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         uint64_t        kup_selfnid;
 108         char            kup_tgt[64];
 109         char            kup_mech[16];
 110         unsigned int    kup_is_root:1,
 111                         kup_is_mdt:1,
 112                         kup_is_ost:1;
 113 };
 114
 115 /****************************************
 116  * child process: gss negotiation       *
 117  ****************************************/
 118
 119 #define INIT_CHANNEL    "/proc/fs/lustre/sptlrpc/gss/init_channel"
 120
 121 int do_nego_rpc(struct lgss_nego_data *lnd,
 122                 gss_buffer_desc *gss_token,
 123                 struct lgss_init_res *gr)
 124 {
 125         struct lgssd_ioctl_param  param;
 126         struct passwd            *pw;
 127         int                       fd, ret, res;
 128         char                      outbuf[8192];
 129         unsigned int             *p;
 130
 131         logmsg(LL_TRACE, "start negotiation rpc\n");
 132
 133         pw = getpwuid(lnd->lnd_uid);
 134         if (!pw) {
 135                 logmsg(LL_ERR, "no uid %u in local user database\n",
 136                        lnd->lnd_uid);
 137                 return -EACCES;
 138         }
 139
 140         param.version = GSSD_INTERFACE_VERSION;
 141         param.secid = lnd->lnd_secid;
 142         param.uuid = lnd->lnd_uuid;
 143         param.lustre_svc = lnd->lnd_lsvc;
 144         param.uid = lnd->lnd_uid;
 145         param.gid = pw->pw_gid;
 146         param.send_token_size = gss_token->length;
 147         param.send_token = (char *) gss_token->value;
 148         param.reply_buf_size = sizeof(outbuf);
 149         param.reply_buf = outbuf;
 150
 151         logmsg(LL_TRACE, "to open " INIT_CHANNEL "\n");
 152
 153         fd = open(INIT_CHANNEL, O_WRONLY);
 154         if (fd < 0) {
 155                 logmsg(LL_ERR, "can't open " INIT_CHANNEL "\n");
 156                 return -EACCES;
 157         }
 158
 159         logmsg(LL_TRACE, "to down-write\n");
 160
 161         ret = write(fd, &param, sizeof(param));
 162         if (ret != sizeof(param)) {
 163                 logmsg(LL_ERR, "lustre ioctl err: %d\n", strerror(errno));
 164                 close(fd);
 165                 return -EACCES;
 166         }
 167         close(fd);
 168
 169         logmsg(LL_TRACE, "do_nego_rpc: to parse reply\n");
 170         if (param.status) {
 171                 logmsg(LL_ERR, "status: %d (%s)\n",
 172                        param.status, strerror((int)param.status));
 173
 174                 /* kernel return -ETIMEDOUT means the rpc timedout, we should
 175                  * notify the caller to reinitiate the gss negotiation, by
 176                  * returning -ERESTART
 177                  */
 178                 if (param.status == -ETIMEDOUT)
 179                         return -ERESTART;
 180                 else
 181                         return param.status;
 182         }
 183
 184         p = (unsigned int *)outbuf;
 185         res = *p++;
 186         gr->gr_major = *p++;
 187         gr->gr_minor = *p++;
 188         gr->gr_win = *p++;
 189
 190         gr->gr_ctx.length = *p++;
 191         gr->gr_ctx.value = malloc(gr->gr_ctx.length);
 192         memcpy(gr->gr_ctx.value, p, gr->gr_ctx.length);
 193         p += (((gr->gr_ctx.length + 3) & ~3) / 4);
 194
 195         gr->gr_token.length = *p++;
 196         gr->gr_token.value = malloc(gr->gr_token.length);
 197         memcpy(gr->gr_token.value, p, gr->gr_token.length);
 198         p += (((gr->gr_token.length + 3) & ~3) / 4);
 199
 200         logmsg(LL_DEBUG, "do_nego_rpc: receive handle len %d, token len %d, " \
 201                "res %d\n", gr->gr_ctx.length, gr->gr_token.length, res);
 202         return 0;
 203 }
 204
 205 /*
 206  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 207  */
 208 static int lgssc_negotiation(struct lgss_nego_data *lnd)
 209 {
 210         struct lgss_init_res    gr;
 211         gss_buffer_desc        *recv_tokenp, send_token;
 212         OM_uint32               maj_stat, min_stat, ret_flags;
 213
 214         logmsg(LL_TRACE, "start gss negotiation\n");
 215
 216         /* GSS context establishment loop. */
