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/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/utils/gss/lgss_keyring.c
34 * user-space upcall to create GSS context, using keyring interface to kernel
36 * Author: Eric Mei <ericm@clusterfs.com>
40 #include <sys/types.h>
51 #include <gssapi/gssapi.h>
54 #include <libcfs/util/param.h>
55 #include <libcfs/util/string.h>
57 #include "lgss_utils.h"
58 #include "write_bytes.h"
62 * gss target string of lustre service we are negotiating for
64 static char *g_service = NULL;
67 * all data about negotiation
69 struct lgss_nego_data {
70 uint32_t lnd_established:1;
77 gss_OID lnd_mech; /* mech OID */
78 gss_name_t lnd_svc_name; /* service name */
79 unsigned int lnd_req_flags; /* request flags */
80 gss_cred_id_t lnd_cred; /* credential */
81 gss_ctx_id_t lnd_ctx; /* session context */
82 gss_buffer_desc lnd_rmt_ctx; /* remote handle of context */
83 gss_buffer_desc lnd_ctx_token; /* context token for kernel */
84 uint32_t lnd_seq_win; /* sequence window */
91 * context creation response
93 struct lgss_init_res {
94 gss_buffer_desc gr_ctx; /* context handle */
95 unsigned int gr_major; /* major status */
96 unsigned int gr_minor; /* minor status */
97 unsigned int gr_win; /* sequence window */
98 gss_buffer_desc gr_token; /* token */
101 struct keyring_upcall_param {
110 uint64_t kup_selfnid;
114 unsigned int kup_is_root:1,
120 /****************************************
121 * child process: gss negotiation *
122 ****************************************/
124 static int send_to(int fd, const void *buf, size_t size)
128 sz = write(fd, buf, size);
130 logmsg(LL_ERR, "cannot send to GSS process: %s\n",
135 logmsg(LL_ERR, "short write sending to GSS process: %d/%d\n",
143 static int receive_from(int fd, void *buf, size_t size)
147 sz = read(fd, buf, size);
149 logmsg(LL_ERR, "cannot receive from GSS process: %s\n",
154 logmsg(LL_ERR, "short read receiving from GSS process: %d/%d\n",
162 static int gss_do_ioctl(struct lgssd_ioctl_param *param)
168 rc = cfs_get_param_paths(&path, "sptlrpc/gss/init_channel");
172 logmsg(LL_TRACE, "to open %s\n", path.gl_pathv[0]);
174 fd = open(path.gl_pathv[0], O_WRONLY);
176 logmsg(LL_ERR, "can't open %s\n", path.gl_pathv[0]);
181 logmsg(LL_TRACE, "to down-write\n");
183 ret = write(fd, param, sizeof(*param));
185 if (ret != sizeof(*param)) {
186 logmsg(LL_ERR, "lustre ioctl err: %s\n", strerror(errno));
191 cfs_free_param_data(&path);
195 int do_nego_rpc(struct lgss_nego_data *lnd,
196 gss_buffer_desc *gss_token,
197 struct lgss_init_res *gr,
198 int req_fd[2], int reply_fd[2])
200 struct lgssd_ioctl_param param;
203 char outbuf[8192] = { 0 };
207 logmsg(LL_TRACE, "start negotiation rpc\n");
209 pw = getpwuid(lnd->lnd_uid);
211 logmsg(LL_ERR, "no uid %u in local user database\n",
216 param.version = GSSD_INTERFACE_VERSION;
217 param.secid = lnd->lnd_secid;
218 param.uuid = lnd->lnd_uuid;
219 param.lustre_svc = lnd->lnd_lsvc;
220 param.uid = lnd->lnd_uid;
221 param.gid = pw->pw_gid;
222 param.send_token_size = gss_token->length;
223 param.send_token = (char *) gss_token->value;
225 if (req_fd[0] == -1 && reply_fd[0] == -1) {
226 /* we can do the ioctl directly */
227 param.reply_buf_size = sizeof(outbuf);
228 param.reply_buf = outbuf;
230 rc = gss_do_ioctl(¶m);
