lustre/utils/gss/lgss_keyring.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   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.
   9  *
  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).
  15  *
  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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/utils/gss/lgss_keyring.c
  37  *
  38  * user-space upcall to create GSS context, using keyring interface to kernel
  39  *
  40  * Author: Eric Mei <ericm@clusterfs.com>
  41  */
  42
  43 #include <unistd.h>
  44 #include <stdlib.h>
  45 #include <stdio.h>
  46 #include <fcntl.h>
  47 #include <string.h>
  48 #include <errno.h>
  49 #include <pwd.h>
  50 #include <keyutils.h>
  51 #include <gssapi/gssapi.h>
  52
  53 #include <libcfs/util/string.h>
  54 #include "lsupport.h"
  55 #include "lgss_utils.h"
  56 #include "write_bytes.h"
  57 #include "context.h"
  58
  59 /*
  60  * gss target string of lustre service we are negotiating for
  61  */
  62 static char *g_service = NULL;
  63
  64 /*
  65  * all data about negotiation
  66  */
  67 struct lgss_nego_data {
  68         uint32_t        lnd_established:1;
  69
  70         int             lnd_secid;
  71         uint32_t        lnd_uid;
  72         uint32_t        lnd_lsvc;
  73         char           *lnd_uuid;
  74
  75         gss_OID         lnd_mech;               /* mech OID */
  76         gss_name_t      lnd_svc_name;           /* service name */
  77         u_int           lnd_req_flags;          /* request flags */
  78         gss_cred_id_t   lnd_cred;               /* credential */
  79         gss_ctx_id_t    lnd_ctx;                /* session context */
  80         gss_buffer_desc lnd_rmt_ctx;            /* remote handle of context */
  81         uint32_t        lnd_seq_win;            /* sequence window */
  82
  83         int             lnd_rpc_err;
  84         int             lnd_gss_err;
  85 };
  86
  87 /*
  88  * context creation response
  89  */
  90 struct lgss_init_res {
  91         gss_buffer_desc gr_ctx;         /* context handle */
  92         u_int           gr_major;       /* major status */
  93         u_int           gr_minor;       /* minor status */
  94         u_int           gr_win;         /* sequence window */
  95         gss_buffer_desc gr_token;       /* token */
  96 };
  97
  98 struct keyring_upcall_param {
  99         uint32_t        kup_ver;
 100         uint32_t        kup_secid;
 101         uint32_t        kup_uid;
 102         uint32_t        kup_fsuid;
 103         uint32_t        kup_gid;
 104         uint32_t        kup_fsgid;
 105         uint32_t        kup_svc;
 106         uint64_t        kup_nid;
 107         char            kup_tgt[64];
 108         char            kup_mech[16];
 109         unsigned int    kup_is_root:1,
 110                         kup_is_mdt:1,
 111                         kup_is_ost:1;
 112 };
 113
 114 /****************************************
 115  * child process: gss negotiation       *
 116  ****************************************/
 117
 118 #define INIT_CHANNEL    "/proc/fs/lustre/sptlrpc/gss/init_channel"
 119
 120 int do_nego_rpc(struct lgss_nego_data *lnd,
 121                 gss_buffer_desc *gss_token,
 122                 struct lgss_init_res *gr)
 123 {
 124         struct lgssd_ioctl_param  param;
 125         struct passwd            *pw;
 126         int                       fd, ret, res;
 127         char                      outbuf[8192];
 128         unsigned int             *p;
 129
 130         logmsg(LL_TRACE, "start negotiation rpc\n");
 131
 132         pw = getpwuid(lnd->lnd_uid);
 133         if (!pw) {
 134                 logmsg(LL_ERR, "no uid %u in local user database\n",
 135                        lnd->lnd_uid);
 136                 return -EACCES;
 137         }
 138
 139         param.version = GSSD_INTERFACE_VERSION;
 140         param.secid = lnd->lnd_secid;