 217         memset(&gr, 0, sizeof(gr));
 218         recv_tokenp = GSS_C_NO_BUFFER;
 219
 220         for (;;) {
 221                 maj_stat = gss_init_sec_context(&min_stat,
 222                                                 lnd->lnd_cred,
 223                                                 &lnd->lnd_ctx,
 224                                                 lnd->lnd_svc_name,
 225                                                 lnd->lnd_mech,
 226                                                 lnd->lnd_req_flags,
 227                                                 0,            /* time req */
 228                                                 NULL,         /* channel */
 229                                                 recv_tokenp,
 230                                                 NULL,         /* used mech */
 231                                                 &send_token,
 232                                                 &ret_flags,
 233                                                 NULL);        /* time rec */
 234
 235                 if (recv_tokenp != GSS_C_NO_BUFFER) {
 236                         gss_release_buffer(&min_stat, &gr.gr_token);
 237                         recv_tokenp = GSS_C_NO_BUFFER;
 238                 }
 239
 240                 if (maj_stat != GSS_S_COMPLETE &&
 241                     maj_stat != GSS_S_CONTINUE_NEEDED) {
 242                         lnd->lnd_gss_err = maj_stat;
 243
 244                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 245                                    "failed init context");
 246                         break;
 247                 }
 248
 249                 if (send_token.length != 0) {
 250                         memset(&gr, 0, sizeof(gr));
 251
 252                         lnd->lnd_rpc_err = do_nego_rpc(lnd, &send_token, &gr);
 253                         gss_release_buffer(&min_stat, &send_token);
 254
 255                         if (lnd->lnd_rpc_err) {
 256                                 logmsg(LL_ERR, "negotiation rpc error: %d\n",
 257                                        lnd->lnd_rpc_err);
 258                                 return -1;
 259                         }
 260
 261                         if (gr.gr_major != GSS_S_COMPLETE &&
 262                             gr.gr_major != GSS_S_CONTINUE_NEEDED) {
 263                                 lnd->lnd_gss_err = gr.gr_major;
 264
 265                                 logmsg(LL_ERR, "negotiation gss error %x\n",
 266                                        lnd->lnd_gss_err);
 267                                 return -1;
 268                         }
 269
 270                         if (gr.gr_ctx.length != 0) {
 271                                 if (lnd->lnd_rmt_ctx.value)
 272                                         gss_release_buffer(&min_stat,
 273                                                            &lnd->lnd_rmt_ctx);
 274                                 lnd->lnd_rmt_ctx = gr.gr_ctx;
 275                         }
 276
 277                         if (gr.gr_token.length != 0) {
 278                                 if (maj_stat != GSS_S_CONTINUE_NEEDED)
 279                                         break;
 280                                 recv_tokenp = &gr.gr_token;
 281                         }
 282                 }
 283
 284                 /* GSS_S_COMPLETE => check gss header verifier,
 285                  * usually checked in gss_validate
 286                  */
 287                 if (maj_stat == GSS_S_COMPLETE) {
 288                         lnd->lnd_established = 1;
 289                         lnd->lnd_seq_win = gr.gr_win;
 290                         break;
 291                 }
 292         }
 293
 294         /* End context negotiation loop. */
 295         if (!lnd->lnd_established) {
 296                 if (gr.gr_token.length != 0)
 297                         gss_release_buffer(&min_stat, &gr.gr_token);
 298
 299                 if (lnd->lnd_gss_err == GSS_S_COMPLETE)
 300                         lnd->lnd_rpc_err = -EACCES;
 301
 302                 logmsg(LL_ERR, "context negotiation failed\n");
 303                 return -1;
 304         }
 305
 306         logmsg(LL_DEBUG, "successfully negotiated a context\n");
