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 /* This is used by incomplete GSSAPI implementations that can't use
 224  * gss_init_sec_context and will parse the token themselves (gssnull and sk).
 225  * Callers should have cred->lc_mech_token pointing to a gss_buffer_desc
 226  * token to send to the peer as part of the SEC_CTX_INIT operation.  The return
 227  * RPC's token with be in gr.gr_token which is validated using
 228  * lgss_validate_cred. */
 229 static int lgssc_negotiation_manual(struct lgss_nego_data *lnd,
 230                                     struct lgss_cred *cred)
 231 {
 232         struct lgss_init_res gr;
 233         OM_uint32 min_stat;
 234         int rc;
 235
 236         logmsg(LL_TRACE, "starting gss negotation\n");
 237         memset(&gr, 0, sizeof(gr));
 238
 239         lnd->lnd_rpc_err = do_nego_rpc(lnd, &cred->lc_mech_token, &gr);
 240         if (lnd->lnd_rpc_err) {
 241                 logmsg(LL_ERR, "negotiation rpc error %d\n", lnd->lnd_rpc_err);
 242                 rc = lnd->lnd_rpc_err;
 243                 goto out_error;
 244         }
 245
 246         if (gr.gr_major == GSS_S_CONTINUE_NEEDED) {
 247                 rc = -EAGAIN;
 248                 goto out_error;
 249
 250         } else if (gr.gr_major != GSS_S_COMPLETE) {
 251                 lnd->lnd_gss_err = gr.gr_major;
 252                 logmsg(LL_ERR, "negotiation gss error %x\n", lnd->lnd_gss_err);
 253                 rc = -ENOTCONN;
 254                 goto out_error;
 255         }
 256
 257         if (gr.gr_ctx.length == 0 || gr.gr_token.length == 0) {
 258                 logmsg(LL_ERR, "zero length context or token received\n");
 259                 rc = -EINVAL;
 260                 goto out_error;
 261         }
 262
 263         rc = lgss_validate_cred(cred, &gr.gr_token, &lnd->lnd_ctx_token);
 264         if (rc) {
 265                 logmsg(LL_ERR, "peer token failed validation\n");
 266                 goto out_error;
 267         }
 268
 269         lnd->lnd_established = 1;
 270         lnd->lnd_seq_win = gr.gr_win;
 271         lnd->lnd_rmt_ctx = gr.gr_ctx;
 272
 273         if (gr.gr_token.length != 0)
 274                 gss_release_buffer(&min_stat, &gr.gr_token);
 275
 276         logmsg(LL_DEBUG, "successfully negotiated a context\n");
 277         return 0;
 278
 279 out_error:
 280         if (gr.gr_ctx.length != 0)
 281                 gss_release_buffer(&min_stat, &gr.gr_ctx);
 282         if (gr.gr_token.length != 0)
 283                 gss_release_buffer(&min_stat, &gr.gr_token);
 284
 285         return rc;
 286 }
 287
 288 /*
 289  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 290  */
 291 static int lgssc_negotiation(struct lgss_nego_data *lnd)
 292 {
 293         struct lgss_init_res    gr;
 294         gss_buffer_desc        *recv_tokenp, send_token;
 295         OM_uint32               maj_stat, min_stat, ret_flags;
 296
 297         logmsg(LL_TRACE, "start gss negotiation\n");
 298
 299         /* GSS context establishment loop. */
 300         memset(&gr, 0, sizeof(gr));
 301         recv_tokenp = GSS_C_NO_BUFFER;
 302
 303         for (;;) {
 304                 maj_stat = gss_init_sec_context(&min_stat,
 305                                                 lnd->lnd_cred,
 306                                                 &lnd->lnd_ctx,
 307                                                 lnd->lnd_svc_name,
 308                                                 lnd->lnd_mech,
 309                                                 lnd->lnd_req_flags,
 310                                                 0,            /* time req */
 311                                                 NULL,         /* channel */
 312                                                 recv_tokenp,
 313                                                 NULL,         /* used mech */
 314                                                 &send_token,
 315                                                 &ret_flags,
 316                                                 NULL);        /* time rec */
 317