234 /* looks like we are running in a container,
235 * so we cannot do the ioctl ourselves: delegate to
236 * parent process running directly on host */
238 /* send ioctl buffer to parent */
239 rc = send_to(req_fd[1], ¶m, sizeof(param));
242 /* send gss token to parent */
243 rc = send_to(req_fd[1], gss_token->value, gss_token->length);
247 /* read ioctl status from parent */
248 rc = receive_from(reply_fd[0], ¶m.status,
249 sizeof(param.status));
253 if (param.status == 0) {
254 /* read reply buffer from parent */
255 rc = receive_from(reply_fd[0], outbuf, sizeof(outbuf));
261 logmsg(LL_TRACE, "do_nego_rpc: to parse reply\n");
263 logmsg(LL_ERR, "status: %ld (%s)\n",
264 param.status, strerror((int)(-param.status)));
266 /* kernel return -ETIMEDOUT means the rpc timedout, we should
267 * notify the caller to reinitiate the gss negotiation, by
268 * returning -ERESTART
270 if (param.status == -ETIMEDOUT)
277 p = (unsigned int *)outbuf;
283 gr->gr_ctx.length = *p++;
284 gr->gr_ctx.value = malloc(gr->gr_ctx.length);
285 if (gr->gr_ctx.value == NULL)
287 memcpy(gr->gr_ctx.value, p, gr->gr_ctx.length);
288 p += (((gr->gr_ctx.length + 3) & ~3) / 4);
290 gr->gr_token.length = *p++;
291 gr->gr_token.value = malloc(gr->gr_token.length);
292 if (gr->gr_token.value == NULL) {
293 free(gr->gr_ctx.value);
296 memcpy(gr->gr_token.value, p, gr->gr_token.length);
297 p += (((gr->gr_token.length + 3) & ~3) / 4);
299 logmsg(LL_DEBUG, "do_nego_rpc: receive handle len %zu, token len %zu, "
300 "res %d\n", gr->gr_ctx.length, gr->gr_token.length, res);
305 /* This is used by incomplete GSSAPI implementations that can't use
306 * gss_init_sec_context and will parse the token themselves (gssnull and sk).
307 * Callers should have cred->lc_mech_token pointing to a gss_buffer_desc
308 * token to send to the peer as part of the SEC_CTX_INIT operation. The return
309 * RPC's token with be in gr.gr_token which is validated using
310 * lgss_validate_cred. */
311 static int lgssc_negotiation_manual(struct lgss_nego_data *lnd,
312 struct lgss_cred *cred,
313 int req_fd[2], int reply_fd[2])
315 struct lgss_init_res gr;
319 logmsg(LL_TRACE, "starting gss negotation\n");
320 memset(&gr, 0, sizeof(gr));
322 lnd->lnd_rpc_err = do_nego_rpc(lnd, &cred->lc_mech_token, &gr,
324 if (lnd->lnd_rpc_err) {
325 logmsg(LL_ERR, "negotiation rpc error %d\n", lnd->lnd_rpc_err);
326 rc = lnd->lnd_rpc_err;
330 if (gr.gr_major == GSS_S_CONTINUE_NEEDED) {
334 } else if (gr.gr_major != GSS_S_COMPLETE) {
335 lnd->lnd_gss_err = gr.gr_major;
336 logmsg(LL_ERR, "negotiation gss error %x\n", lnd->lnd_gss_err);
341 if (gr.gr_ctx.length == 0 || gr.gr_token.length == 0) {
342 logmsg(LL_ERR, "zero length context or token received\n");
347 rc = lgss_validate_cred(cred, &gr.gr_token, &lnd->lnd_ctx_token);
349 logmsg(LL_ERR, "peer token failed validation\n");
353 lnd->lnd_established = 1;
354 lnd->lnd_seq_win = gr.gr_win;
355 lnd->lnd_rmt_ctx = gr.gr_ctx;
357 if (gr.gr_token.length != 0)
358 gss_release_buffer(&min_stat, &gr.gr_token);
360 logmsg(LL_DEBUG, "successfully negotiated a context\n");
364 if (gr.gr_ctx.length != 0)
365 gss_release_buffer(&min_stat, &gr.gr_ctx);
366 if (gr.gr_token.length != 0)
367 gss_release_buffer(&min_stat, &gr.gr_token);
373 * if return error, the lnd_rpc_err or lnd_gss_err is set.