 307         return 0;
 308 }
 309
 310 /*
 311  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 312  */
 313 static int lgssc_init_nego_data(struct lgss_nego_data *lnd,
 314                                 struct keyring_upcall_param *kup,
 315                                 lgss_mech_t mech)
 316 {
 317         gss_buffer_desc         sname;
 318         OM_uint32               maj_stat, min_stat;
 319
 320         memset(lnd, 0, sizeof(*lnd));
 321
 322         lnd->lnd_secid = kup->kup_secid;
 323         lnd->lnd_uid = kup->kup_uid;
 324         lnd->lnd_lsvc = kup->kup_svc;
 325         lnd->lnd_uuid = kup->kup_tgt;
 326
 327         lnd->lnd_established = 0;
 328         lnd->lnd_svc_name = GSS_C_NO_NAME;
 329         lnd->lnd_cred = GSS_C_NO_CREDENTIAL;
 330         lnd->lnd_ctx = GSS_C_NO_CONTEXT;
 331         lnd->lnd_rmt_ctx = (gss_buffer_desc) GSS_C_EMPTY_BUFFER;
 332         lnd->lnd_seq_win = 0;
 333
 334         switch (mech) {
 335         case LGSS_MECH_KRB5:
 336                 lnd->lnd_mech = (gss_OID) &krb5oid;
 337                 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
 338                 break;
 339         default:
 340                 logmsg(LL_ERR, "invalid mech: %d\n", mech);
 341                 lnd->lnd_rpc_err = -EACCES;
 342                 return -1;
 343         }
 344
 345         sname.value = g_service;
 346         sname.length = strlen(g_service);
 347
 348         maj_stat = gss_import_name(&min_stat, &sname,
 349                                    (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
 350                                    &lnd->lnd_svc_name);
 351         if (maj_stat != GSS_S_COMPLETE) {
 352                 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 353                            "can't import svc name");
 354                 lnd->lnd_gss_err = maj_stat;
 355                 return -1;
 356         }
 357
 358         return 0;
 359 }
 360
 361 void lgssc_fini_nego_data(struct lgss_nego_data *lnd)
 362 {
 363         OM_uint32       maj_stat, min_stat;
 364
 365         if (lnd->lnd_svc_name != GSS_C_NO_NAME) {
 366                 maj_stat = gss_release_name(&min_stat, &lnd->lnd_svc_name);
 367                 if (maj_stat != GSS_S_COMPLETE)
 368                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 369                                    "can't release service name");
 370         }
 371
 372         if (lnd->lnd_cred != GSS_C_NO_CREDENTIAL) {
 373                 maj_stat = gss_release_cred(&min_stat, &lnd->lnd_cred);
 374                 if (maj_stat != GSS_S_COMPLETE)
 375                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 376                                    "can't release credential");
 377         }
 378 }
 379
 380 static
 381 int error_kernel_key(key_serial_t keyid, int rpc_error, int gss_error)
 382 {
 383         int      seqwin = 0;
 384         char     buf[32];
 385         char    *p, *end;
 386
 387         logmsg(LL_TRACE, "revoking kernel key %08x\n", keyid);
 388
 389         p = buf;
 390         end = buf + sizeof(buf);
 391
 392         WRITE_BYTES(&p, end, seqwin);
 393         WRITE_BYTES(&p, end, rpc_error);
 394         WRITE_BYTES(&p, end, gss_error);
 395
 396 again:
 397         if (keyctl_update(keyid, buf, p - buf)) {
 398                 if (errno != EAGAIN) {
 399                         logmsg(LL_ERR, "revoke key %08x: %s\n",
 400                                keyid, strerror(errno));
 401                         return -1;
 402                 }
 403
 404                 logmsg(LL_WARN, "key %08x: revoking too soon, try again\n",
 405                        keyid);
 406                 sleep(2);
 407                 goto again;
 408         }
 409
 410         logmsg(LL_INFO, "key %08x: revoked\n", keyid);
 411         return 0;
 412 }
 413
 414 static
 415 int update_kernel_key(key_serial_t keyid,
 416                       struct lgss_nego_data *lnd,
 417                       gss_buffer_desc *ctx_token)
 418 {
 419         char        *buf = NULL, *p = NULL, *end = NULL;
 420         unsigned int buf_size = 0;
 421         int          rc;
 422
 423         logmsg(LL_TRACE, "updating kernel key %08x\n", keyid);
