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 <inttypes.h>
  48 #include <string.h>
  49 #include <errno.h>
  50 #include <pwd.h>
  51 #include <keyutils.h>
  52 #include <gssapi/gssapi.h>
  53
  54 #include <libcfs/util/param.h>
  55 #include <libcfs/util/string.h>
  56 #include "lsupport.h"
  57 #include "lgss_utils.h"
  58 #include "write_bytes.h"
  59 #include "context.h"
  60
  61 /*
  62  * gss target string of lustre service we are negotiating for
  63  */
  64 static char *g_service = NULL;
  65
  66 /*
  67  * all data about negotiation
  68  */
  69 struct lgss_nego_data {
  70         uint32_t        lnd_established:1;
  71
  72         int             lnd_secid;
  73         uint32_t        lnd_uid;
  74         uint32_t        lnd_lsvc;
  75         char            *lnd_uuid;
  76
  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 */
  85
  86         int             lnd_rpc_err;
  87         int             lnd_gss_err;
  88 };
  89
  90 /*
  91  * context creation response
  92  */
  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 */
  99 };
 100
 101 struct keyring_upcall_param {
 102         uint32_t        kup_ver;
 103         uint32_t        kup_secid;
 104         uint32_t        kup_uid;
 105         uint32_t        kup_fsuid;
 106         uint32_t        kup_gid;
 107         uint32_t        kup_fsgid;
 108         uint32_t        kup_svc;
 109         uint64_t        kup_nid;
 110         uint64_t        kup_selfnid;
 111         char            kup_svc_type;
 112         char            kup_tgt[64];
 113         char            kup_mech[16];
 114         unsigned int    kup_is_root:1,
 115                         kup_is_mdt:1,
 116                         kup_is_ost:1;
 117 };
 118
 119 /****************************************
 120  * child process: gss negotiation       *
 121  ****************************************/
 122
 123 int do_nego_rpc(struct lgss_nego_data *lnd,
 124                 gss_buffer_desc *gss_token,
 125                 struct lgss_init_res *gr)
 126 {
 127         struct lgssd_ioctl_param param;
 128         struct passwd *pw;
 129         int fd, ret, res;
 130         char outbuf[8192];
 131         unsigned int *p;
 132         glob_t path;
 133         int rc;
 134
 135         logmsg(LL_TRACE, "start negotiation rpc\n");
 136
 137         pw = getpwuid(lnd->lnd_uid);
 138         if (!pw) {
 139                 logmsg(LL_ERR, "no uid %u in local user database\n",
 140                        lnd->lnd_uid);
 141                 return -EACCES;
 142         }
 143
 144         param.version = GSSD_INTERFACE_VERSION;
 145         param.secid = lnd->lnd_secid;
 146         param.uuid = lnd->lnd_uuid;
 147         param.lustre_svc = lnd->lnd_lsvc;
 148         param.uid = lnd->lnd_uid;
 149         param.gid = pw->pw_gid;
 150         param.send_token_size = gss_token->length;
 151         param.send_token = (char *) gss_token->value;
 152         param.reply_buf_size = sizeof(outbuf);
 153         param.reply_buf = outbuf;
 154
 155         rc = cfs_get_param_paths(&path, "sptlrpc/gss/init_channel");
 156         if (rc != 0)
 157                 return rc;
 158
 159         logmsg(LL_TRACE, "to open %s\n", path.gl_pathv[0]);
 160
 161         fd = open(path.gl_pathv[0], O_WRONLY);
 162         if (fd < 0) {
 163                 logmsg(LL_ERR, "can't open %s\n", path.gl_pathv[0]);
 164                 rc = -EACCES;
 165                 goto out_params;
 166         }
 167
 168         logmsg(LL_TRACE, "to down-write\n");
 169
 170         ret = write(fd, &param, sizeof(param));
 171         close(fd);
 172         if (ret != sizeof(param)) {
 173                 logmsg(LL_ERR, "lustre ioctl err: %s\n", strerror(errno));
 174                 rc = -EACCES;
 175                 goto out_params;
 176         }
 177
 178         logmsg(LL_TRACE, "do_nego_rpc: to parse reply\n");
 179         if (param.status) {
 180                 logmsg(LL_ERR, "status: %ld (%s)\n",
 181                        param.status, strerror((int)(-param.status)));
 182
 183                 /* kernel return -ETIMEDOUT means the rpc timedout, we should