375 static int lgssc_negotiation(struct lgss_nego_data *lnd, int req_fd[2],
378 struct lgss_init_res gr;
379 gss_buffer_desc *recv_tokenp, send_token;
380 OM_uint32 maj_stat, min_stat, ret_flags;
382 logmsg(LL_TRACE, "start gss negotiation\n");
384 /* GSS context establishment loop. */
385 memset(&gr, 0, sizeof(gr));
386 recv_tokenp = GSS_C_NO_BUFFER;
389 maj_stat = gss_init_sec_context(&min_stat,
398 NULL, /* used mech */
401 NULL); /* time rec */
403 if (recv_tokenp != GSS_C_NO_BUFFER) {
404 gss_release_buffer(&min_stat, &gr.gr_token);
405 recv_tokenp = GSS_C_NO_BUFFER;
408 if (maj_stat != GSS_S_COMPLETE &&
409 maj_stat != GSS_S_CONTINUE_NEEDED) {
410 lnd->lnd_gss_err = maj_stat;
412 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
413 "failed init context");
417 if (send_token.length != 0) {
418 memset(&gr, 0, sizeof(gr));
420 lnd->lnd_rpc_err = do_nego_rpc(lnd, &send_token, &gr,
422 gss_release_buffer(&min_stat, &send_token);
424 if (lnd->lnd_rpc_err) {
425 logmsg(LL_ERR, "negotiation rpc error: %d\n",
430 if (gr.gr_major != GSS_S_COMPLETE &&
431 gr.gr_major != GSS_S_CONTINUE_NEEDED) {
432 lnd->lnd_gss_err = gr.gr_major;
434 logmsg(LL_ERR, "negotiation gss error %x\n",
439 if (gr.gr_ctx.length != 0) {
440 if (lnd->lnd_rmt_ctx.value)
441 gss_release_buffer(&min_stat,
443 lnd->lnd_rmt_ctx = gr.gr_ctx;
446 if (gr.gr_token.length != 0) {
447 if (maj_stat != GSS_S_CONTINUE_NEEDED)
449 recv_tokenp = &gr.gr_token;
453 /* GSS_S_COMPLETE => check gss header verifier,
454 * usually checked in gss_validate
456 if (maj_stat == GSS_S_COMPLETE) {
457 lnd->lnd_established = 1;
458 lnd->lnd_seq_win = gr.gr_win;
463 /* End context negotiation loop. */
464 if (!lnd->lnd_established) {
465 if (gr.gr_token.length != 0)
466 gss_release_buffer(&min_stat, &gr.gr_token);
468 if (lnd->lnd_gss_err == GSS_S_COMPLETE)
469 lnd->lnd_rpc_err = -EACCES;
471 logmsg(LL_ERR, "context negotiation failed\n");
475 logmsg(LL_DEBUG, "successfully negotiated a context\n");
480 * if return error, the lnd_rpc_err or lnd_gss_err is set.
