_rpc_err;
320 if (gr.gr_major == GSS_S_CONTINUE_NEEDED) {
324 } else if (gr.gr_major != GSS_S_COMPLETE) {
325 lnd->lnd_gss_err = gr.gr_major;
326 logmsg(LL_ERR, "negotiation gss error %x\n", lnd->lnd_gss_err);
331 if (gr.gr_ctx.length == 0 || gr.gr_token.length == 0) {
332 logmsg(LL_ERR, "zero length context or token received\n");
337 rc = lgss_validate_cred(cred, &gr.gr_token, &lnd->lnd_ctx_token);
339 logmsg(LL_ERR, "peer token failed validation\n");
343 lnd->lnd_established = 1;
344 lnd->lnd_seq_win = gr.gr_win;
345 lnd->lnd_rmt_ctx = gr.gr_ctx;
347 if (gr.gr_token.length != 0)
348 gss_release_buffer(&min_stat, &gr.gr_token);
350 logmsg(LL_DEBUG, "successfully negotiated a context\n");
354 if (gr.gr_ctx.length != 0)
355 gss_release_buffer(&min_stat, &gr.gr_ctx);
356 if (gr.gr_token.length != 0)
357 gss_release_buffer(&min_stat, &gr.gr_token);
363 * if return error, the lnd_rpc_err or lnd_gss_err is set.
365 static int lgssc_negotiation(struct lgss_nego_data *lnd, int req_fd[2],
368 struct lgss_init_res gr;
369 gss_buffer_desc *recv_tokenp, send_token;
370 OM_uint32 maj_stat, min_stat, ret_flags;
372 logmsg(LL_TRACE, "start gss negotiation\n");
374 /* GSS context establishment loop. */
375 memset(&gr, 0, sizeof(gr));
376 recv_tokenp = GSS_C_NO_BUFFER;
379 maj_stat = gss_init_sec_context(&min_stat,
388 NULL, /* used mech */
391 NULL); /* time rec */
393 if (recv_tokenp != GSS_C_NO_BUFFER) {
394 gss_release_buffer(&min_stat, &gr.gr_token);
395 recv_tokenp = GSS_C_NO_BUFFER;
398 if (maj_stat != GSS_S_COMPLETE &&
399 maj_stat != GSS_S_CONTINUE_NEEDED) {
400 lnd->lnd_gss_err = maj_stat;
402 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
403 "failed init context");
407 if (send_token.length != 0) {
408 memset(&gr, 0, sizeof(gr));
410 lnd->lnd_rpc_err = do_nego_rpc(lnd, &send_token, &gr,
412 gss_release_buffer(&min_stat, &send_token);
414 if (lnd->lnd_rpc_err) {
415 logmsg(LL_ERR, "negotiation rpc error: %d\n",
417 return lnd->lnd_rpc_err;
420 if (gr.gr_major != GSS_S_COMPLETE &&
421 gr.gr_major != GSS_S_CONTINUE_NEEDED) {
422 lnd->lnd_gss_err = gr.gr_major;
424 logmsg(LL_ERR, "negotiation gss error %x\n",
429 if (gr.gr_ctx.length != 0) {
430 if (lnd->lnd_rmt_ctx.value)
431 gss_release_buffer(&min_stat,
433 lnd->lnd_rmt_ctx = gr.gr_ctx;
436 if (gr.gr_token.length != 0) {
437 if (maj_stat != GSS_S_CONTINUE_NEEDED)
439 recv_tokenp = &gr.gr_token;
443 /* GSS_S_COMPLETE => check gss header verifier,
444 * usually checked in gss_validate
446 if (maj_stat == GSS_S_COMPLETE) {
447 lnd->lnd_established = 1;
448 lnd->lnd_seq_win = gr.gr_win;
453 /* End context negotiation loop. */
454 if (!lnd->lnd_established) {
455 if (gr.gr_token.length != 0)
456 gss_release_buffer(&min_stat, &gr.gr_token);
458 if (lnd->lnd_gss_err == GSS_S_COMPLETE)
459 lnd->lnd_rpc_err = -EACCES;
461 logmsg(LL_ERR, "context negotiation failed\n");
465 logmsg(LL_DEBUG, "successfully negotiated a context\n");
470 * if return error, the lnd_rpc_err or lnd_gss_err is set.