 424
 425         buf_size = sizeof(lnd->lnd_seq_win) +
 426                    sizeof(lnd->lnd_rmt_ctx.length) + lnd->lnd_rmt_ctx.length +
 427                    sizeof(ctx_token->length) + ctx_token->length;
 428         buf = malloc(buf_size);
 429         if (buf == NULL) {
 430                 logmsg(LL_ERR, "key %08x: can't alloc update buf: size %d\n",
 431                        keyid, buf_size);
 432                 return 1;
 433         }
 434
 435         p = buf;
 436         end = buf + buf_size;
 437         rc = -1;
 438
 439         if (WRITE_BYTES(&p, end, lnd->lnd_seq_win))
 440                 goto out;
 441         if (write_buffer(&p, end, &lnd->lnd_rmt_ctx))
 442                 goto out;
 443         if (write_buffer(&p, end, ctx_token))
 444                 goto out;
 445
 446 again:
 447         if (keyctl_update(keyid, buf, p - buf)) {
 448                 if (errno != EAGAIN) {
 449                         logmsg(LL_ERR, "update key %08x: %s\n",
 450                                keyid, strerror(errno));
 451                         goto out;
 452                 }
 453
 454                 logmsg(LL_DEBUG, "key %08x: updating too soon, try again\n",
 455                        keyid);
 456                 sleep(2);
 457                 goto again;
 458         }
 459
 460         rc = 0;
 461         logmsg(LL_DEBUG, "key %08x: updated\n", keyid);
 462 out:
 463         free(buf);
 464         return rc;
 465 }
 466
 467 /*
 468  * note we inherited assumed authority from parent process
 469  */
 470 static int lgssc_kr_negotiate(key_serial_t keyid, struct lgss_cred *cred,
 471                               struct keyring_upcall_param *kup)
 472 {
 473         struct lgss_nego_data   lnd;
 474         gss_buffer_desc         token = GSS_C_EMPTY_BUFFER;
 475         OM_uint32               min_stat;
 476         int                     rc = -1;
 477
 478         logmsg(LL_TRACE, "child start on behalf of key %08x: "
 479                "cred %p, uid %u, svc %u, nid %llx, uids: %u:%u/%u:%u\n",
 480                keyid, cred, cred->lc_uid, cred->lc_tgt_svc, cred->lc_tgt_nid,
 481                kup->kup_uid, kup->kup_gid, kup->kup_fsuid, kup->kup_fsgid);
 482
 483         if (lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid)) {
 484                 logmsg(LL_ERR, "key %08x: failed to construct service "
 485                        "string\n", keyid);
 486                 error_kernel_key(keyid, -EACCES, 0);
 487                 goto out_cred;
 488         }
 489
 490         if (lgss_using_cred(cred)) {
 491                 logmsg(LL_ERR, "key %08x: can't using cred\n", keyid);
 492                 error_kernel_key(keyid, -EACCES, 0);
 493                 goto out_cred;
 494         }
 495
 496         if (lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n)) {
 497                 logmsg(LL_ERR, "key %08x: failed to initialize "
 498                        "negotiation data\n", keyid);
 499                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 500                 goto out_cred;
 501         }
 502
 503         rc = lgssc_negotiation(&lnd);
 504         if (rc) {
 505                 logmsg(LL_ERR, "key %08x: failed to negotiation\n", keyid);
 506                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 507                 goto out;
 508         }
 509
 510         rc = serialize_context_for_kernel(lnd.lnd_ctx, &token, lnd.lnd_mech);
 511         if (rc) {
 512                 logmsg(LL_ERR, "key %08x: failed to export context\n", keyid);
 513                 error_kernel_key(keyid, rc, lnd.lnd_gss_err);
 514                 goto out;
 515         }
 516
 517         rc = update_kernel_key(keyid,  &lnd, &token);
 518         if (rc)
 519                 goto out;
 520
 521         rc = 0;
 522         logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
 523                keyid, kup->kup_uid);
 524 out:
 525         if (token.length != 0)
 526                 gss_release_buffer(&min_stat, &token);
 527
 528         lgssc_fini_nego_data(&lnd);
 529
 530 out_cred:
 531         lgss_release_cred(cred);
 532         return rc;
 533 }
 534
 535 /*
 536  * call out info format: s[:s]...