482 static int lgssc_init_nego_data(struct lgss_nego_data *lnd,
483 struct keyring_upcall_param *kup,
486 gss_buffer_desc sname;
487 OM_uint32 maj_stat, min_stat;
489 memset(lnd, 0, sizeof(*lnd));
491 lnd->lnd_secid = kup->kup_secid;
492 lnd->lnd_uid = kup->kup_uid;
493 lnd->lnd_lsvc = kup->kup_svc | mech << LUSTRE_GSS_MECH_SHIFT;
494 lnd->lnd_uuid = kup->kup_tgt;
496 lnd->lnd_established = 0;
497 lnd->lnd_svc_name = GSS_C_NO_NAME;
498 lnd->lnd_cred = GSS_C_NO_CREDENTIAL;
499 lnd->lnd_ctx = GSS_C_NO_CONTEXT;
500 lnd->lnd_rmt_ctx = (gss_buffer_desc) GSS_C_EMPTY_BUFFER;
501 lnd->lnd_seq_win = 0;
505 lnd->lnd_mech = (gss_OID)&krb5oid;
506 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
509 lnd->lnd_mech = (gss_OID)&nulloid;
511 #ifdef HAVE_OPENSSL_SSK
513 lnd->lnd_mech = (gss_OID)&skoid;
514 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
518 logmsg(LL_ERR, "invalid mech: %d\n", mech);
519 lnd->lnd_rpc_err = -EACCES;
523 sname.value = g_service;
524 sname.length = strlen(g_service);
526 maj_stat = gss_import_name(&min_stat, &sname,
527 (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
529 if (maj_stat != GSS_S_COMPLETE) {
530 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
531 "can't import svc name");
532 lnd->lnd_gss_err = maj_stat;
539 void lgssc_fini_nego_data(struct lgss_nego_data *lnd)
541 OM_uint32 maj_stat, min_stat;
543 if (lnd->lnd_svc_name != GSS_C_NO_NAME) {
544 maj_stat = gss_release_name(&min_stat, &lnd->lnd_svc_name);
545 if (maj_stat != GSS_S_COMPLETE)
546 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
547 "can't release service name");
550 if (lnd->lnd_cred != GSS_C_NO_CREDENTIAL) {
551 maj_stat = gss_release_cred(&min_stat, &lnd->lnd_cred);
552 if (maj_stat != GSS_S_COMPLETE)
553 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
554 "can't release credential");
559 int error_kernel_key(key_serial_t keyid, int rpc_error, int gss_error)
565 logmsg(LL_TRACE, "revoking kernel key %08x\n", keyid);
568 end = buf + sizeof(buf);
570 WRITE_BYTES(&p, end, seqwin);
571 WRITE_BYTES(&p, end, rpc_error);
572 WRITE_BYTES(&p, end, gss_error);
575 if (keyctl_update(keyid, buf, p - buf)) {
576 if (errno != EAGAIN) {
577 logmsg(LL_ERR, "revoke key %08x: %s\n",
578 keyid, strerror(errno));
582 logmsg(LL_WARN, "key %08x: revoking too soon, try again\n",
588 logmsg(LL_INFO, "key %08x: revoked\n", keyid);
593 int update_kernel_key(key_serial_t keyid,
594 struct lgss_nego_data *lnd,
595 gss_buffer_desc *ctx_token)
597 char *buf = NULL, *p = NULL, *end = NULL;
598 unsigned int buf_size = 0;
601 logmsg(LL_TRACE, "updating kernel key %08x\n", keyid);
603 buf_size = sizeof(lnd->lnd_seq_win) +
604 sizeof(lnd->lnd_rmt_ctx.length) + lnd->lnd_rmt_ctx.length +
605 sizeof(ctx_token->length) + ctx_token->length;
606 buf = malloc(buf_size);
608 logmsg(LL_ERR, "key %08x: can't alloc update buf: size %d\n",
614 end = buf + buf_size;
617 if (WRITE_BYTES(&p, end, lnd->lnd_seq_win))
619 if (write_buffer(&p, end, &lnd->lnd_rmt_ctx))
621 if (write_buffer(&p, end, ctx_token))
625 if (keyctl_update(keyid, buf, p - buf)) {
626 if (errno != EAGAIN) {
627 logmsg(LL_ERR, "update key %08x: %s\n",
628 keyid, strerror(errno));
632 logmsg(LL_DEBUG, "key %08x: updating too soon, try again\n",
639 logmsg(LL_DEBUG, "key %08x: updated\n", keyid);
645 static int lgssc_kr_negotiate_krb(key_serial_t keyid, struct lgss_cred *cred,
646 struct keyring_upcall_param *kup,