 318                 if (recv_tokenp != GSS_C_NO_BUFFER) {
 319                         gss_release_buffer(&min_stat, &gr.gr_token);
 320                         recv_tokenp = GSS_C_NO_BUFFER;
 321                 }
 322
 323                 if (maj_stat != GSS_S_COMPLETE &&
 324                     maj_stat != GSS_S_CONTINUE_NEEDED) {
 325                         lnd->lnd_gss_err = maj_stat;
 326
 327                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 328                                    "failed init context");
 329                         break;
 330                 }
 331
 332                 if (send_token.length != 0) {
 333                         memset(&gr, 0, sizeof(gr));
 334
 335                         lnd->lnd_rpc_err = do_nego_rpc(lnd, &send_token, &gr);
 336                         gss_release_buffer(&min_stat, &send_token);
 337
 338                         if (lnd->lnd_rpc_err) {
 339                                 logmsg(LL_ERR, "negotiation rpc error: %d\n",
 340                                        lnd->lnd_rpc_err);
 341                                 return -1;
 342                         }
 343
 344                         if (gr.gr_major != GSS_S_COMPLETE &&
 345                             gr.gr_major != GSS_S_CONTINUE_NEEDED) {
 346                                 lnd->lnd_gss_err = gr.gr_major;
 347
 348                                 logmsg(LL_ERR, "negotiation gss error %x\n",
 349                                        lnd->lnd_gss_err);
 350                                 return -1;
 351                         }
 352
 353                         if (gr.gr_ctx.length != 0) {
 354                                 if (lnd->lnd_rmt_ctx.value)
 355                                         gss_release_buffer(&min_stat,
 356                                                            &lnd->lnd_rmt_ctx);
 357                                 lnd->lnd_rmt_ctx = gr.gr_ctx;
 358                         }
 359
 360                         if (gr.gr_token.length != 0) {
 361                                 if (maj_stat != GSS_S_CONTINUE_NEEDED)
 362                                         break;
 363                                 recv_tokenp = &gr.gr_token;
 364                         }
 365                 }
 366
 367                 /* GSS_S_COMPLETE => check gss header verifier,
 368                  * usually checked in gss_validate
 369                  */
 370                 if (maj_stat == GSS_S_COMPLETE) {
 371                         lnd->lnd_established = 1;
 372                         lnd->lnd_seq_win = gr.gr_win;
 373                         break;
 374                 }
 375         }
 376
 377         /* End context negotiation loop. */
 378         if (!lnd->lnd_established) {
 379                 if (gr.gr_token.length != 0)
 380                         gss_release_buffer(&min_stat, &gr.gr_token);
 381
 382                 if (lnd->lnd_gss_err == GSS_S_COMPLETE)
 383                         lnd->lnd_rpc_err = -EACCES;
 384
 385                 logmsg(LL_ERR, "context negotiation failed\n");
 386                 return -1;
 387         }
 388
 389         logmsg(LL_DEBUG, "successfully negotiated a context\n");
 390         return 0;
 391 }
 392
 393 /*
 394  * if return error, the lnd_rpc_err or lnd_gss_err is set.
 395  */
 396 static int lgssc_init_nego_data(struct lgss_nego_data *lnd,
 397                                 struct keyring_upcall_param *kup,
 398                                 enum lgss_mech mech)
 399 {
 400         gss_buffer_desc         sname;
 401         OM_uint32               maj_stat, min_stat;
 402
 403         memset(lnd, 0, sizeof(*lnd));
 404
 405         lnd->lnd_secid = kup->kup_secid;
 406         lnd->lnd_uid = kup->kup_uid;
 407         lnd->lnd_lsvc = kup->kup_svc | mech << LUSTRE_GSS_MECH_SHIFT;
 408         lnd->lnd_uuid = kup->kup_tgt;
 409
 410         lnd->lnd_established = 0;
 411         lnd->lnd_svc_name = GSS_C_NO_NAME;
 412         lnd->lnd_cred = GSS_C_NO_CREDENTIAL;
 413         lnd->lnd_ctx = GSS_C_NO_CONTEXT;
