4 Copyright (c) 2000 The Regents of the University of Michigan.
7 Copyright (c) 2002 Bruce Fields <bfields@UMICH.EDU>
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions
13 1. Redistributions of source code must retain the above copyright
14 notice, this list of conditions and the following disclaimer.
15 2. Redistributions in binary form must reproduce the above copyright
16 notice, this list of conditions and the following disclaimer in the
17 documentation and/or other materials provided with the distribution.
18 3. Neither the name of the University nor the names of its
19 contributors may be used to endorse or promote products derived
20 from this software without specific prior written permission.
22 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <sys/param.h>
55 extern char * mech2file(gss_OID mech);
56 #define SVCGSSD_CONTEXT_CHANNEL "/proc/net/rpc/auth.sptlrpc.context/channel"
57 #define SVCGSSD_INIT_CHANNEL "/proc/net/rpc/auth.sptlrpc.init/channel"
59 #define TOKEN_BUF_SIZE 8192
71 do_svc_downcall(gss_buffer_desc *out_handle, struct svc_cred *cred,
72 gss_OID mech, gss_buffer_desc *context_token)
78 printerr(2, "doing downcall\n");
79 if ((fname = mech2file(mech)) == NULL)
81 f = fopen(SVCGSSD_CONTEXT_CHANNEL, "w");
83 printerr(0, "WARNING: unable to open downcall channel "
85 SVCGSSD_CONTEXT_CHANNEL, strerror(errno));
88 qword_printhex(f, out_handle->value, out_handle->length);
89 /* XXX are types OK for the rest of this? */
90 qword_printint(f, 0x7fffffff); /*XXX need a better timeout */
91 qword_printint(f, cred->cr_remote);
92 qword_printint(f, cred->cr_usr_root);
93 qword_printint(f, cred->cr_usr_mds);
94 qword_printint(f, cred->cr_mapped_uid);
95 qword_printint(f, cred->cr_uid);
96 qword_printint(f, cred->cr_gid);
97 qword_print(f, fname);
98 qword_printhex(f, context_token->value, context_token->length);
103 printerr(0, "WARNING: downcall failed\n");
107 struct gss_verifier {
109 gss_buffer_desc body;
112 #define RPCSEC_GSS_SEQ_WIN 5
115 send_response(FILE *f, gss_buffer_desc *in_handle, gss_buffer_desc *in_token,
116 u_int32_t maj_stat, u_int32_t min_stat,
117 gss_buffer_desc *out_handle, gss_buffer_desc *out_token)
119 char buf[2 * TOKEN_BUF_SIZE];
121 int blen = sizeof(buf);
125 printerr(2, "sending null reply\n");
127 qword_addhex(&bp, &blen, in_handle->value, in_handle->length);
128 qword_addhex(&bp, &blen, in_token->value, in_token->length);
129 qword_addint(&bp, &blen, 0x7fffffff); /*XXX need a better timeout */
130 qword_adduint(&bp, &blen, maj_stat);
131 qword_adduint(&bp, &blen, min_stat);
132 qword_addhex(&bp, &blen, out_handle->value, out_handle->length);
133 qword_addhex(&bp, &blen, out_token->value, out_token->length);
134 qword_addeol(&bp, &blen);
136 printerr(0, "WARNING: send_respsonse: message too long\n");
139 g = open(SVCGSSD_INIT_CHANNEL, O_WRONLY);
141 printerr(0, "WARNING: open %s failed: %s\n",
142 SVCGSSD_INIT_CHANNEL, strerror(errno));
146 printerr(3, "writing message: %s", buf);
147 if (write(g, buf, bp - buf) == -1) {
148 printerr(0, "WARNING: failed to write message\n");
156 #define rpc_auth_ok 0
157 #define rpc_autherr_badcred 1
158 #define rpc_autherr_rejectedcred 2
159 #define rpc_autherr_badverf 3