647 int req_fd[2], int reply_fd[2])
649 struct lgss_nego_data lnd;
653 memset(&lnd, 0, sizeof(lnd));
655 if (lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid)) {
656 logmsg(LL_ERR, "key %08x: failed to construct service "
658 error_kernel_key(keyid, -EACCES, 0);
662 if (lgss_using_cred(cred)) {
663 logmsg(LL_ERR, "key %08x: can't using cred\n", keyid);
664 error_kernel_key(keyid, -EACCES, 0);
668 if (lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n)) {
669 logmsg(LL_ERR, "key %08x: failed to initialize "
670 "negotiation data\n", keyid);
671 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
675 rc = lgssc_negotiation(&lnd, req_fd, reply_fd);
677 logmsg(LL_ERR, "key %08x: failed to negotiation\n", keyid);
678 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
682 rc = serialize_context_for_kernel(lnd.lnd_ctx, &lnd.lnd_ctx_token,
685 logmsg(LL_ERR, "key %08x: failed to export context\n", keyid);
686 error_kernel_key(keyid, rc, lnd.lnd_gss_err);
690 rc = update_kernel_key(keyid, &lnd, &lnd.lnd_ctx_token);
695 logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
696 keyid, kup->kup_uid);
698 if (lnd.lnd_ctx_token.length != 0)
699 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
701 lgssc_fini_nego_data(&lnd);
704 lgss_release_cred(cred);
708 static int lgssc_kr_negotiate_manual(key_serial_t keyid, struct lgss_cred *cred,
709 struct keyring_upcall_param *kup,
710 int req_fd[2], int reply_fd[2])
712 struct lgss_nego_data lnd;
717 memset(&lnd, 0, sizeof(lnd));
719 rc = lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid);
721 logmsg(LL_ERR, "key %08x: failed to construct service "
723 error_kernel_key(keyid, -EACCES, 0);
727 rc = lgss_using_cred(cred);
729 logmsg(LL_ERR, "key %08x: can't use cred\n", keyid);
730 error_kernel_key(keyid, -EACCES, 0);
734 rc = lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n);
736 logmsg(LL_ERR, "key %08x: failed to initialize "
737 "negotiation data\n", keyid);
738 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
743 * Handles the negotiation but then calls lgss_validate to make sure
744 * the token is valid. It also populates the lnd_ctx_token for the
745 * update to the kernel key
747 rc = lgssc_negotiation_manual(&lnd, cred, req_fd, reply_fd);
749 logmsg(LL_ERR, "Failed negotiation must retry\n");
753 logmsg(LL_ERR, "key %08x: failed to negotiate\n", keyid);
754 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
758 rc = update_kernel_key(keyid, &lnd, &lnd.lnd_ctx_token);
762 logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
763 keyid, kup->kup_uid);
765 if (lnd.lnd_ctx_token.length != 0)
766 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
768 lgssc_fini_nego_data(&lnd);
771 lgss_release_cred(cred);
776 * note we inherited assumed authority from parent process
778 static int lgssc_kr_negotiate(key_serial_t keyid, struct lgss_cred *cred,
779 struct keyring_upcall_param *kup,
780 int req_fd[2], int reply_fd[2])
784 logmsg(LL_TRACE, "child start on behalf of key %08x: "
785 "cred %p, uid %u, svc %u, nid %"PRIx64", uids: %u:%u/%u:%u\n",
786 keyid, cred, cred->lc_uid, cred->lc_tgt_svc, cred->lc_tgt_nid,
787 kup->kup_uid, kup->kup_gid, kup->kup_fsuid, kup->kup_fsgid);
789 switch (cred->lc_mech->lmt_mech_n) {
792 rc = lgssc_kr_negotiate_manual(keyid, cred, kup,
797 rc = lgssc_kr_negotiate_krb(keyid, cred, kup, req_fd, reply_fd);
805 * call out info format: s[:s]...