472 static int lgssc_init_nego_data(struct lgss_nego_data *lnd,
473 struct keyring_upcall_param *kup,
476 gss_buffer_desc sname;
477 OM_uint32 maj_stat, min_stat;
479 memset(lnd, 0, sizeof(*lnd));
481 lnd->lnd_secid = kup->kup_secid;
482 lnd->lnd_uid = kup->kup_uid;
483 lnd->lnd_lsvc = kup->kup_svc | mech << LUSTRE_GSS_MECH_SHIFT;
484 lnd->lnd_uuid = kup->kup_tgt;
486 lnd->lnd_established = 0;
487 lnd->lnd_svc_name = GSS_C_NO_NAME;
488 lnd->lnd_cred = GSS_C_NO_CREDENTIAL;
489 lnd->lnd_ctx = GSS_C_NO_CONTEXT;
490 lnd->lnd_rmt_ctx = (gss_buffer_desc) GSS_C_EMPTY_BUFFER;
491 lnd->lnd_seq_win = 0;
495 lnd->lnd_mech = (gss_OID)&krb5oid;
496 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
499 lnd->lnd_mech = (gss_OID)&nulloid;
501 #ifdef HAVE_OPENSSL_SSK
503 lnd->lnd_mech = (gss_OID)&skoid;
504 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
508 logmsg(LL_ERR, "invalid mech: %d\n", mech);
509 lnd->lnd_rpc_err = -EACCES;
513 sname.value = g_service;
514 sname.length = strlen(g_service);
516 maj_stat = gss_import_name(&min_stat, &sname,
517 (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
519 if (maj_stat != GSS_S_COMPLETE) {
520 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
521 "can't import svc name");
522 lnd->lnd_gss_err = maj_stat;
529 void lgssc_fini_nego_data(struct lgss_nego_data *lnd)
531 OM_uint32 maj_stat, min_stat;
533 if (lnd->lnd_svc_name != GSS_C_NO_NAME) {
534 maj_stat = gss_release_name(&min_stat, &lnd->lnd_svc_name);
535 if (maj_stat != GSS_S_COMPLETE)
536 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
537 "can't release service name");
540 if (lnd->lnd_cred != GSS_C_NO_CREDENTIAL) {
541 maj_stat = gss_release_cred(&min_stat, &lnd->lnd_cred);
542 if (maj_stat != GSS_S_COMPLETE)
543 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
544 "can't release credential");
549 int error_kernel_key(key_serial_t keyid, int rpc_error, int gss_error)
555 logmsg(LL_TRACE, "revoking kernel key %08x\n", keyid);
558 end = buf + sizeof(buf);
560 WRITE_BYTES(&p, end, seqwin);
561 WRITE_BYTES(&p, end, rpc_error);
562 WRITE_BYTES(&p, end, gss_error);
565 if (keyctl_update(keyid, buf, p - buf)) {
566 if (errno != EAGAIN) {
567 logmsg(LL_ERR, "revoke key %08x: %s\n",
568 keyid, strerror(errno));
572 logmsg(LL_WARN, "key %08x: revoking too soon, try again\n",
578 logmsg(LL_INFO, "key %08x: revoked\n", keyid);
583 int update_kernel_key(key_serial_t keyid,
584 struct lgss_nego_data *lnd,
585 gss_buffer_desc *ctx_token)
587 char *buf = NULL, *p = NULL, *end = NULL;
588 unsigned int buf_size = 0;
591 logmsg(LL_TRACE, "updating kernel key %08x\n", keyid);
593 buf_size = sizeof(lnd->lnd_seq_win) +
594 sizeof(lnd->lnd_rmt_ctx.length) + lnd->lnd_rmt_ctx.length +
595 sizeof(ctx_token->length) + ctx_token->length;
596 buf = malloc(buf_size);
598 logmsg(LL_ERR, "key %08x: can't alloc update buf: size %d\n",
604 end = buf + buf_size;
607 if (WRITE_BYTES(&p, end, lnd->lnd_seq_win))
609 if (write_buffer(&p, end, &lnd->lnd_rmt_ctx))
611 if (write_buffer(&p, end, ctx_token))
615 if (keyctl_update(keyid, buf, p - buf)) {
616 if (errno != EAGAIN) {
617 logmsg(LL_ERR, "update key %08x: %s\n",
618 keyid, strerror(errno));
622 logmsg(LL_DEBUG, "key %08x: updating too soon, try again\n",
629 logmsg(LL_DEBUG, "key %08x: updated\n", keyid);
635 static int lgssc_kr_negotiate_krb(key_serial_t keyid, struct lgss_cred *cred,
636 struct keyring_upcall_param *kup,
637 int req_fd[2], int reply_fd[2])
639 struct lgss_nego_data lnd;