 184                  * notify the caller to reinitiate the gss negotiation, by
 185                  * returning -ERESTART
 186                  */
 187                 if (param.status == -ETIMEDOUT)
 188                         rc = -ERESTART;
 189                 else
 190                         rc = param.status;
 191                 goto out_params;
 192         }
 193
 194         p = (unsigned int *)outbuf;
 195         res = *p++;
 196         gr->gr_major = *p++;
 197         gr->gr_minor = *p++;
 198         gr->gr_win = *p++;
 199
 200         gr->gr_ctx.length = *p++;
 201         gr->gr_ctx.value = malloc(gr->gr_ctx.length);
 202         if (gr->gr_ctx.value == NULL)
 203                 return -ENOMEM;
 204         memcpy(gr->gr_ctx.value, p, gr->gr_ctx.length);
 205         p += (((gr->gr_ctx.length + 3) & ~3) / 4);
 206
 207         gr->gr_token.length = *p++;
 208         gr->gr_token.value = malloc(gr->gr_token.length);
 209         if (gr->gr_token.value == NULL) {
 210                 free(gr->gr_ctx.value);
 211                 return -ENOMEM;
 212         }
 213         memcpy(gr->gr_token.value, p, gr->gr_token.length);
 214         p += (((gr->gr_token.length + 3) & ~3) / 4);
 215
 216         logmsg(LL_DEBUG, "do_nego_rpc: receive handle len %zu, token len %zu, "
 217                "res %d\n", gr->gr_ctx.length, gr->gr_token.length, res);
 218 out_params:
 219         cfs_free_param_data(&path);
 220         return rc;
 221 }
 222
 223 /*
 224  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 225  */
 226 static int lgssc_negotiation(struct lgss_nego_data *lnd)
 227 {
 228         struct lgss_init_res    gr;
 229         gss_buffer_desc        *recv_tokenp, send_token;
 230         OM_uint32               maj_stat, min_stat, ret_flags;
 231
 232         logmsg(LL_TRACE, "start gss negotiation\n");
 233
 234         /* GSS context establishment loop. */
 235         memset(&gr, 0, sizeof(gr));
 236         recv_tokenp = GSS_C_NO_BUFFER;
 237
 238         for (;;) {
 239                 maj_stat = gss_init_sec_context(&min_stat,
 240                                                 lnd->lnd_cred,
 241                                                 &lnd->lnd_ctx,
 242                                                 lnd->lnd_svc_name,
 243                                                 lnd->lnd_mech,
 244                                                 lnd->lnd_req_flags,
 245                                                 0,            /* time req */
 246                                                 NULL,         /* channel */
 247                                                 recv_tokenp,
 248                                                 NULL,         /* used mech */
 249                                                 &send_token,
 250                                                 &ret_flags,
 251                                                 NULL);        /* time rec */
 252
 253                 if (recv_tokenp != GSS_C_NO_BUFFER) {
 254                         gss_release_buffer(&min_stat, &gr.gr_token);
 255                         recv_tokenp = GSS_C_NO_BUFFER;
 256                 }
 257
 258                 if (maj_stat != GSS_S_COMPLETE &&
 259                     maj_stat != GSS_S_CONTINUE_NEEDED) {
 260                         lnd->lnd_gss_err = maj_stat;
 261
 262                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 263                                    "failed init context");
 264                         break;
 265                 }
 266
 267                 if (send_token.length != 0) {
 268                         memset(&gr, 0, sizeof(gr));
 269
 270                         lnd->lnd_rpc_err = do_nego_rpc(lnd, &send_token, &gr);
 271                         gss_release_buffer(&min_stat, &send_token);
 272
 273                         if (lnd->lnd_rpc_err) {
 274                                 logmsg(LL_ERR, "negotiation rpc error: %d\n",
 275                                        lnd->lnd_rpc_err);
 276                                 return -1;