807 * [1]: mech_name (string)
810 * [4]: flags (string) FMT: r-root; m-mdt; o-ost
811 * [5]: svc type (char)
812 * [6]: lustre_svc (int)
813 * [7]: target_nid (uint64)
814 * [8]: target_uuid (string)
815 * [9]: self_nid (uint64)
818 static int parse_callout_info(const char *coinfo,
819 struct keyring_upcall_param *uparam)
821 const int nargs = 11;
828 length = strlen(coinfo) + 1;
830 logmsg(LL_ERR, "coinfo too long\n");
833 memcpy(buf, coinfo, length);
835 for (i = 0; i < nargs - 1; i++) {
836 pos = strchr(string, ':');
838 logmsg(LL_ERR, "short of components\n");
848 logmsg(LL_TRACE, "components: %s,%s,%s,%s,%s,%c,%s,%s,%s,%s,%s\n",
849 data[0], data[1], data[2], data[3], data[4], data[5][0],
850 data[6], data[7], data[8], data[9], data[10]);
852 uparam->kup_secid = strtol(data[0], NULL, 0);
853 snprintf(uparam->kup_mech, sizeof(uparam->kup_mech), "%s", data[1]);
854 uparam->kup_uid = strtol(data[2], NULL, 0);
855 uparam->kup_gid = strtol(data[3], NULL, 0);
856 if (strchr(data[4], 'r'))
857 uparam->kup_is_root = 1;
858 if (strchr(data[4], 'm'))
859 uparam->kup_is_mdt = 1;
860 if (strchr(data[4], 'o'))
861 uparam->kup_is_ost = 1;
862 uparam->kup_svc_type = data[5][0];
863 uparam->kup_svc = strtol(data[6], NULL, 0);
864 uparam->kup_nid = strtoll(data[7], NULL, 0);
865 snprintf(uparam->kup_tgt, sizeof(uparam->kup_tgt), "%s", data[8]);
866 uparam->kup_selfnid = strtoll(data[9], NULL, 0);
867 uparam->kup_pid = strtol(data[10], NULL, 0);
869 logmsg(LL_DEBUG, "parse call out info: secid %d, mech %s, ugid %u:%u, "
870 "is_root %d, is_mdt %d, is_ost %d, svc type %c, svc %d, "
871 "nid 0x%"PRIx64", tgt %s, self nid 0x%"PRIx64", pid %d\n",
872 uparam->kup_secid, uparam->kup_mech,
873 uparam->kup_uid, uparam->kup_gid,
874 uparam->kup_is_root, uparam->kup_is_mdt, uparam->kup_is_ost,
875 uparam->kup_svc_type, uparam->kup_svc, uparam->kup_nid,
876 uparam->kup_tgt, uparam->kup_selfnid, uparam->kup_pid);
880 static void set_log_level()
886 if (cfs_get_param_paths(&path,
887 "sptlrpc/gss/lgss_keyring/debug_level") != 0)
889 file = fopen(path.gl_pathv[0], "r");
891 cfs_free_param_data(&path);
895 if (fscanf(file, "%u", &level) != 1)
901 lgss_set_loglevel(level);
903 cfs_free_param_data(&path);
907 static int associate_with_ns(char *path)
912 fd = open(path, O_RDONLY);
921 #endif /* HAVE_SETNS */
924 static int prepare_and_instantiate(struct lgss_cred *cred, key_serial_t keyid,
927 key_serial_t inst_keyring;
929 if (lgss_prepare_cred(cred)) {
930 logmsg(LL_ERR, "key %08x: failed to prepare credentials "
931 "for user %d\n", keyid, uid);
935 /* pre initialize the key. note the keyring linked to is actually of the
936 * original requesting process, not _this_ upcall process. if it's for
937 * root user, don't link to any keyrings because we want fully control
938 * on it, and share it among all root sessions; otherswise link to
941 if (cred->lc_root_flags != 0)
944 inst_keyring = KEY_SPEC_SESSION_KEYRING;
946 if (keyctl_instantiate(keyid, NULL, 0, inst_keyring)) {
947 logmsg(LL_ERR, "instantiate key %08x: %s\n",
948 keyid, strerror(errno));
952 logmsg(LL_TRACE, "instantiated kernel key %08x\n", keyid);