 141         param.uuid = lnd->lnd_uuid;
 142         param.lustre_svc = lnd->lnd_lsvc;
 143         param.uid = lnd->lnd_uid;
 144         param.gid = pw->pw_gid;
 145         param.send_token_size = gss_token->length;
 146         param.send_token = (char *) gss_token->value;
 147         param.reply_buf_size = sizeof(outbuf);
 148         param.reply_buf = outbuf;
 149
 150         logmsg(LL_TRACE, "to open " INIT_CHANNEL "\n");
 151
 152         fd = open(INIT_CHANNEL, O_WRONLY);
 153         if (fd < 0) {
 154                 logmsg(LL_ERR, "can't open " INIT_CHANNEL "\n");
 155                 return -EACCES;
 156         }
 157
 158         logmsg(LL_TRACE, "to down-write\n");
 159
 160         ret = write(fd, &param, sizeof(param));
 161         if (ret != sizeof(param)) {
 162                 logmsg(LL_ERR, "lustre ioctl err: %d\n", strerror(errno));
 163                 close(fd);
 164                 return -EACCES;
 165         }
 166         close(fd);
 167
 168         logmsg(LL_TRACE, "do_nego_rpc: to parse reply\n");
 169         if (param.status) {
 170                 logmsg(LL_ERR, "status: %d (%s)\n",
 171                        param.status, strerror((int)param.status));
 172
 173                 /* kernel return -ETIMEDOUT means the rpc timedout, we should
 174                  * notify the caller to reinitiate the gss negotiation, by
 175                  * returning -ERESTART
 176                  */
 177                 if (param.status == -ETIMEDOUT)
 178                         return -ERESTART;
 179                 else
 180                         return param.status;
 181         }
 182
 183         p = (unsigned int *)outbuf;
 184         res = *p++;
 185         gr->gr_major = *p++;
 186         gr->gr_minor = *p++;
 187         gr->gr_win = *p++;
 188
 189         gr->gr_ctx.length = *p++;
 190         gr->gr_ctx.value = malloc(gr->gr_ctx.length);
 191         memcpy(gr->gr_ctx.value, p, gr->gr_ctx.length);
 192         p += (((gr->gr_ctx.length + 3) & ~3) / 4);
 193
 194         gr->gr_token.length = *p++;
 195         gr->gr_token.value = malloc(gr->gr_token.length);
 196         memcpy(gr->gr_token.value, p, gr->gr_token.length);
 197         p += (((gr->gr_token.length + 3) & ~3) / 4);
 198
 199         logmsg(LL_DEBUG, "do_nego_rpc: receive handle len %d, token len %d, " \
 200                "res %d\n", gr->gr_ctx.length, gr->gr_token.length, res);
 201         return 0;
 202 }
 203
 204 /*
 205  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 206  */
 207 static int lgssc_negotiation(struct lgss_nego_data *lnd)
 208 {
 209         struct lgss_init_res    gr;
 210         gss_buffer_desc        *recv_tokenp, send_token;
 211         OM_uint32               maj_stat, min_stat, ret_flags;
 212
 213         logmsg(LL_TRACE, "start gss negotiation\n");
 214
 215         /* GSS context establishment loop. */
 216         memset(&gr, 0, sizeof(gr));
 217         recv_tokenp = GSS_C_NO_BUFFER;
 218
 219         for (;;) {
 220                 maj_stat = gss_init_sec_context(&min_stat,
 221                                                 lnd->lnd_cred,
 222                                                 &lnd->lnd_ctx,
 223                                                 lnd->lnd_svc_name,
 224                                                 lnd->lnd_mech,
 225                                                 lnd->lnd_req_flags,
 226                                                 0,            /* time req */
 227                                                 NULL,         /* channel */
 228                                                 recv_tokenp,
 229                                                 NULL,         /* used mech */
 230                                                 &send_token,
 231                                                 &ret_flags,