 277                         }
 278
 279                         if (gr.gr_major != GSS_S_COMPLETE &&
 280                             gr.gr_major != GSS_S_CONTINUE_NEEDED) {
 281                                 lnd->lnd_gss_err = gr.gr_major;
 282
 283                                 logmsg(LL_ERR, "negotiation gss error %x\n",
 284                                        lnd->lnd_gss_err);
 285                                 return -1;
 286                         }
 287
 288                         if (gr.gr_ctx.length != 0) {
 289                                 if (lnd->lnd_rmt_ctx.value)
 290                                         gss_release_buffer(&min_stat,
 291                                                            &lnd->lnd_rmt_ctx);
 292                                 lnd->lnd_rmt_ctx = gr.gr_ctx;
 293                         }
 294
 295                         if (gr.gr_token.length != 0) {
 296                                 if (maj_stat != GSS_S_CONTINUE_NEEDED)
 297                                         break;
 298                                 recv_tokenp = &gr.gr_token;
 299                         }
 300                 }
 301
 302                 /* GSS_S_COMPLETE => check gss header verifier,
 303                  * usually checked in gss_validate
 304                  */
 305                 if (maj_stat == GSS_S_COMPLETE) {
 306                         lnd->lnd_established = 1;
 307                         lnd->lnd_seq_win = gr.gr_win;
 308                         break;
 309                 }
 310         }
 311
 312         /* End context negotiation loop. */
 313         if (!lnd->lnd_established) {
 314                 if (gr.gr_token.length != 0)
 315                         gss_release_buffer(&min_stat, &gr.gr_token);
 316
 317                 if (lnd->lnd_gss_err == GSS_S_COMPLETE)
 318                         lnd->lnd_rpc_err = -EACCES;
 319
 320                 logmsg(LL_ERR, "context negotiation failed\n");
 321                 return -1;
 322         }
 323
 324         logmsg(LL_DEBUG, "successfully negotiated a context\n");
 325         return 0;
 326 }
 327
 328 /*
 329  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 330  */
 331 static int lgssc_init_nego_data(struct lgss_nego_data *lnd,
 332                                 struct keyring_upcall_param *kup,
 333                                 enum lgss_mech mech)
 334 {
 335         gss_buffer_desc         sname;
 336         OM_uint32               maj_stat, min_stat;
 337
 338         memset(lnd, 0, sizeof(*lnd));
 339
 340         lnd->lnd_secid = kup->kup_secid;
 341         lnd->lnd_uid = kup->kup_uid;
 342         lnd->lnd_lsvc = kup->kup_svc | mech << LUSTRE_GSS_MECH_SHIFT;
 343         lnd->lnd_uuid = kup->kup_tgt;
 344
 345         lnd->lnd_established = 0;
 346         lnd->lnd_svc_name = GSS_C_NO_NAME;
 347         lnd->lnd_cred = GSS_C_NO_CREDENTIAL;
 348         lnd->lnd_ctx = GSS_C_NO_CONTEXT;
 349         lnd->lnd_rmt_ctx = (gss_buffer_desc) GSS_C_EMPTY_BUFFER;
 350         lnd->lnd_seq_win = 0;
 351
 352         switch (mech) {
 353         case LGSS_MECH_KRB5:
 354                 lnd->lnd_mech = (gss_OID) &krb5oid;
 355                 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
 356                 break;
 357         default:
 358                 logmsg(LL_ERR, "invalid mech: %d\n", mech);
 359                 lnd->lnd_rpc_err = -EACCES;
 360                 return -1;
 361         }
 362
 363         sname.value = g_service;
 364         sname.length = strlen(g_service);
 365
 366         maj_stat = gss_import_name(&min_stat, &sname,
 367                                    (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
 368                                    &lnd->lnd_svc_name);
 369         if (maj_stat != GSS_S_COMPLETE) {
 370                 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 371                            "can't import svc name");
 372                 lnd->lnd_gss_err = maj_stat;
 373                 return -1;
 374         }
 375
 376         return 0;
 377 }
 378