 537  *  [0]: secid          (uint)
 538  *  [1]: mech_name      (string)
 539  *  [2]: uid            (uint)
 540  *  [3]: gid            (uint)
 541  *  [4]: flags          (string) FMT: r-root; m-mdt; o-ost
 542  *  [5]: lustre_svc     (uint)
 543  *  [6]: target_nid     (uint64)
 544  *  [7]: target_uuid    (string)
 545  *  [8]: self_nid        (uint64)
 546  */
 547 static int parse_callout_info(const char *coinfo,
 548                               struct keyring_upcall_param *uparam)
 549 {
 550         const int       nargs = 9;
 551         char            buf[1024];
 552         char           *string = buf;
 553         int             length, i;
 554         char           *data[nargs];
 555         char           *pos;
 556
 557         length = strlen(coinfo) + 1;
 558         if (length > 1024) {
 559                 logmsg(LL_ERR, "coinfo too long\n");
 560                 return -1;
 561         }
 562         memcpy(buf, coinfo, length);
 563
 564         for (i = 0; i < nargs - 1; i++) {
 565                 pos = strchr(string, ':');
 566                 if (pos == NULL) {
 567                         logmsg(LL_ERR, "short of components\n");
 568                         return -1;
 569                 }
 570
 571                 *pos = '\0';
 572                 data[i] = string;
 573                 string = pos + 1;
 574         }
 575         data[i] = string;
 576
 577         logmsg(LL_TRACE, "components: %s,%s,%s,%s,%s,%s,%s,%s,%s\n",
 578                data[0], data[1], data[2], data[3], data[4], data[5],
 579                data[6], data[7], data[8]);
 580
 581         uparam->kup_secid = strtol(data[0], NULL, 0);
 582         strlcpy(uparam->kup_mech, data[1], sizeof(uparam->kup_mech));
 583         uparam->kup_uid = strtol(data[2], NULL, 0);
 584         uparam->kup_gid = strtol(data[3], NULL, 0);
 585         if (strchr(data[4], 'r'))
 586                 uparam->kup_is_root = 1;
 587         if (strchr(data[4], 'm'))
 588                 uparam->kup_is_mdt = 1;
 589         if (strchr(data[4], 'o'))
 590                 uparam->kup_is_ost = 1;
 591         uparam->kup_svc = strtol(data[5], NULL, 0);
 592         uparam->kup_nid = strtoll(data[6], NULL, 0);
 593         strlcpy(uparam->kup_tgt, data[7], sizeof(uparam->kup_tgt));
 594         uparam->kup_selfnid = strtoll(data[8], NULL, 0);
 595
 596         logmsg(LL_DEBUG, "parse call out info: secid %d, mech %s, ugid %u:%u, "
 597                "is_root %d, is_mdt %d, is_ost %d, svc %d, nid 0x%llx, tgt %s, "
 598                "self nid 0x%llx\n",
 599                uparam->kup_secid, uparam->kup_mech,
 600                uparam->kup_uid, uparam->kup_gid,
 601                uparam->kup_is_root, uparam->kup_is_mdt, uparam->kup_is_ost,
 602                uparam->kup_svc, uparam->kup_nid, uparam->kup_tgt,
 603                uparam->kup_selfnid);
 604         return 0;
 605 }
 606
 607 #define LOG_LEVEL_PATH  "/proc/fs/lustre/sptlrpc/gss/lgss_keyring/debug_level"
 608
 609 static void set_log_level()
 610 {
 611         FILE         *file;
 612         unsigned int  level;
 613
 614         file = fopen(LOG_LEVEL_PATH, "r");
 615         if (file == NULL)
 616                 return;
 617
 618         if (fscanf(file, "%u", &level) != 1)
 619                 goto out;
 620
 621         if (level >= LL_MAX)
 622                 goto out;
 623
 624         lgss_set_loglevel(level);
 625 out:
 626         fclose(file);
 627 }
 628
 629 /****************************************
 630  * main process                         *
 631  ****************************************/
 632
 633 int main(int argc, char *argv[])
 634 {
 635         struct keyring_upcall_param     uparam;
 636         key_serial_t                    keyid;
 637         key_serial_t                    sring;
 638         key_serial_t                    inst_keyring;
 639         pid_t                           child;
 640         struct lgss_mech_type          *mech;
 641         struct lgss_cred               *cred;
 642
 643         set_log_level();
 644
 645         logmsg(LL_TRACE, "start parsing parameters\n");
 646         /*
 647          * parse & sanity check upcall parameters
 648          * expected to be called with:
 649          * [1]:  operation
 650          * [2]:  key ID
 651          * [3]:  key type
 652          * [4]:  key description
 653          * [5]:  call out info
 654          * [6]:  UID
 655          * [7]:  GID
 656          * [8]:  thread keyring