 232                                                 NULL);        /* time rec */
 233
 234                 if (recv_tokenp != GSS_C_NO_BUFFER) {
 235                         gss_release_buffer(&min_stat, &gr.gr_token);
 236                         recv_tokenp = GSS_C_NO_BUFFER;
 237                 }
 238
 239                 if (maj_stat != GSS_S_COMPLETE &&
 240                     maj_stat != GSS_S_CONTINUE_NEEDED) {
 241                         lnd->lnd_gss_err = maj_stat;
 242
 243                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 244                                    "failed init context");
 245                         break;
 246                 }
 247
 248                 if (send_token.length != 0) {
 249                         memset(&gr, 0, sizeof(gr));
 250
 251                         lnd->lnd_rpc_err = do_nego_rpc(lnd, &send_token, &gr);
 252                         gss_release_buffer(&min_stat, &send_token);
 253
 254                         if (lnd->lnd_rpc_err) {
 255                                 logmsg(LL_ERR, "negotiation rpc error: %d\n",
 256                                        lnd->lnd_rpc_err);
 257                                 return -1;
 258                         }
 259
 260                         if (gr.gr_major != GSS_S_COMPLETE &&
 261                             gr.gr_major != GSS_S_CONTINUE_NEEDED) {
 262                                 lnd->lnd_gss_err = gr.gr_major;
 263
 264                                 logmsg(LL_ERR, "negotiation gss error %x\n",
 265                                        lnd->lnd_gss_err);
 266                                 return -1;
 267                         }
 268
 269                         if (gr.gr_ctx.length != 0) {
 270                                 if (lnd->lnd_rmt_ctx.value)
 271                                         gss_release_buffer(&min_stat,
 272                                                            &lnd->lnd_rmt_ctx);
 273                                 lnd->lnd_rmt_ctx = gr.gr_ctx;
 274                         }
 275
 276                         if (gr.gr_token.length != 0) {
 277                                 if (maj_stat != GSS_S_CONTINUE_NEEDED)
 278                                         break;
 279                                 recv_tokenp = &gr.gr_token;
 280                         }
 281                 }
 282
 283                 /* GSS_S_COMPLETE => check gss header verifier,
 284                  * usually checked in gss_validate
 285                  */
 286                 if (maj_stat == GSS_S_COMPLETE) {
 287                         lnd->lnd_established = 1;
 288                         lnd->lnd_seq_win = gr.gr_win;
 289                         break;
 290                 }
 291         }
 292
 293         /* End context negotiation loop. */
 294         if (!lnd->lnd_established) {
 295                 if (gr.gr_token.length != 0)
 296                         gss_release_buffer(&min_stat, &gr.gr_token);
 297
 298                 if (lnd->lnd_gss_err == GSS_S_COMPLETE)
 299                         lnd->lnd_rpc_err = -EACCES;
 300
 301                 logmsg(LL_ERR, "context negotiation failed\n");
 302                 return -1;
 303         }
 304
 305         logmsg(LL_DEBUG, "successfully negotiated a context\n");
 306         return 0;
 307 }
 308
 309 /*
 310  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 311  */
 312 static int lgssc_init_nego_data(struct lgss_nego_data *lnd,
 313                                 struct keyring_upcall_param *kup,
 314                                 lgss_mech_t mech)
 315 {
 316         gss_buffer_desc         sname;
 317         OM_uint32               maj_stat, min_stat;
 318
 319         memset(lnd, 0, sizeof(*lnd));
 320
 321         lnd->lnd_secid = kup->kup_secid;
 322         lnd->lnd_uid = kup->kup_uid;
 323         lnd->lnd_lsvc = kup->kup_svc;
 324         lnd->lnd_uuid = kup->kup_tgt;
 325