 379 void lgssc_fini_nego_data(struct lgss_nego_data *lnd)
 380 {
 381         OM_uint32       maj_stat, min_stat;
 382
 383         if (lnd->lnd_svc_name != GSS_C_NO_NAME) {
 384                 maj_stat = gss_release_name(&min_stat, &lnd->lnd_svc_name);
 385                 if (maj_stat != GSS_S_COMPLETE)
 386                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 387                                    "can't release service name");
 388         }
 389
 390         if (lnd->lnd_cred != GSS_C_NO_CREDENTIAL) {
 391                 maj_stat = gss_release_cred(&min_stat, &lnd->lnd_cred);
 392                 if (maj_stat != GSS_S_COMPLETE)
 393                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 394                                    "can't release credential");
 395         }
 396 }
 397
 398 static
 399 int error_kernel_key(key_serial_t keyid, int rpc_error, int gss_error)
 400 {
 401         int      seqwin = 0;
 402         char     buf[32];
 403         char    *p, *end;
 404
 405         logmsg(LL_TRACE, "revoking kernel key %08x\n", keyid);
 406
 407         p = buf;
 408         end = buf + sizeof(buf);
 409
 410         WRITE_BYTES(&p, end, seqwin);
 411         WRITE_BYTES(&p, end, rpc_error);
 412         WRITE_BYTES(&p, end, gss_error);
 413
 414 again:
 415         if (keyctl_update(keyid, buf, p - buf)) {
 416                 if (errno != EAGAIN) {
 417                         logmsg(LL_ERR, "revoke key %08x: %s\n",
 418                                keyid, strerror(errno));
 419                         return -1;
 420                 }
 421
 422                 logmsg(LL_WARN, "key %08x: revoking too soon, try again\n",
 423                        keyid);
 424                 sleep(2);
 425                 goto again;
 426         }
 427
 428         logmsg(LL_INFO, "key %08x: revoked\n", keyid);
 429         return 0;
 430 }
 431
 432 static
 433 int update_kernel_key(key_serial_t keyid,
 434                       struct lgss_nego_data *lnd,
 435                       gss_buffer_desc *ctx_token)
 436 {
 437         char        *buf = NULL, *p = NULL, *end = NULL;
 438         unsigned int buf_size = 0;
 439         int          rc;
 440
 441         logmsg(LL_TRACE, "updating kernel key %08x\n", keyid);
 442
 443         buf_size = sizeof(lnd->lnd_seq_win) +
 444                    sizeof(lnd->lnd_rmt_ctx.length) + lnd->lnd_rmt_ctx.length +
 445                    sizeof(ctx_token->length) + ctx_token->length;
 446         buf = malloc(buf_size);
 447         if (buf == NULL) {
 448                 logmsg(LL_ERR, "key %08x: can't alloc update buf: size %d\n",
 449                        keyid, buf_size);
 450                 return 1;
 451         }
 452
 453         p = buf;
 454         end = buf + buf_size;
 455         rc = -1;
 456
 457         if (WRITE_BYTES(&p, end, lnd->lnd_seq_win))
 458                 goto out;
 459         if (write_buffer(&p, end, &lnd->lnd_rmt_ctx))
 460                 goto out;
 461         if (write_buffer(&p, end, ctx_token))
 462                 goto out;
 463
 464 again:
 465         if (keyctl_update(keyid, buf, p - buf)) {
 466                 if (errno != EAGAIN) {
 467                         logmsg(LL_ERR, "update key %08x: %s\n",
 468                                keyid, strerror(errno));
 469                         goto out;
 470                 }
 471
 472                 logmsg(LL_DEBUG, "key %08x: updating too soon, try again\n",
 473                        keyid);
 474                 sleep(2);
 475                 goto again;
 476         }
 477
 478         rc = 0;
 479         logmsg(LL_DEBUG, "key %08x: updated\n", keyid);
 480 out:
 481         free(buf);
 482         return rc;
 483 }
 484
 485 static int lgssc_kr_negotiate_krb(key_serial_t keyid, struct lgss_cred *cred,
 486                                   struct keyring_upcall_param *kup)
 487 {
 488         struct lgss_nego_data lnd;
 489         OM_uint32 min_stat;
 490         int rc = -1;
 491
 492         memset(&lnd, 0, sizeof(lnd));
 493
 494         if (lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid)) {