957 /****************************************
959 ****************************************/
961 int main(int argc, char *argv[])
963 struct keyring_upcall_param uparam;
967 int req_fd[2] = { -1, -1 };
968 int reply_fd[2] = { -1, -1 };
969 struct lgss_mech_type *mech;
970 struct lgss_cred *cred;
971 char path[PATH_MAX] = "";
975 struct stat parent_ns = { .st_ino = 0 };
976 struct stat caller_ns = { .st_ino = 0 };
981 logmsg(LL_TRACE, "start parsing parameters\n");
983 * parse & sanity check upcall parameters
984 * expected to be called with:
988 * [4]: key description
992 * [8]: thread keyring
993 * [9]: process keyring
994 * [10]: session keyring
996 if (argc != 10 + 1) {
997 logmsg(LL_ERR, "invalid parameter number %d\n", argc);
1001 logmsg(LL_INFO, "key %s, desc %s, ugid %s:%s, sring %s, coinfo %s\n",
1002 argv[2], argv[4], argv[6], argv[7], argv[10], argv[5]);
1004 memset(&uparam, 0, sizeof(uparam));
1006 if (strcmp(argv[1], "create") != 0) {
1007 logmsg(LL_ERR, "invalid OP %s\n", argv[1]);
1011 if (sscanf(argv[2], "%d", &keyid) != 1) {
1012 logmsg(LL_ERR, "can't extract KeyID: %s\n", argv[2]);
1016 if (sscanf(argv[6], "%d", &uparam.kup_fsuid) != 1) {
1017 logmsg(LL_ERR, "can't extract UID: %s\n", argv[6]);
1021 if (sscanf(argv[7], "%d", &uparam.kup_fsgid) != 1) {
1022 logmsg(LL_ERR, "can't extract GID: %s\n", argv[7]);
1026 if (sscanf(argv[10], "%d", &sring) != 1) {
1027 logmsg(LL_ERR, "can't extract session keyring: %s\n", argv[10]);
1031 if (parse_callout_info(argv[5], &uparam)) {
1032 logmsg(LL_ERR, "can't extract callout info: %s\n", argv[5]);
1036 logmsg(LL_TRACE, "parsing parameters OK\n");
1041 mech = lgss_name2mech(uparam.kup_mech);
1043 logmsg(LL_ERR, "key %08x: unsupported mech: %s\n",
1044 keyid, uparam.kup_mech);
1048 if (lgss_mech_initialize(mech)) {
1049 logmsg(LL_ERR, "key %08x: can't initialize mech %s\n",
1050 keyid, mech->lmt_name);
1054 cred = lgss_create_cred(mech);
1056 logmsg(LL_ERR, "key %08x: can't create a new %s cred\n",
1057 keyid, mech->lmt_name);
1061 cred->lc_uid = uparam.kup_uid;
1062 cred->lc_root_flags |= uparam.kup_is_root ? LGSS_ROOT_CRED_ROOT : 0;
1063 cred->lc_root_flags |= uparam.kup_is_mdt ? LGSS_ROOT_CRED_MDT : 0;
1064 cred->lc_root_flags |= uparam.kup_is_ost ? LGSS_ROOT_CRED_OST : 0;
1065 cred->lc_tgt_nid = uparam.kup_nid;
1066 cred->lc_tgt_svc = uparam.kup_svc;
1067 cred->lc_tgt_uuid = uparam.kup_tgt;
1068 cred->lc_svc_type = uparam.kup_svc_type;
1069 cred->lc_self_nid = uparam.kup_selfnid;
1072 /* Is caller in different namespace? */
1073 snprintf(path, sizeof(path), "/proc/%d/ns/mnt", getpid());
1074 if (stat(path, &parent_ns))
1075 logmsg(LL_ERR, "cannot stat %s: %s\n", path, strerror(errno));
1076 snprintf(path, sizeof(path), "/proc/%d/ns/mnt", uparam.kup_pid);
1077 if (stat(path, &caller_ns))
1078 logmsg(LL_ERR, "cannot stat %s: %s\n", path, strerror(errno));
1079 if (caller_ns.st_ino != parent_ns.st_ino) {
1082 #endif /* HAVE_SETNS */
1085 * if caller's namespace is different, fork a child and associate it
1086 * with caller's namespace to do credentials preparation
1089 logmsg(LL_TRACE, "caller's namespace is diffent\n");