 414         lnd->lnd_rmt_ctx = (gss_buffer_desc) GSS_C_EMPTY_BUFFER;
 415         lnd->lnd_seq_win = 0;
 416
 417         switch (mech) {
 418         case LGSS_MECH_KRB5:
 419                 lnd->lnd_mech = (gss_OID)&krb5oid;
 420                 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
 421                 break;
 422         case LGSS_MECH_NULL:
 423                 lnd->lnd_mech = (gss_OID)&nulloid;
 424                 break;
 425         case LGSS_MECH_SK:
 426                 lnd->lnd_mech = (gss_OID)&skoid;
 427                 lnd->lnd_req_flags = GSS_C_MUTUAL_FLAG;
 428                 break;
 429         default:
 430                 logmsg(LL_ERR, "invalid mech: %d\n", mech);
 431                 lnd->lnd_rpc_err = -EACCES;
 432                 return -1;
 433         }
 434
 435         sname.value = g_service;
 436         sname.length = strlen(g_service);
 437
 438         maj_stat = gss_import_name(&min_stat, &sname,
 439                                    (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
 440                                    &lnd->lnd_svc_name);
 441         if (maj_stat != GSS_S_COMPLETE) {
 442                 logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 443                            "can't import svc name");
 444                 lnd->lnd_gss_err = maj_stat;
 445                 return -1;
 446         }
 447
 448         return 0;
 449 }
 450
 451 void lgssc_fini_nego_data(struct lgss_nego_data *lnd)
 452 {
 453         OM_uint32       maj_stat, min_stat;
 454
 455         if (lnd->lnd_svc_name != GSS_C_NO_NAME) {
 456                 maj_stat = gss_release_name(&min_stat, &lnd->lnd_svc_name);
 457                 if (maj_stat != GSS_S_COMPLETE)
 458                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 459                                    "can't release service name");
 460         }
 461
 462         if (lnd->lnd_cred != GSS_C_NO_CREDENTIAL) {
 463                 maj_stat = gss_release_cred(&min_stat, &lnd->lnd_cred);
 464                 if (maj_stat != GSS_S_COMPLETE)
 465                         logmsg_gss(LL_ERR, lnd->lnd_mech, maj_stat, min_stat,
 466                                    "can't release credential");
 467         }
 468 }
 469
 470 static
 471 int error_kernel_key(key_serial_t keyid, int rpc_error, int gss_error)
 472 {
 473         int      seqwin = 0;
 474         char     buf[32];
 475         char    *p, *end;
 476
 477         logmsg(LL_TRACE, "revoking kernel key %08x\n", keyid);
 478
 479         p = buf;
 480         end = buf + sizeof(buf);
 481
 482         WRITE_BYTES(&p, end, seqwin);
 483         WRITE_BYTES(&p, end, rpc_error);
 484         WRITE_BYTES(&p, end, gss_error);
 485
 486 again:
 487         if (keyctl_update(keyid, buf, p - buf)) {
 488                 if (errno != EAGAIN) {
 489                         logmsg(LL_ERR, "revoke key %08x: %s\n",
 490                                keyid, strerror(errno));
 491                         return -1;
 492                 }
 493
 494                 logmsg(LL_WARN, "key %08x: revoking too soon, try again\n",
 495                        keyid);
 496                 sleep(2);
 497                 goto again;
 498         }
 499
 500         logmsg(LL_INFO, "key %08x: revoked\n", keyid);
 501         return 0;
 502 }
 503
 504 static
 505 int update_kernel_key(key_serial_t keyid,
 506                       struct lgss_nego_data *lnd,
 507                       gss_buffer_desc *ctx_token)
 508 {
 509         char        *buf = NULL, *p = NULL, *end = NULL;
 510         unsigned int buf_size = 0;
 511         int          rc;
 512
 513         logmsg(LL_TRACE, "updating kernel key %08x\n", keyid);
 514
 515         buf_size = sizeof(lnd->lnd_seq_win) +
 516                    sizeof(lnd->lnd_rmt_ctx.length) + lnd->lnd_rmt_ctx.length +
 517                    sizeof(ctx_token->length) + ctx_token->length;
 518         buf = malloc(buf_size);
 519         if (buf == NULL) {
 520                 logmsg(LL_ERR, "key %08x: can't alloc update buf: size %d\n",
 521                        keyid, buf_size);