644 if (lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid)) {
645 logmsg(LL_ERR, "key %08x: failed to construct service "
647 error_kernel_key(keyid, -EACCES, 0);
651 if (lgss_using_cred(cred)) {
652 logmsg(LL_ERR, "key %08x: can't using cred\n", keyid);
653 error_kernel_key(keyid, -EACCES, 0);
658 memset(&lnd, 0, sizeof(lnd));
659 if (lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n)) {
660 logmsg(LL_ERR, "key %08x: failed to initialize "
661 "negotiation data\n", keyid);
662 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
666 rc = lgssc_negotiation(&lnd, req_fd, reply_fd);
667 if (rc == -EAGAIN || (rc == -ETIMEDOUT && redo)) {
668 logmsg(LL_ERR, "Failed negotiation must retry\n");
672 logmsg(LL_ERR, "key %08x: failed to negotiation\n", keyid);
673 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
677 rc = serialize_context_for_kernel(lnd.lnd_ctx, &lnd.lnd_ctx_token,
680 logmsg(LL_ERR, "key %08x: failed to export context\n", keyid);
681 error_kernel_key(keyid, rc, lnd.lnd_gss_err);
685 rc = update_kernel_key(keyid, &lnd, &lnd.lnd_ctx_token);
690 logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
691 keyid, kup->kup_uid);
693 if (lnd.lnd_ctx_token.length != 0)
694 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
696 lgssc_fini_nego_data(&lnd);
699 lgss_release_cred(cred);
703 static int lgssc_kr_negotiate_manual(key_serial_t keyid, struct lgss_cred *cred,
704 struct keyring_upcall_param *kup,
705 int req_fd[2], int reply_fd[2])
707 struct lgss_nego_data lnd;
712 rc = lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid);
714 logmsg(LL_ERR, "key %08x: failed to construct service "
716 error_kernel_key(keyid, -EACCES, 0);
720 rc = lgss_using_cred(cred);
722 logmsg(LL_ERR, "key %08x: can't use cred\n", keyid);
723 error_kernel_key(keyid, -EACCES, 0);
728 memset(&lnd, 0, sizeof(lnd));
729 rc = lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n);
731 logmsg(LL_ERR, "key %08x: failed to initialize "
732 "negotiation data\n", keyid);
733 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
738 * Handles the negotiation but then calls lgss_validate to make sure
739 * the token is valid. It also populates the lnd_ctx_token for the
740 * update to the kernel key
742 rc = lgssc_negotiation_manual(&lnd, cred, req_fd, reply_fd);
743 if (rc == -EAGAIN || (rc == -ETIMEDOUT && redo)) {
744 logmsg(LL_ERR, "Failed negotiation must retry\n");
748 logmsg(LL_ERR, "key %08x: failed to negotiate\n", keyid);
749 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
753 rc = update_kernel_key(keyid, &lnd, &lnd.lnd_ctx_token);
757 logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
758 keyid, kup->kup_uid);
760 if (lnd.lnd_ctx_token.length != 0)
761 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
763 lgssc_fini_nego_data(&lnd);
766 lgss_release_cred(cred);
771 * note we inherited assumed authority from parent process
773 static int lgssc_kr_negotiate(key_serial_t keyid, struct lgss_cred *cred,
774 struct keyring_upcall_param *kup,
775 int req_fd[2], int reply_fd[2])
779 logmsg(LL_TRACE, "child start on behalf of key %08x: "
780 "cred %p, uid %u, svc %u, nid %"PRIx64", uids: %u:%u/%u:%u\n",
781 keyid, cred, cred->lc_uid, cred->lc_tgt_svc, cred->lc_tgt_nid,
782 kup->kup_uid, kup->kup_gid, kup->kup_fsuid, kup->kup_fsgid);
784 switch (cred->lc_mech->lmt_mech_n) {
787 rc = lgssc_kr_negotiate_manual(keyid, cred, kup,
792 rc = lgssc_kr_negotiate_krb(keyid, cred, kup, req_fd, reply_fd);
800 * call out info format: s[:s]...