 326         lnd->lnd_established = 0;
 327         lnd->lnd_svc_name = GSS_C_NO_NAME;
 328         lnd->lnd_cred = GSS_C_NO_CREDENTIAL;
 329         lnd->lnd_ctx = GSS_C_NO_CONTEXT;
 330         lnd->lnd_rmt_ctx = (gss_buffer_desc) GSS_C_EMPTY_BUFFER;
 331         lnd->lnd_seq_win = 0;
 332
 333         switch (mech) {
 334         case LGSS_MECH_KRB5:
 335                 lnd->lnd_mech = (gss_OID) &krb5oid;
 336                 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
 337                 break;
 338         default:
 339                 logmsg(LL_ERR, "invalid mech: %d\n", mech);
 340                 lnd->lnd_rpc_err = -EACCES;
 341                 return -1;
 342         }
 343
 344         sname.value = g_service;
 345         sname.length = strlen(g_service);
 346
 347         maj_stat = gss_import_name(&min_stat, &sname,
 348                                    (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
 349                                    &lnd->lnd_svc_name);
 350         if (maj_stat != GSS_S_COMPLETE) {
 351                 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 352                            "can't import svc name");
 353                 lnd->lnd_gss_err = maj_stat;
 354                 return -1;
 355         }
 356
 357         return 0;
 358 }
 359
 360 void lgssc_fini_nego_data(struct lgss_nego_data *lnd)
 361 {
 362         OM_uint32       maj_stat, min_stat;
 363
 364         if (lnd->lnd_svc_name != GSS_C_NO_NAME) {
 365                 maj_stat = gss_release_name(&min_stat, &lnd->lnd_svc_name);
 366                 if (maj_stat != GSS_S_COMPLETE)
 367                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 368                                    "can't release service name");
 369         }
 370
 371         if (lnd->lnd_cred != GSS_C_NO_CREDENTIAL) {
 372                 maj_stat = gss_release_cred(&min_stat, &lnd->lnd_cred);
 373                 if (maj_stat != GSS_S_COMPLETE)
 374                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 375                                    "can't release credential");
 376         }
 377 }
 378
 379 static
 380 int error_kernel_key(key_serial_t keyid, int rpc_error, int gss_error)
 381 {
 382         int      seqwin = 0;
 383         char     buf[32];
 384         char    *p, *end;
 385
 386         logmsg(LL_TRACE, "revoking kernel key %08x\n", keyid);
 387
 388         p = buf;
 389         end = buf + sizeof(buf);
 390
 391         WRITE_BYTES(&p, end, seqwin);
 392         WRITE_BYTES(&p, end, rpc_error);
 393         WRITE_BYTES(&p, end, gss_error);
 394
 395 again:
 396         if (keyctl_update(keyid, buf, p - buf)) {
 397                 if (errno != EAGAIN) {
 398                         logmsg(LL_ERR, "revoke key %08x: %s\n",
 399                                keyid, strerror(errno));
 400                         return -1;
 401                 }
 402
 403                 logmsg(LL_WARN, "key %08x: revoking too soon, try again\n",
 404                        keyid);
 405                 sleep(2);
 406                 goto again;
 407         }
 408
 409         logmsg(LL_INFO, "key %08x: revoked\n", keyid);
 410         return 0;
 411 }
 412
 413 static
 414 int update_kernel_key(key_serial_t keyid,
 415                       struct lgss_nego_data *lnd,
 416                       gss_buffer_desc *ctx_token)
 417 {
 418         char        *buf = NULL, *p = NULL, *end = NULL;
 419         unsigned int buf_size = 0;
 420         int          rc;
 421
 422         logmsg(LL_TRACE, "updating kernel key %08x\n", keyid);
 423
 424         buf_size = sizeof(lnd->lnd_seq_win) +
 425                    sizeof(lnd->lnd_rmt_ctx.length) + lnd->lnd_rmt_ctx.length +
 426                    sizeof(ctx_token->length) + ctx_token->length;
 427         buf = malloc(buf_size);
 428         if (buf == NULL) {