 522                 return 1;
 523         }
 524
 525         p = buf;
 526         end = buf + buf_size;
 527         rc = -1;
 528
 529         if (WRITE_BYTES(&p, end, lnd->lnd_seq_win))
 530                 goto out;
 531         if (write_buffer(&p, end, &lnd->lnd_rmt_ctx))
 532                 goto out;
 533         if (write_buffer(&p, end, ctx_token))
 534                 goto out;
 535
 536 again:
 537         if (keyctl_update(keyid, buf, p - buf)) {
 538                 if (errno != EAGAIN) {
 539                         logmsg(LL_ERR, "update key %08x: %s\n",
 540                                keyid, strerror(errno));
 541                         goto out;
 542                 }
 543
 544                 logmsg(LL_DEBUG, "key %08x: updating too soon, try again\n",
 545                        keyid);
 546                 sleep(2);
 547                 goto again;
 548         }
 549
 550         rc = 0;
 551         logmsg(LL_DEBUG, "key %08x: updated\n", keyid);
 552 out:
 553         free(buf);
 554         return rc;
 555 }
 556
 557 static int lgssc_kr_negotiate_krb(key_serial_t keyid, struct lgss_cred *cred,
 558                                   struct keyring_upcall_param *kup)
 559 {
 560         struct lgss_nego_data lnd;
 561         OM_uint32 min_stat;
 562         int rc = -1;
 563
 564         memset(&lnd, 0, sizeof(lnd));
 565
 566         if (lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid)) {
 567                 logmsg(LL_ERR, "key %08x: failed to construct service "
 568                        "string\n", keyid);
 569                 error_kernel_key(keyid, -EACCES, 0);
 570                 goto out_cred;
 571         }
 572
 573         if (lgss_using_cred(cred)) {
 574                 logmsg(LL_ERR, "key %08x: can't using cred\n", keyid);
 575                 error_kernel_key(keyid, -EACCES, 0);
 576                 goto out_cred;
 577         }
 578
 579         if (lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n)) {
 580                 logmsg(LL_ERR, "key %08x: failed to initialize "
 581                        "negotiation data\n", keyid);
 582                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 583                 goto out_cred;
 584         }
 585
 586         rc = lgssc_negotiation(&lnd);
 587         if (rc) {
 588                 logmsg(LL_ERR, "key %08x: failed to negotiation\n", keyid);
 589                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 590                 goto out;
 591         }
 592
 593         rc = serialize_context_for_kernel(lnd.lnd_ctx, &lnd.lnd_ctx_token,
 594                                           lnd.lnd_mech);
 595         if (rc) {
 596                 logmsg(LL_ERR, "key %08x: failed to export context\n", keyid);
 597                 error_kernel_key(keyid, rc, lnd.lnd_gss_err);
 598                 goto out;
 599         }
 600
 601         rc = update_kernel_key(keyid,  &lnd, &lnd.lnd_ctx_token);
 602         if (rc)
 603                 goto out;
 604
 605         rc = 0;
 606         logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
 607                keyid, kup->kup_uid);
 608 out:
 609         if (lnd.lnd_ctx_token.length != 0)
 610                 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
 611
 612         lgssc_fini_nego_data(&lnd);
 613
 614 out_cred:
 615         lgss_release_cred(cred);
 616         return rc;
 617 }
 618
 619 static int lgssc_kr_negotiate_manual(key_serial_t keyid, struct lgss_cred *cred,
 620                                      struct keyring_upcall_param *kup)
 621 {
 622         struct lgss_nego_data   lnd;
 623         OM_uint32               min_stat;
 624         int                     rc;
 625
 626 retry:
 627         memset(&lnd, 0, sizeof(lnd));
 628
 629         rc = lgss_get_service_str(&g_service, kup->kup_svc, kup->kup_nid);
 630         if (rc) {
 631                 logmsg(LL_ERR, "key %08x: failed to construct service "
 632                        "string\n", keyid);
 633                 error_kernel_key(keyid, -EACCES, 0);
 634                 goto out_cred;