802 * [1]: mech_name (string)
805 * [4]: flags (string) FMT: r-root; m-mdt; o-ost
806 * [5]: svc type (char)
807 * [6]: lustre_svc (int)
808 * [7]: target_nid (uint64)
809 * [8]: target_uuid (string)
810 * [9]: self_nid (uint64)
813 static int parse_callout_info(const char *coinfo,
814 struct keyring_upcall_param *uparam)
816 const int nargs = 11;
823 length = strlen(coinfo) + 1;
825 logmsg(LL_ERR, "coinfo too long\n");
828 memcpy(buf, coinfo, length);
830 for (i = 0; i < nargs - 1; i++) {
831 pos = strchr(string, ':');
833 logmsg(LL_ERR, "short of components\n");
843 logmsg(LL_TRACE, "components: %s,%s,%s,%s,%s,%c,%s,%s,%s,%s,%s\n",
844 data[0], data[1], data[2], data[3], data[4], data[5][0],
845 data[6], data[7], data[8], data[9], data[10]);
847 uparam->kup_secid = strtol(data[0], NULL, 0);
848 snprintf(uparam->kup_mech, sizeof(uparam->kup_mech), "%s", data[1]);
849 uparam->kup_uid = strtol(data[2], NULL, 0);
850 uparam->kup_gid = strtol(data[3], NULL, 0);
851 if (strchr(data[4], 'r'))
852 uparam->kup_is_root = 1;
853 if (strchr(data[4], 'm'))
854 uparam->kup_is_mdt = 1;
855 if (strchr(data[4], 'o'))
856 uparam->kup_is_ost = 1;
857 uparam->kup_svc_type = data[5][0];
858 uparam->kup_svc = strtol(data[6], NULL, 0);
859 uparam->kup_nid = strtoll(data[7], NULL, 0);
860 snprintf(uparam->kup_tgt, sizeof(uparam->kup_tgt), "%s", data[8]);
861 uparam->kup_selfnid = strtoll(data[9], NULL, 0);
862 uparam->kup_pid = strtol(data[10], NULL, 0);
864 logmsg(LL_DEBUG, "parse call out info: secid %d, mech %s, ugid %u:%u, "
865 "is_root %d, is_mdt %d, is_ost %d, svc type %c, svc %d, "
866 "nid 0x%"PRIx64", tgt %s, self nid 0x%"PRIx64", pid %d\n",
867 uparam->kup_secid, uparam->kup_mech,
868 uparam->kup_uid, uparam->kup_gid,
869 uparam->kup_is_root, uparam->kup_is_mdt, uparam->kup_is_ost,
870 uparam->kup_svc_type, uparam->kup_svc, uparam->kup_nid,
871 uparam->kup_tgt, uparam->kup_selfnid, uparam->kup_pid);
875 static void set_log_level()
881 if (cfs_get_param_paths(&path,
882 "sptlrpc/gss/lgss_keyring/debug_level") != 0)
884 file = fopen(path.gl_pathv[0], "r");
886 cfs_free_param_data(&path);
890 if (fscanf(file, "%u", &level) != 1)
896 lgss_set_loglevel(level);
898 cfs_free_param_data(&path);
902 static int associate_with_ns(char *path)
906 fd = open(path, O_RDONLY);
915 static int prepare_and_instantiate(struct lgss_cred *cred, key_serial_t keyid,
918 key_serial_t inst_keyring;
920 if (lgss_prepare_cred(cred)) {
921 logmsg(LL_ERR, "key %08x: failed to prepare credentials "
922 "for user %d\n", keyid, uid);
926 /* pre initialize the key. note the keyring linked to is actually of the
927 * original requesting process, not _this_ upcall process. if it's for
928 * root user, don't link to any keyrings because we want fully control
929 * on it, and share it among all root sessions; otherswise link to
932 if (cred->lc_root_flags != 0)
935 inst_keyring = KEY_SPEC_SESSION_KEYRING;
937 if (keyctl_instantiate(keyid, NULL, 0, inst_keyring)) {
938 logmsg(LL_ERR, "instantiate key %08x: %s\n",
939 keyid, strerror(errno));
943 logmsg(LL_TRACE, "instantiated kernel key %08x\n", keyid);