 657          * [9]:  process keyring
 658          * [10]: session keyring
 659          */
 660         if (argc != 10 + 1) {
 661                 logmsg(LL_ERR, "invalid parameter number %d\n", argc);
 662                 return 1;
 663         }
 664
 665         logmsg(LL_INFO, "key %s, desc %s, ugid %s:%s, sring %s, coinfo %s\n",
 666                argv[2], argv[4], argv[6], argv[7], argv[10], argv[5]);
 667
 668         memset(&uparam, 0, sizeof(uparam));
 669
 670         if (strcmp(argv[1], "create") != 0) {
 671                 logmsg(LL_ERR, "invalid OP %s\n", argv[1]);
 672                 return 1;
 673         }
 674
 675         if (sscanf(argv[2], "%d", &keyid) != 1) {
 676                 logmsg(LL_ERR, "can't extract KeyID: %s\n", argv[2]);
 677                 return 1;
 678         }
 679
 680         if (sscanf(argv[6], "%d", &uparam.kup_fsuid) != 1) {
 681                 logmsg(LL_ERR, "can't extract UID: %s\n", argv[6]);
 682                 return 1;
 683         }
 684
 685         if (sscanf(argv[7], "%d", &uparam.kup_fsgid) != 1) {
 686                 logmsg(LL_ERR, "can't extract GID: %s\n", argv[7]);
 687                 return 1;
 688         }
 689
 690         if (sscanf(argv[10], "%d", &sring) != 1) {
 691                 logmsg(LL_ERR, "can't extract session keyring: %s\n", argv[10]);
 692                 return 1;
 693         }
 694
 695         if (parse_callout_info(argv[5], &uparam)) {
 696                 logmsg(LL_ERR, "can't extract callout info: %s\n", argv[5]);
 697                 return 1;
 698         }
 699
 700         logmsg(LL_TRACE, "parsing parameters OK\n");
 701
 702         /*
 703          * prepare a cred
 704          */
 705         mech = lgss_name2mech(uparam.kup_mech);
 706         if (mech == NULL) {
 707                 logmsg(LL_ERR, "key %08x: unsupported mech: %s\n",
 708                        keyid, uparam.kup_mech);
 709                 return 1;
 710         }
 711
 712         if (lgss_mech_initialize(mech)) {
 713                 logmsg(LL_ERR, "key %08x: can't initialize mech %s\n",
 714                        keyid, mech->lmt_name);
 715                 return 1;
 716         }
 717
 718         cred = lgss_create_cred(mech);
 719         if (cred == NULL) {
 720                 logmsg(LL_ERR, "key %08x: can't create a new %s cred\n",
 721                        keyid, mech->lmt_name);
 722                 return 1;
 723         }
 724
 725         cred->lc_uid = uparam.kup_uid;
 726         cred->lc_root_flags |= uparam.kup_is_root ? LGSS_ROOT_CRED_ROOT : 0;
 727         cred->lc_root_flags |= uparam.kup_is_mdt ? LGSS_ROOT_CRED_MDT : 0;
 728         cred->lc_root_flags |= uparam.kup_is_ost ? LGSS_ROOT_CRED_OST : 0;
 729         cred->lc_tgt_nid = uparam.kup_nid;
 730         cred->lc_tgt_svc = uparam.kup_svc;
 731         cred->lc_self_nid = uparam.kup_selfnid;
 732
 733         if (lgss_prepare_cred(cred)) {
 734                 logmsg(LL_ERR, "key %08x: failed to prepare credentials "
 735                        "for user %d\n", keyid, uparam.kup_uid);
 736                 return 1;
 737         }
 738
 739         /* pre initialize the key. note the keyring linked to is actually of the
 740          * original requesting process, not _this_ upcall process. if it's for
 741          * root user, don't link to any keyrings because we want fully control
 742          * on it, and share it among all root sessions; otherswise link to
 743          * session keyring.
 744          */
 745         if (cred->lc_root_flags != 0)
 746                 inst_keyring = 0;
 747         else
 748                 inst_keyring = KEY_SPEC_SESSION_KEYRING;
 749
 750         if (keyctl_instantiate(keyid, NULL, 0, inst_keyring)) {
 751                 logmsg(LL_ERR, "instantiate key %08x: %s\n",
 752                        keyid, strerror(errno));
 753                 return 1;
 754         }
 755
 756         logmsg(LL_TRACE, "instantiated kernel key %08x\n", keyid);
 757
 758         /*
 759          * fork a child to do the real gss negotiation
 760          */
 761         child = fork();
 762         if (child == -1) {
 763                 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
 764                        keyid, strerror(errno));
 765                 return 1;
 766         } else if (child == 0) {
 767                 return lgssc_kr_negotiate(keyid, cred, &uparam);
 768         }
 769
 770         logmsg(LL_TRACE, "forked child %d\n", child);
 771         return 0;
 772 }