 635         }
 636
 637         rc = lgss_using_cred(cred);
 638         if (rc) {
 639                 logmsg(LL_ERR, "key %08x: can't use cred\n", keyid);
 640                 error_kernel_key(keyid, -EACCES, 0);
 641                 goto out_cred;
 642         }
 643
 644         rc = lgssc_init_nego_data(&lnd, kup, cred->lc_mech->lmt_mech_n);
 645         if (rc) {
 646                 logmsg(LL_ERR, "key %08x: failed to initialize "
 647                        "negotiation data\n", keyid);
 648                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 649                 goto out_cred;
 650         }
 651
 652         /*
 653          * Handles the negotiation but then calls lgss_validate to make sure
 654          * the token is valid.  It also populates the lnd_ctx_token for the
 655          * update to the kernel key
 656          */
 657         rc = lgssc_negotiation_manual(&lnd, cred);
 658         if (rc == -EAGAIN) {
 659                 logmsg(LL_ERR, "Failed negotiation must retry\n");
 660                 goto retry;
 661
 662         } else if (rc) {
 663                 logmsg(LL_ERR, "key %08x: failed to negotiate\n", keyid);
 664                 error_kernel_key(keyid, lnd.lnd_rpc_err, lnd.lnd_gss_err);
 665                 goto out;
 666         }
 667
 668         rc = update_kernel_key(keyid,  &lnd, &lnd.lnd_ctx_token);
 669         if (rc)
 670                 goto out;
 671
 672         logmsg(LL_INFO, "key %08x for user %u is updated OK!\n",
 673                keyid, kup->kup_uid);
 674 out:
 675         if (lnd.lnd_ctx_token.length != 0)
 676                 gss_release_buffer(&min_stat, &lnd.lnd_ctx_token);
 677
 678         lgssc_fini_nego_data(&lnd);
 679
 680 out_cred:
 681         lgss_release_cred(cred);
 682         return rc;
 683 }
 684
 685 /*
 686  * note we inherited assumed authority from parent process
 687  */
 688 static int lgssc_kr_negotiate(key_serial_t keyid, struct lgss_cred *cred,
 689                               struct keyring_upcall_param *kup)
 690 {
 691         int rc;
 692
 693         logmsg(LL_TRACE, "child start on behalf of key %08x: "
 694                "cred %p, uid %u, svc %u, nid %"PRIx64", uids: %u:%u/%u:%u\n",
 695                keyid, cred, cred->lc_uid, cred->lc_tgt_svc, cred->lc_tgt_nid,
 696                kup->kup_uid, kup->kup_gid, kup->kup_fsuid, kup->kup_fsgid);
 697
 698         switch (cred->lc_mech->lmt_mech_n) {
 699         case LGSS_MECH_NULL:
 700         case LGSS_MECH_SK:
 701                 rc = lgssc_kr_negotiate_manual(keyid, cred, kup);
 702                 break;
 703         case LGSS_MECH_KRB5:
 704         default:
 705                 rc = lgssc_kr_negotiate_krb(keyid, cred, kup);
 706                 break;
 707         }
 708
 709         return rc;
 710 }
 711
 712 /*
 713  * call out info format: s[:s]...
 714  *  [0]: secid          (uint)
 715  *  [1]: mech_name      (string)
 716  *  [2]: uid            (uint)
 717  *  [3]: gid            (uint)
 718  *  [4]: flags          (string) FMT: r-root; m-mdt; o-ost
 719  *  [5]: svc type       (char)
 720  *  [6]: lustre_svc     (int)
 721  *  [7]: target_nid     (uint64)
 722  *  [8]: target_uuid    (string)
 723  *  [9]: self_nid        (uint64)
 724  */
 725 static int parse_callout_info(const char *coinfo,
 726                               struct keyring_upcall_param *uparam)
 727 {
 728         const int       nargs = 10;
 729         char            buf[1024];
 730         char           *string = buf;
 731         int             length, i;
 732         char           *data[nargs];
 733         char           *pos;
 734
 735         length = strlen(coinfo) + 1;
 736         if (length > 1024) {
 737                 logmsg(LL_ERR, "coinfo too long\n");
 738                 return -1;
 739         }
 740         memcpy(buf, coinfo, length);
 741
 742         for (i = 0; i < nargs - 1; i++) {
 743                 pos = strchr(string, ':');
 744                 if (pos == NULL) {
 745                         logmsg(LL_ERR, "short of components\n");
 746                         return -1;