 429                 logmsg(LL_ERR, "key %08x: can't alloc update buf: size %d\n",
 430                        keyid, buf_size);
 431                 return 1;
 432         }
 433
 434         p = buf;
 435         end = buf + buf_size;
 436         rc = -1;
 437
 438         if (WRITE_BYTES(&p, end, lnd->lnd_seq_win))
 439                 goto out;
 440         if (write_buffer(&p, end, &lnd->lnd_rmt_ctx))
 441                 goto out;
 442         if (write_buffer(&p, end, ctx_token))
 443                 goto out;
 444
 445 again:
 446         if (keyctl_update(keyid, buf, p - buf)) {
 447                 if (errno != EAGAIN) {
 448                         logmsg(LL_ERR, "update key %08x: %s\n",
 449                                keyid, strerror(errno));
 450                         goto out;
 451                 }
 452
 453                 logmsg(LL_DEBUG, "key %08x: updating too soon, try again\n",
 454                        keyid);
 455                 sleep(2);
 456                 goto again;
 457         }
 458
 459         rc = 0;
 460         logmsg(LL_DEBUG, "key %08x: updated\n", keyid);
 461 out:
 462         free(buf);
 463         return rc;
 464 }
 465
 466 /*
 467  * note we inherited assumed authority from parent process
 468  */
 469 static int lgssc_kr_negotiate(key_serial_t keyid, struct lgss_cred *cred,
 470                               struct keyring_upcall_param *kup)
 471 {
 472         struct lgss_nego_data   lnd;
 473         gss_buffer_desc         token = GSS_C_EMPTY_BUFFER;
 474         OM_uint32               min_stat;
 475         int                     rc = -1;
 476
 477         logmsg(LL_TRACE, "child start on behalf of key %08x: "
 478                "cred %p, uid %u, svc %u, nid %llx, uids: %u:%u/%u:%u\n",
 479                keyid, cred, cred->lc_uid, cred->lc_tgt_svc, cred->lc_tgt_nid,
 480                kup->kup_uid, kup->kup_gid, kup->kup_fsuid, kup->kup_fsgid);
 481
 482         if (lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid)) {
 483                 logmsg(LL_ERR, "key %08x: failed to construct service "
 484                        "string\n", keyid);
 485                 error_kernel_key(keyid, -EACCES, 0);
 486                 goto out_cred;
 487         }
 488
 489         if (lgss_using_cred(cred)) {
 490                 logmsg(LL_ERR, "key %08x: can't using cred\n", keyid);
 491                 error_kernel_key(keyid, -EACCES, 0);
 492                 goto out_cred;
 493         }
 494
 495         if (lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n)) {
 496                 logmsg(LL_ERR, "key %08x: failed to initialize "
 497                        "negotiation data\n", keyid);
 498                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 499                 goto out_cred;
 500         }
 501
 502         rc = lgssc_negotiation(&lnd);
 503         if (rc) {
 504                 logmsg(LL_ERR, "key %08x: failed to negotiation\n", keyid);
 505                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 506                 goto out;
 507         }
 508
 509         rc = serialize_context_for_kernel(lnd.lnd_ctx, &token, lnd.lnd_mech);
 510         if (rc) {
 511                 logmsg(LL_ERR, "key %08x: failed to export context\n", keyid);
 512                 error_kernel_key(keyid, rc, lnd.lnd_gss_err);
 513                 goto out;
 514         }
 515
 516         rc = update_kernel_key(keyid,  &lnd, &token);
 517         if (rc)
 518                 goto out;
 519
 520         rc = 0;
 521         logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
 522                keyid, kup->kup_uid);
 523 out:
 524         if (token.length != 0)
 525                 gss_release_buffer(&min_stat, &token);
 526
 527         lgssc_fini_nego_data(&lnd);
 528
 529 out_cred:
 530         lgss_release_cred(cred);
 531         return rc;
 532 }
 533
 534 /*
 535  * call out info format: s[:s]...