 495                 logmsg(LL_ERR, "key %08x: failed to construct service "
 496                        "string\n", keyid);
 497                 error_kernel_key(keyid, -EACCES, 0);
 498                 goto out_cred;
 499         }
 500
 501         if (lgss_using_cred(cred)) {
 502                 logmsg(LL_ERR, "key %08x: can't using cred\n", keyid);
 503                 error_kernel_key(keyid, -EACCES, 0);
 504                 goto out_cred;
 505         }
 506
 507         if (lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n)) {
 508                 logmsg(LL_ERR, "key %08x: failed to initialize "
 509                        "negotiation data\n", keyid);
 510                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 511                 goto out_cred;
 512         }
 513
 514         rc = lgssc_negotiation(&lnd);
 515         if (rc) {
 516                 logmsg(LL_ERR, "key %08x: failed to negotiation\n", keyid);
 517                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 518                 goto out;
 519         }
 520
 521         rc = serialize_context_for_kernel(lnd.lnd_ctx, &lnd.lnd_ctx_token,
 522                                           lnd.lnd_mech);
 523         if (rc) {
 524                 logmsg(LL_ERR, "key %08x: failed to export context\n", keyid);
 525                 error_kernel_key(keyid, rc, lnd.lnd_gss_err);
 526                 goto out;
 527         }
 528
 529         rc = update_kernel_key(keyid,  &lnd, &lnd.lnd_ctx_token);
 530         if (rc)
 531                 goto out;
 532
 533         rc = 0;
 534         logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
 535                keyid, kup->kup_uid);
 536 out:
 537         if (lnd.lnd_ctx_token.length != 0)
 538                 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
 539
 540         lgssc_fini_nego_data(&lnd);
 541
 542 out_cred:
 543         lgss_release_cred(cred);
 544         return rc;
 545 }
 546
 547 /*
 548  * note we inherited assumed authority from parent process
 549  */
 550 static int lgssc_kr_negotiate(key_serial_t keyid, struct lgss_cred *cred,
 551                               struct keyring_upcall_param *kup)
 552 {
 553         int rc;
 554
 555         logmsg(LL_TRACE, "child start on behalf of key %08x: "
 556                "cred %p, uid %u, svc %u, nid %"PRIx64", uids: %u:%u/%u:%u\n",
 557                keyid, cred, cred->lc_uid, cred->lc_tgt_svc, cred->lc_tgt_nid,
 558                kup->kup_uid, kup->kup_gid, kup->kup_fsuid, kup->kup_fsgid);
 559
 560         switch (cred->lc_mech->lmt_mech_n) {
 561         case LGSS_MECH_KRB5:
 562         default:
 563                 rc = lgssc_kr_negotiate_krb(keyid, cred, kup);
 564                 break;
 565         }
 566
 567         return rc;
 568 }
 569
 570 /*
 571  * call out info format: s[:s]...
 572  *  [0]: secid          (uint)
 573  *  [1]: mech_name      (string)
 574  *  [2]: uid            (uint)
 575  *  [3]: gid            (uint)
 576  *  [4]: flags          (string) FMT: r-root; m-mdt; o-ost
 577  *  [5]: svc type       (char)
 578  *  [6]: lustre_svc     (int)
 579  *  [7]: target_nid     (uint64)
 580  *  [8]: target_uuid    (string)
 581  *  [9]: self_nid        (uint64)
 582  */
 583 static int parse_callout_info(const char *coinfo,
 584                               struct keyring_upcall_param *uparam)
 585 {
 586         const int       nargs = 10;
 587         char            buf[1024];
 588         char           *string = buf;
 589         int             length, i;
 590         char           *data[nargs];
 591         char           *pos;
 592
 593         length = strlen(coinfo) + 1;
 594         if (length > 1024) {
 595                 logmsg(LL_ERR, "coinfo too long\n");
 596                 return -1;
 597         }
 598         memcpy(buf, coinfo, length);
 599
 600         for (i = 0; i < nargs - 1; i++) {
 601                 pos = strchr(string, ':');
 602                 if (pos == NULL) {
 603                         logmsg(LL_ERR, "short of components\n");