948 /****************************************
950 ****************************************/
952 int main(int argc, char *argv[])
954 struct keyring_upcall_param uparam;
958 int req_fd[2] = { -1, -1 };
959 int reply_fd[2] = { -1, -1 };
960 struct lgss_mech_type *mech;
961 struct lgss_cred *cred;
962 char path[PATH_MAX] = "";
965 struct stat parent_ns = { .st_ino = 0 };
966 struct stat caller_ns = { .st_ino = 0 };
970 logmsg(LL_TRACE, "start parsing parameters\n");
972 * parse & sanity check upcall parameters
973 * expected to be called with:
977 * [4]: key description
981 * [8]: thread keyring
982 * [9]: process keyring
983 * [10]: session keyring
985 if (argc != 10 + 1) {
986 logmsg(LL_ERR, "invalid parameter number %d\n", argc);
990 logmsg(LL_INFO, "key %s, desc %s, ugid %s:%s, sring %s, coinfo %s\n",
991 argv[2], argv[4], argv[6], argv[7], argv[10], argv[5]);
993 memset(&uparam, 0, sizeof(uparam));
995 if (strcmp(argv[1], "create") != 0) {
996 logmsg(LL_ERR, "invalid OP %s\n", argv[1]);
1000 if (sscanf(argv[2], "%d", &keyid) != 1) {
1001 logmsg(LL_ERR, "can't extract KeyID: %s\n", argv[2]);
1005 if (sscanf(argv[6], "%d", &uparam.kup_fsuid) != 1) {
1006 logmsg(LL_ERR, "can't extract UID: %s\n", argv[6]);
1010 if (sscanf(argv[7], "%d", &uparam.kup_fsgid) != 1) {
1011 logmsg(LL_ERR, "can't extract GID: %s\n", argv[7]);
1015 if (sscanf(argv[10], "%d", &sring) != 1) {
1016 logmsg(LL_ERR, "can't extract session keyring: %s\n", argv[10]);
1020 if (parse_callout_info(argv[5], &uparam)) {
1021 logmsg(LL_ERR, "can't extract callout info: %s\n", argv[5]);
1025 logmsg(LL_TRACE, "parsing parameters OK\n");
1030 mech = lgss_name2mech(uparam.kup_mech);
1032 logmsg(LL_ERR, "key %08x: unsupported mech: %s\n",
1033 keyid, uparam.kup_mech);
1037 if (lgss_mech_initialize(mech)) {
1038 logmsg(LL_ERR, "key %08x: can't initialize mech %s\n",
1039 keyid, mech->lmt_name);
1043 cred = lgss_create_cred(mech);
1045 logmsg(LL_ERR, "key %08x: can't create a new %s cred\n",
1046 keyid, mech->lmt_name);
1050 cred->lc_uid = uparam.kup_uid;
1051 cred->lc_root_flags |= uparam.kup_is_root ? LGSS_ROOT_CRED_ROOT : 0;
1052 cred->lc_root_flags |= uparam.kup_is_mdt ? LGSS_ROOT_CRED_MDT : 0;
1053 cred->lc_root_flags |= uparam.kup_is_ost ? LGSS_ROOT_CRED_OST : 0;
1054 cred->lc_tgt_nid = uparam.kup_nid;
1055 cred->lc_tgt_svc = uparam.kup_svc;
1056 cred->lc_tgt_uuid = uparam.kup_tgt;
1057 cred->lc_svc_type = uparam.kup_svc_type;
1058 cred->lc_self_nid = uparam.kup_selfnid;
1060 /* Is caller in different namespace? */
1061 snprintf(path, sizeof(path), "/proc/%d/ns/mnt", getpid());
1062 if (stat(path, &parent_ns)) {
1063 logmsg(LL_DEBUG, "cannot stat %s: %s\n", path, strerror(errno));
1065 snprintf(path, sizeof(path), "/proc/%d/ns/mnt", uparam.kup_pid);
1066 if (stat(path, &caller_ns))
1067 logmsg(LL_DEBUG, "cannot stat %s: %s\n",
1068 path, strerror(errno));
1069 else if (caller_ns.st_ino != parent_ns.st_ino)
1074 * if caller's namespace is different, fork a child and associate it
1075 * with caller's namespace to do credentials preparation
1078 logmsg(LL_TRACE, "caller's namespace is diffent\n");