 536  *  [0]: secid          (uint)
 537  *  [1]: mech_name      (string)
 538  *  [2]: uid            (uint)
 539  *  [3]: gid            (uint)
 540  *  [4]: flags          (string) FMT: r-root; m-mdt; o-ost
 541  *  [5]: lustre_svc     (uint)
 542  *  [6]: target_nid     (uint64)
 543  *  [7]: target_uuid    (string)
 544  */
 545 static int parse_callout_info(const char *coinfo,
 546                               struct keyring_upcall_param *uparam)
 547 {
 548         const int       nargs = 8;
 549         char            buf[1024];
 550         char           *string = buf;
 551         int             length, i;
 552         char           *data[nargs];
 553         char           *pos;
 554
 555         length = strlen(coinfo) + 1;
 556         if (length > 1024) {
 557                 logmsg(LL_ERR, "coinfo too long\n");
 558                 return -1;
 559         }
 560         memcpy(buf, coinfo, length);
 561
 562         for (i = 0; i < nargs - 1; i++) {
 563                 pos = strchr(string, ':');
 564                 if (pos == NULL) {
 565                         logmsg(LL_ERR, "short of components\n");
 566                         return -1;
 567                 }
 568
 569                 *pos = '\0';
 570                 data[i] = string;
 571                 string = pos + 1;
 572         }
 573         data[i] = string;
 574
 575         logmsg(LL_TRACE, "components: %s,%s,%s,%s,%s,%s,%s,%s\n",
 576                data[0], data[1], data[2], data[3], data[4], data[5],
 577                data[6], data[7]);
 578
 579         uparam->kup_secid = strtol(data[0], NULL, 0);
 580         strlcpy(uparam->kup_mech, data[1], sizeof(uparam->kup_mech));
 581         uparam->kup_uid = strtol(data[2], NULL, 0);
 582         uparam->kup_gid = strtol(data[3], NULL, 0);
 583         if (strchr(data[4], 'r'))
 584                 uparam->kup_is_root = 1;
 585         if (strchr(data[4], 'm'))
 586                 uparam->kup_is_mdt = 1;
 587         if (strchr(data[4], 'o'))
 588                 uparam->kup_is_ost = 1;
 589         uparam->kup_svc = strtol(data[5], NULL, 0);
 590         uparam->kup_nid = strtoll(data[6], NULL, 0);
 591         strlcpy(uparam->kup_tgt, data[7], sizeof(uparam->kup_tgt));
 592
 593         logmsg(LL_DEBUG, "parse call out info: secid %d, mech %s, ugid %u:%u "
 594                "is_root %d, is_mdt %d, is_ost %d, svc %d, nid 0x%llx, tgt %s\n",
 595                uparam->kup_secid, uparam->kup_mech,
 596                uparam->kup_uid, uparam->kup_gid,
 597                uparam->kup_is_root, uparam->kup_is_mdt, uparam->kup_is_ost,
 598                uparam->kup_svc, uparam->kup_nid, uparam->kup_tgt);
 599         return 0;
 600 }
 601
 602 #define LOG_LEVEL_PATH  "/proc/fs/lustre/sptlrpc/gss/lgss_keyring/debug_level"
 603
 604 static void set_log_level()
 605 {
 606         FILE         *file;
 607         unsigned int  level;
 608
 609         file = fopen(LOG_LEVEL_PATH, "r");
 610         if (file == NULL)
 611                 return;
 612
 613         if (fscanf(file, "%u", &level) != 1)
 614                 goto out;
 615
 616         if (level >= LL_MAX)
 617                 goto out;
 618
 619         lgss_set_loglevel(level);
 620 out:
 621         fclose(file);
 622 }
 623
 624 /****************************************
 625  * main process                         *
 626  ****************************************/
 627
 628 int main(int argc, char *argv[])
 629 {
 630         struct keyring_upcall_param     uparam;
 631         key_serial_t                    keyid;
 632         key_serial_t                    sring;
 633         key_serial_t                    inst_keyring;
 634         pid_t                           child;
 635         struct lgss_mech_type          *mech;
 636         struct lgss_cred               *cred;
 637
 638         set_log_level();
 639
 640         logmsg(LL_TRACE, "start parsing parameters\n");
 641         /*
 642          * parse & sanity check upcall parameters
 643          * expected to be called with:
 644          * [1]:  operation
 645          * [2]:  key ID
 646          * [3]:  key type
 647          * [4]:  key description
 648          * [5]:  call out info
 649          * [6]:  UID
 650          * [7]:  GID
 651          * [8]:  thread keyring
 652          * [9]:  process keyring
 653          * [10]: session keyring