 604                         return -1;
 605                 }
 606
 607                 *pos = '\0';
 608                 data[i] = string;
 609                 string = pos + 1;
 610         }
 611         data[i] = string;
 612
 613         logmsg(LL_TRACE, "components: %s,%s,%s,%s,%s,%c,%s,%s,%s,%s\n",
 614                data[0], data[1], data[2], data[3], data[4], data[5][0],
 615                data[6], data[7], data[8], data[9]);
 616
 617         uparam->kup_secid = strtol(data[0], NULL, 0);
 618         strlcpy(uparam->kup_mech, data[1], sizeof(uparam->kup_mech));
 619         uparam->kup_uid = strtol(data[2], NULL, 0);
 620         uparam->kup_gid = strtol(data[3], NULL, 0);
 621         if (strchr(data[4], 'r'))
 622                 uparam->kup_is_root = 1;
 623         if (strchr(data[4], 'm'))
 624                 uparam->kup_is_mdt = 1;
 625         if (strchr(data[4], 'o'))
 626                 uparam->kup_is_ost = 1;
 627         uparam->kup_svc_type = data[5][0];
 628         uparam->kup_svc = strtol(data[6], NULL, 0);
 629         uparam->kup_nid = strtoll(data[7], NULL, 0);
 630         strlcpy(uparam->kup_tgt, data[8], sizeof(uparam->kup_tgt));
 631         uparam->kup_selfnid = strtoll(data[9], NULL, 0);
 632
 633         logmsg(LL_DEBUG, "parse call out info: secid %d, mech %s, ugid %u:%u, "
 634                "is_root %d, is_mdt %d, is_ost %d, svc type %c, svc %d, "
 635                "nid 0x%"PRIx64", tgt %s, self nid 0x%"PRIx64"\n",
 636                uparam->kup_secid, uparam->kup_mech,
 637                uparam->kup_uid, uparam->kup_gid,
 638                uparam->kup_is_root, uparam->kup_is_mdt, uparam->kup_is_ost,
 639                uparam->kup_svc_type, uparam->kup_svc, uparam->kup_nid,
 640                uparam->kup_tgt, uparam->kup_selfnid);
 641         return 0;
 642 }
 643
 644 static void set_log_level()
 645 {
 646         unsigned int level;
 647         glob_t path;
 648         FILE *file;
 649
 650         if (cfs_get_param_paths(&path,
 651                                 "sptlrpc/gss/lgss_keyring/debug_level") != 0)
 652                 return;
 653         file = fopen(path.gl_pathv[0], "r");
 654         if (file == NULL) {
 655                 cfs_free_param_data(&path);
 656                 return;
 657         }
 658
 659         if (fscanf(file, "%u", &level) != 1)
 660                 goto out;
 661
 662         if (level >= LL_MAX)
 663                 goto out;
 664
 665         lgss_set_loglevel(level);
 666 out:
 667         cfs_free_param_data(&path);
 668         fclose(file);
 669 }
 670
 671 /****************************************
 672  * main process                         *
 673  ****************************************/
 674
 675 int main(int argc, char *argv[])
 676 {
 677         struct keyring_upcall_param     uparam;
 678         key_serial_t                    keyid;
 679         key_serial_t                    sring;
 680         key_serial_t                    inst_keyring;
 681         pid_t                           child;
 682         struct lgss_mech_type          *mech;
 683         struct lgss_cred               *cred;
 684
 685         set_log_level();
 686
 687         logmsg(LL_TRACE, "start parsing parameters\n");
 688         /*
 689          * parse & sanity check upcall parameters
 690          * expected to be called with:
 691          * [1]:  operation
 692          * [2]:  key ID
 693          * [3]:  key type
 694          * [4]:  key description
 695          * [5]:  call out info
 696          * [6]:  UID
 697          * [7]:  GID
 698          * [8]:  thread keyring
 699          * [9]:  process keyring
 700          * [10]: session keyring
 701          */
 702         if (argc != 10 + 1) {
 703                 logmsg(LL_ERR, "invalid parameter number %d\n", argc);
 704                 return 1;
 705         }
 706
 707         logmsg(LL_INFO, "key %s, desc %s, ugid %s:%s, sring %s, coinfo %s\n",
 708                argv[2], argv[4], argv[6], argv[7], argv[10], argv[5]);
 709
 710         memset(&uparam, 0, sizeof(uparam));
 711
 712         if (strcmp(argv[1], "create") != 0) {