1091 /* use pipes to pass info between child and parent processes */
1092 if (pipe(req_fd) == -1) {
1093 logmsg(LL_ERR, "key %08x: pipe failed: %s\n",
1094 keyid, strerror(errno));
1097 if (pipe(reply_fd) == -1) {
1098 logmsg(LL_ERR, "key %08x: pipe failed: %s\n",
1099 keyid, strerror(errno));
1105 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
1106 keyid, strerror(errno));
1109 } else if (child == 0) {
1111 /* child process: carry out credentials preparation
1112 * in caller's namespace */
1114 close(req_fd[0]); /* close unsed read end */
1116 close(reply_fd[1]); /* close unsed write end */
1119 if (associate_with_ns(path) != 0) {
1121 "failed to attach to pid %d namespace: "
1122 "%s\n", uparam.kup_pid, strerror(errno));
1126 logmsg(LL_TRACE, "working in namespace of pid %d\n",
1129 rc = prepare_and_instantiate(cred, keyid,
1132 /* send to parent the status of credentials preparation
1133 * and key instantiation */
1134 rc2 = send_to(req_fd[1], &rc, sizeof(rc));
1135 rc = (rc == 0 ? rc2 : rc);
1139 /* now do real gss negotiation
1140 * parent main process will not wait for us,
1141 * as it has to be done in the background */
1142 rc = lgssc_kr_negotiate(keyid, cred, &uparam,
1147 /* parent process: exchange info with child carrying out
1148 * credentials preparation */
1150 close(req_fd[1]); /* close unsed write end */
1152 close(reply_fd[0]); /* close unsed read end */
1155 /* get status of credentials preparation
1156 * and key instantiation */
1157 rc2 = receive_from(req_fd[0], &rc, sizeof(rc));
1158 if (rc2 != 0 || rc != 0) {
1159 logmsg(LL_ERR, "child failed preparing creds: "
1161 rc2 != 0 ? strerror(-rc2)
1167 * fork a child here to participate in gss negotiation,
1168 * as it has to be done in the background
1173 "key %08x: can't create child: %s\n",
1174 keyid, strerror(errno));
1177 } else if (child == 0) {
1178 struct lgssd_ioctl_param param;
1179 char outbuf[8192] = { 0 };
1180 void *gss_token = NULL;
1182 /* get ioctl buffer from child */
1183 rc = receive_from(req_fd[0], ¶m,
1188 gss_token = calloc(1, param.send_token_size);
1189 if (gss_token == NULL)
1192 /* get gss token from child */
1193 rc = receive_from(req_fd[0], gss_token,
1194 param.send_token_size);
1198 param.send_token = (char *)gss_token;
1199 param.reply_buf_size = sizeof(outbuf);
1200 param.reply_buf = outbuf;
1202 /* do ioctl in place of child process carrying
1203 * out credentials negotiation: as it runs in
1204 * a container, it might not be able to
1206 rc = gss_do_ioctl(¶m);
1210 /* send ioctl status to child */
1211 rc = send_to(reply_fd[1], ¶m.status,
1212 sizeof(param.status));
1215 /* send reply buffer to child */
1216 rc = send_to(reply_fd[1], outbuf,
1226 logmsg(LL_TRACE, "forked child %d\n", child);
1235 logmsg(LL_TRACE, "caller's namespace is the same\n");
1237 rc = prepare_and_instantiate(cred, keyid, uparam.kup_uid);
1242 * fork a child to do the real gss negotiation
1246 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
1247 keyid, strerror(errno));
1249 } else if (child == 0) {
1250 return lgssc_kr_negotiate(keyid, cred, &uparam,
1254 logmsg(LL_TRACE, "forked child %d\n", child);