 654          */
 655         if (argc != 10 + 1) {
 656                 logmsg(LL_ERR, "invalid parameter number %d\n", argc);
 657                 return 1;
 658         }
 659
 660         logmsg(LL_INFO, "key %s, desc %s, ugid %s:%s, sring %s, coinfo %s\n",
 661                argv[2], argv[4], argv[6], argv[7], argv[10], argv[5]);
 662
 663         memset(&uparam, 0, sizeof(uparam));
 664
 665         if (strcmp(argv[1], "create") != 0) {
 666                 logmsg(LL_ERR, "invalid OP %s\n", argv[1]);
 667                 return 1;
 668         }
 669
 670         if (sscanf(argv[2], "%d", &keyid) != 1) {
 671                 logmsg(LL_ERR, "can't extract KeyID: %s\n", argv[2]);
 672                 return 1;
 673         }
 674
 675         if (sscanf(argv[6], "%d", &uparam.kup_fsuid) != 1) {
 676                 logmsg(LL_ERR, "can't extract UID: %s\n", argv[6]);
 677                 return 1;
 678         }
 679
 680         if (sscanf(argv[7], "%d", &uparam.kup_fsgid) != 1) {
 681                 logmsg(LL_ERR, "can't extract GID: %s\n", argv[7]);
 682                 return 1;
 683         }
 684
 685         if (sscanf(argv[10], "%d", &sring) != 1) {
 686                 logmsg(LL_ERR, "can't extract session keyring: %s\n", argv[10]);
 687                 return 1;
 688         }
 689
 690         if (parse_callout_info(argv[5], &uparam)) {
 691                 logmsg(LL_ERR, "can't extract callout info: %s\n", argv[5]);
 692                 return 1;
 693         }
 694
 695         logmsg(LL_TRACE, "parsing parameters OK\n");
 696
 697         /*
 698          * prepare a cred
 699          */
 700         mech = lgss_name2mech(uparam.kup_mech);
 701         if (mech == NULL) {
 702                 logmsg(LL_ERR, "key %08x: unsupported mech: %s\n",
 703                        keyid, uparam.kup_mech);
 704                 return 1;
 705         }
 706
 707         if (lgss_mech_initialize(mech)) {
 708                 logmsg(LL_ERR, "key %08x: can't initialize mech %s\n",
 709                        keyid, mech->lmt_name);
 710                 return 1;
 711         }
 712
 713         cred = lgss_create_cred(mech);
 714         if (cred == NULL) {
 715                 logmsg(LL_ERR, "key %08x: can't create a new %s cred\n",
 716                        keyid, mech->lmt_name);
 717                 return 1;
 718         }
 719
 720         cred->lc_uid = uparam.kup_uid;
 721         cred->lc_root_flags |= uparam.kup_is_root ? LGSS_ROOT_CRED_ROOT : 0;
 722         cred->lc_root_flags |= uparam.kup_is_mdt ? LGSS_ROOT_CRED_MDT : 0;
 723         cred->lc_root_flags |= uparam.kup_is_ost ? LGSS_ROOT_CRED_OST : 0;
 724         cred->lc_tgt_nid = uparam.kup_nid;
 725         cred->lc_tgt_svc = uparam.kup_svc;
 726
 727         if (lgss_prepare_cred(cred)) {
 728                 logmsg(LL_ERR, "key %08x: failed to prepare credentials "
 729                        "for user %d\n", keyid, uparam.kup_uid);
 730                 return 1;
 731         }
 732
 733         /* pre initialize the key. note the keyring linked to is actually of the
 734          * original requesting process, not _this_ upcall process. if it's for
 735          * root user, don't link to any keyrings because we want fully control
 736          * on it, and share it among all root sessions; otherswise link to
 737          * session keyring.
 738          */
 739         if (cred->lc_root_flags != 0)
 740                 inst_keyring = 0;
 741         else
 742                 inst_keyring = KEY_SPEC_SESSION_KEYRING;
 743
 744         if (keyctl_instantiate(keyid, NULL, 0, inst_keyring)) {
 745                 logmsg(LL_ERR, "instantiate key %08x: %s\n",
 746                        keyid, strerror(errno));
 747                 return 1;
 748         }
 749
 750         logmsg(LL_TRACE, "instantiated kernel key %08x\n", keyid);
 751
 752         /*
 753          * fork a child to do the real gss negotiation
 754          */
 755         child = fork();
 756         if (child == -1) {
 757                 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
 758                        keyid, strerror(errno));
 759                 return 1;
 760         } else if (child == 0) {
 761                 return lgssc_kr_negotiate(keyid, cred, &uparam);
 762         }
 763
 764         logmsg(LL_TRACE, "forked child %d\n", child);
 765         return 0;
 766 }