 747                 }
 748
 749                 *pos = '\0';
 750                 data[i] = string;
 751                 string = pos + 1;
 752         }
 753         data[i] = string;
 754
 755         logmsg(LL_TRACE, "components: %s,%s,%s,%s,%s,%c,%s,%s,%s,%s\n",
 756                data[0], data[1], data[2], data[3], data[4], data[5][0],
 757                data[6], data[7], data[8], data[9]);
 758
 759         uparam->kup_secid = strtol(data[0], NULL, 0);
 760         strlcpy(uparam->kup_mech, data[1], sizeof(uparam->kup_mech));
 761         uparam->kup_uid = strtol(data[2], NULL, 0);
 762         uparam->kup_gid = strtol(data[3], NULL, 0);
 763         if (strchr(data[4], 'r'))
 764                 uparam->kup_is_root = 1;
 765         if (strchr(data[4], 'm'))
 766                 uparam->kup_is_mdt = 1;
 767         if (strchr(data[4], 'o'))
 768                 uparam->kup_is_ost = 1;
 769         uparam->kup_svc_type = data[5][0];
 770         uparam->kup_svc = strtol(data[6], NULL, 0);
 771         uparam->kup_nid = strtoll(data[7], NULL, 0);
 772         strlcpy(uparam->kup_tgt, data[8], sizeof(uparam->kup_tgt));
 773         uparam->kup_selfnid = strtoll(data[9], NULL, 0);
 774
 775         logmsg(LL_DEBUG, "parse call out info: secid %d, mech %s, ugid %u:%u, "
 776                "is_root %d, is_mdt %d, is_ost %d, svc type %c, svc %d, "
 777                "nid 0x%"PRIx64", tgt %s, self nid 0x%"PRIx64"\n",
 778                uparam->kup_secid, uparam->kup_mech,
 779                uparam->kup_uid, uparam->kup_gid,
 780                uparam->kup_is_root, uparam->kup_is_mdt, uparam->kup_is_ost,
 781                uparam->kup_svc_type, uparam->kup_svc, uparam->kup_nid,
 782                uparam->kup_tgt, uparam->kup_selfnid);
 783         return 0;
 784 }
 785
 786 static void set_log_level()
 787 {
 788         unsigned int level;
 789         glob_t path;
 790         FILE *file;
 791
 792         if (cfs_get_param_paths(&path,
 793                                 "sptlrpc/gss/lgss_keyring/debug_level") != 0)
 794                 return;
 795         file = fopen(path.gl_pathv[0], "r");
 796         if (file == NULL) {
 797                 cfs_free_param_data(&path);
 798                 return;
 799         }
 800
 801         if (fscanf(file, "%u", &level) != 1)
 802                 goto out;
 803
 804         if (level >= LL_MAX)
 805                 goto out;
 806
 807         lgss_set_loglevel(level);
 808 out:
 809         cfs_free_param_data(&path);
 810         fclose(file);
 811 }
 812
 813 /****************************************
 814  * main process                         *
 815  ****************************************/
 816
 817 int main(int argc, char *argv[])
 818 {
 819         struct keyring_upcall_param     uparam;
 820         key_serial_t                    keyid;
 821         key_serial_t                    sring;
 822         key_serial_t                    inst_keyring;
 823         pid_t                           child;
 824         struct lgss_mech_type          *mech;
 825         struct lgss_cred               *cred;
 826
 827         set_log_level();
 828
 829         logmsg(LL_TRACE, "start parsing parameters\n");
 830         /*
 831          * parse & sanity check upcall parameters
 832          * expected to be called with:
 833          * [1]:  operation
 834          * [2]:  key ID
 835          * [3]:  key type
 836          * [4]:  key description
 837          * [5]:  call out info
 838          * [6]:  UID
 839          * [7]:  GID
 840          * [8]:  thread keyring
 841          * [9]:  process keyring
 842          * [10]: session keyring
 843          */
 844         if (argc != 10 + 1) {
 845                 logmsg(LL_ERR, "invalid parameter number %d\n", argc);
 846                 return 1;
 847         }
 848
 849         logmsg(LL_INFO, "key %s, desc %s, ugid %s:%s, sring %s, coinfo %s\n",
 850                argv[2], argv[4], argv[6], argv[7], argv[10], argv[5]);
 851
 852         memset(&uparam, 0, sizeof(uparam));
 853
 854         if (strcmp(argv[1], "create") != 0) {