1080 /* use pipes to pass info between child and parent processes */
1081 if (pipe(req_fd) == -1) {
1082 logmsg(LL_ERR, "key %08x: pipe failed: %s\n",
1083 keyid, strerror(errno));
1086 if (pipe(reply_fd) == -1) {
1087 logmsg(LL_ERR, "key %08x: pipe failed: %s\n",
1088 keyid, strerror(errno));
1094 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
1095 keyid, strerror(errno));
1098 } else if (child == 0) {
1100 /* child process: carry out credentials preparation
1101 * in caller's namespace */
1103 close(req_fd[0]); /* close unsed read end */
1105 close(reply_fd[1]); /* close unsed write end */
1108 if (associate_with_ns(path) != 0) {
1110 "failed to attach to pid %d namespace: "
1111 "%s\n", uparam.kup_pid, strerror(errno));
1115 logmsg(LL_TRACE, "working in namespace of pid %d\n",
1118 rc = prepare_and_instantiate(cred, keyid,
1121 /* send to parent the status of credentials preparation
1122 * and key instantiation */
1123 rc2 = send_to(req_fd[1], &rc, sizeof(rc));
1124 rc = (rc == 0 ? rc2 : rc);
1128 /* now do real gss negotiation
1129 * parent main process will not wait for us,
1130 * as it has to be done in the background */
1131 rc = lgssc_kr_negotiate(keyid, cred, &uparam,
1136 /* parent process: exchange info with child carrying out
1137 * credentials preparation */
1139 close(req_fd[1]); /* close unsed write end */
1141 close(reply_fd[0]); /* close unsed read end */
1144 /* get status of credentials preparation
1145 * and key instantiation */
1146 rc2 = receive_from(req_fd[0], &rc, sizeof(rc));
1147 if (rc2 != 0 || rc != 0) {
1148 logmsg(LL_ERR, "child failed preparing creds: "
1150 rc2 != 0 ? strerror(-rc2)
1156 * fork a child here to participate in gss negotiation,
1157 * as it has to be done in the background
1162 "key %08x: can't create child: %s\n",
1163 keyid, strerror(errno));
1166 } else if (child == 0) {
1167 struct lgssd_ioctl_param param;
1168 char outbuf[8192] = { 0 };
1169 void *gss_token = NULL;
1171 /* get ioctl buffer from child */
1172 rc = receive_from(req_fd[0], ¶m,
1177 gss_token = calloc(1, param.send_token_size);
1178 if (gss_token == NULL)
1181 /* get gss token from child */
1182 rc = receive_from(req_fd[0], gss_token,
1183 param.send_token_size);
1187 param.send_token = (char *)gss_token;
1188 param.reply_buf_size = sizeof(outbuf);
1189 param.reply_buf = outbuf;
1191 /* do ioctl in place of child process carrying
1192 * out credentials negotiation: as it runs in
1193 * a container, it might not be able to
1195 rc = gss_do_ioctl(¶m);
1199 /* send ioctl status to child */
1200 rc = send_to(reply_fd[1], ¶m.status,
1201 sizeof(param.status));
1204 /* send reply buffer to child */
1205 rc = send_to(reply_fd[1], outbuf,
1215 logmsg(LL_TRACE, "forked child %d\n", child);
1224 logmsg(LL_TRACE, "caller's namespace is the same\n");
1226 rc = prepare_and_instantiate(cred, keyid, uparam.kup_uid);
1231 * fork a child to do the real gss negotiation
1235 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
1236 keyid, strerror(errno));
1238 } else if (child == 0) {
1239 return lgssc_kr_negotiate(keyid, cred, &uparam,
1243 logmsg(LL_TRACE, "forked child %d\n", child);