 713                 logmsg(LL_ERR, "invalid OP %s\n", argv[1]);
 714                 return 1;
 715         }
 716
 717         if (sscanf(argv[2], "%d", &keyid) != 1) {
 718                 logmsg(LL_ERR, "can't extract KeyID: %s\n", argv[2]);
 719                 return 1;
 720         }
 721
 722         if (sscanf(argv[6], "%d", &uparam.kup_fsuid) != 1) {
 723                 logmsg(LL_ERR, "can't extract UID: %s\n", argv[6]);
 724                 return 1;
 725         }
 726
 727         if (sscanf(argv[7], "%d", &uparam.kup_fsgid) != 1) {
 728                 logmsg(LL_ERR, "can't extract GID: %s\n", argv[7]);
 729                 return 1;
 730         }
 731
 732         if (sscanf(argv[10], "%d", &sring) != 1) {
 733                 logmsg(LL_ERR, "can't extract session keyring: %s\n", argv[10]);
 734                 return 1;
 735         }
 736
 737         if (parse_callout_info(argv[5], &uparam)) {
 738                 logmsg(LL_ERR, "can't extract callout info: %s\n", argv[5]);
 739                 return 1;
 740         }
 741
 742         logmsg(LL_TRACE, "parsing parameters OK\n");
 743
 744         /*
 745          * prepare a cred
 746          */
 747         mech = lgss_name2mech(uparam.kup_mech);
 748         if (mech == NULL) {
 749                 logmsg(LL_ERR, "key %08x: unsupported mech: %s\n",
 750                        keyid, uparam.kup_mech);
 751                 return 1;
 752         }
 753
 754         if (lgss_mech_initialize(mech)) {
 755                 logmsg(LL_ERR, "key %08x: can't initialize mech %s\n",
 756                        keyid, mech->lmt_name);
 757                 return 1;
 758         }
 759
 760         cred = lgss_create_cred(mech);
 761         if (cred == NULL) {
 762                 logmsg(LL_ERR, "key %08x: can't create a new %s cred\n",
 763                        keyid, mech->lmt_name);
 764                 return 1;
 765         }
 766
 767         cred->lc_uid = uparam.kup_uid;
 768         cred->lc_root_flags |= uparam.kup_is_root ? LGSS_ROOT_CRED_ROOT : 0;
 769         cred->lc_root_flags |= uparam.kup_is_mdt ? LGSS_ROOT_CRED_MDT : 0;
 770         cred->lc_root_flags |= uparam.kup_is_ost ? LGSS_ROOT_CRED_OST : 0;
 771         cred->lc_tgt_nid = uparam.kup_nid;
 772         cred->lc_tgt_svc = uparam.kup_svc;
 773         cred->lc_tgt_uuid = uparam.kup_tgt;
 774         cred->lc_svc_type = uparam.kup_svc_type;
 775         cred->lc_self_nid = uparam.kup_selfnid;
 776
 777         if (lgss_prepare_cred(cred)) {
 778                 logmsg(LL_ERR, "key %08x: failed to prepare credentials "
 779                        "for user %d\n", keyid, uparam.kup_uid);
 780                 return 1;
 781         }
 782
 783         /* pre initialize the key. note the keyring linked to is actually of the
 784          * original requesting process, not _this_ upcall process. if it's for
 785          * root user, don't link to any keyrings because we want fully control
 786          * on it, and share it among all root sessions; otherswise link to
 787          * session keyring.
 788          */
 789         if (cred->lc_root_flags != 0)
 790                 inst_keyring = 0;
 791         else
 792                 inst_keyring = KEY_SPEC_SESSION_KEYRING;
 793
 794         if (keyctl_instantiate(keyid, NULL, 0, inst_keyring)) {
 795                 logmsg(LL_ERR, "instantiate key %08x: %s\n",
 796                        keyid, strerror(errno));
 797                 return 1;
 798         }
 799
 800         logmsg(LL_TRACE, "instantiated kernel key %08x\n", keyid);
 801
 802         /*
 803          * fork a child to do the real gss negotiation
 804          */
 805         child = fork();
 806         if (child == -1) {
 807                 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
 808                        keyid, strerror(errno));
 809                 return 1;
 810         } else if (child == 0) {
 811                 return lgssc_kr_negotiate(keyid, cred, &uparam);
 812         }
 813
 814         logmsg(LL_TRACE, "forked child %d\n", child);
 815         return 0;
 816 }