 855                 logmsg(LL_ERR, "invalid OP %s\n", argv[1]);
 856                 return 1;
 857         }
 858
 859         if (sscanf(argv[2], "%d", &keyid) != 1) {
 860                 logmsg(LL_ERR, "can't extract KeyID: %s\n", argv[2]);
 861                 return 1;
 862         }
 863
 864         if (sscanf(argv[6], "%d", &uparam.kup_fsuid) != 1) {
 865                 logmsg(LL_ERR, "can't extract UID: %s\n", argv[6]);
 866                 return 1;
 867         }
 868
 869         if (sscanf(argv[7], "%d", &uparam.kup_fsgid) != 1) {
 870                 logmsg(LL_ERR, "can't extract GID: %s\n", argv[7]);
 871                 return 1;
 872         }
 873
 874         if (sscanf(argv[10], "%d", &sring) != 1) {
 875                 logmsg(LL_ERR, "can't extract session keyring: %s\n", argv[10]);
 876                 return 1;
 877         }
 878
 879         if (parse_callout_info(argv[5], &uparam)) {
 880                 logmsg(LL_ERR, "can't extract callout info: %s\n", argv[5]);
 881                 return 1;
 882         }
 883
 884         logmsg(LL_TRACE, "parsing parameters OK\n");
 885
 886         /*
 887          * prepare a cred
 888          */
 889         mech = lgss_name2mech(uparam.kup_mech);
 890         if (mech == NULL) {
 891                 logmsg(LL_ERR, "key %08x: unsupported mech: %s\n",
 892                        keyid, uparam.kup_mech);
 893                 return 1;
 894         }
 895
 896         if (lgss_mech_initialize(mech)) {
 897                 logmsg(LL_ERR, "key %08x: can't initialize mech %s\n",
 898                        keyid, mech->lmt_name);
 899                 return 1;
 900         }
 901
 902         cred = lgss_create_cred(mech);
 903         if (cred == NULL) {
 904                 logmsg(LL_ERR, "key %08x: can't create a new %s cred\n",
 905                        keyid, mech->lmt_name);
 906                 return 1;
 907         }
 908
 909         cred->lc_uid = uparam.kup_uid;
 910         cred->lc_root_flags |= uparam.kup_is_root ? LGSS_ROOT_CRED_ROOT : 0;
 911         cred->lc_root_flags |= uparam.kup_is_mdt ? LGSS_ROOT_CRED_MDT : 0;
 912         cred->lc_root_flags |= uparam.kup_is_ost ? LGSS_ROOT_CRED_OST : 0;
 913         cred->lc_tgt_nid = uparam.kup_nid;
 914         cred->lc_tgt_svc = uparam.kup_svc;
 915         cred->lc_tgt_uuid = uparam.kup_tgt;
 916         cred->lc_svc_type = uparam.kup_svc_type;
 917         cred->lc_self_nid = uparam.kup_selfnid;
 918
 919         if (lgss_prepare_cred(cred)) {
 920                 logmsg(LL_ERR, "key %08x: failed to prepare credentials "
 921                        "for user %d\n", keyid, uparam.kup_uid);
 922                 return 1;
 923         }
 924
 925         /* pre initialize the key. note the keyring linked to is actually of the
 926          * original requesting process, not _this_ upcall process. if it's for
 927          * root user, don't link to any keyrings because we want fully control
 928          * on it, and share it among all root sessions; otherswise link to
 929          * session keyring.
 930          */
 931         if (cred->lc_root_flags != 0)
 932                 inst_keyring = 0;
 933         else
 934                 inst_keyring = KEY_SPEC_SESSION_KEYRING;
 935
 936         if (keyctl_instantiate(keyid, NULL, 0, inst_keyring)) {
 937                 logmsg(LL_ERR, "instantiate key %08x: %s\n",
 938                        keyid, strerror(errno));
 939                 return 1;
 940         }
 941
 942         logmsg(LL_TRACE, "instantiated kernel key %08x\n", keyid);
 943
 944         /*
 945          * fork a child to do the real gss negotiation
 946          */
 947         child = fork();
 948         if (child == -1) {
 949                 logmsg(LL_ERR, "key %08x: can't create child: %s\n",
 950                        keyid, strerror(errno));
 951                 return 1;
 952         } else if (child == 0) {
 953                 return lgssc_kr_negotiate(keyid, cred, &uparam);
 954         }
 955
 956         logmsg(LL_TRACE, "forked child %d\n", child);
 957         return 0;
 958 }