160 #define rpc_autherr_rejectedverf 4
161 #define rpc_autherr_tooweak 5
162 #define rpcsec_gsserr_credproblem 13
163 #define rpcsec_gsserr_ctxproblem 14
167 add_supplementary_groups(char *secname, char *name, struct svc_cred *cred)
170 static gid_t *groups = NULL;
172 cred->cr_ngroups = NGROUPS;
173 ret = nfs4_gss_princ_to_grouplist(secname, name,
174 cred->cr_groups, &cred->cr_ngroups);
176 groups = realloc(groups, cred->cr_ngroups*sizeof(gid_t));
177 ret = nfs4_gss_princ_to_grouplist(secname, name,
178 groups, &cred->cr_ngroups);
180 cred->cr_ngroups = 0;
182 if (cred->cr_ngroups > NGROUPS)
183 cred->cr_ngroups = NGROUPS;
184 memcpy(cred->cr_groups, groups,
185 cred->cr_ngroups*sizeof(gid_t));
193 get_ids(gss_name_t client_name, gss_OID mech, struct svc_cred *cred)
195 u_int32_t maj_stat, min_stat;
196 gss_buffer_desc name;
200 gss_OID name_type = GSS_C_NO_OID;
203 maj_stat = gss_display_name(&min_stat, client_name, &name, &name_type);
204 if (maj_stat != GSS_S_COMPLETE) {
205 pgsserr("get_ids: gss_display_name",
206 maj_stat, min_stat, mech);
209 if (name.length >= 0xffff || /* be certain name.length+1 doesn't overflow */
210 !(sname = calloc(name.length + 1, 1))) {
211 printerr(0, "WARNING: get_ids: error allocating %d bytes "
212 "for sname\n", name.length + 1);
213 gss_release_buffer(&min_stat, &name);
216 memcpy(sname, name.value, name.length);
217 printerr(1, "sname = %s\n", sname);
218 gss_release_buffer(&min_stat, &name);
221 if ((secname = mech2file(mech)) == NULL) {
222 printerr(0, "WARNING: get_ids: error mapping mech to "
223 "file for name '%s'\n", sname);
226 nfs4_init_name_mapping(NULL); /* XXX: should only do this once */
227 res = nfs4_gss_princ_to_ids(secname, sname, &uid, &gid);
230 * -ENOENT means there was no mapping, any other error
231 * value means there was an error trying to do the
233 * If there was no mapping, we send down the value -1
234 * to indicate that the anonuid/anongid for the export
237 if (res == -ENOENT) {
240 cred->cr_ngroups = 0;
244 printerr(0, "WARNING: get_ids: failed to map name '%s' "
245 "to uid/gid: %s\n", sname, strerror(-res));
250 add_supplementary_groups(secname, sname, cred);
261 print_hexl(int pri, unsigned char *cp, int length)
266 printerr(pri, "length %d\n",length);
269 for (i = 0; i < length; i += 0x10) {
270 printerr(pri, " %04x: ", (u_int)i);
272 jm = jm > 16 ? 16 : jm;
274 for (j = 0; j < jm; j++) {
276 printerr(pri,"%02x ", (u_int)cp[i+j]);
278 printerr(pri,"%02x", (u_int)cp[i+j]);
280 for (; j < 16; j++) {
288 for (j = 0; j < jm; j++) {
290 c = isprint(c) ? c : '.';
291 printerr(pri,"%c", c);
299 get_ids(gss_name_t client_name, gss_OID mech, struct svc_cred *cred,
300 lnet_nid_t nid, uint32_t lustre_svc)
302 u_int32_t maj_stat, min_stat;
303 gss_buffer_desc name;
304 char *sname, *host, *realm;
305 const int namebuf_size = 512;
306 char namebuf[namebuf_size];
308 gss_OID name_type = GSS_C_NO_OID;
311 cred->cr_remote = cred->cr_usr_root = cred->cr_usr_mds = 0;
312 cred->cr_uid = cred->cr_mapped_uid = cred->cr_gid = -1;
314 maj_stat = gss_display_name(&min_stat, client_name, &name, &name_type);
315 if (maj_stat != GSS_S_COMPLETE) {
316 pgsserr("get_ids: gss_display_name",
317 maj_stat, min_stat, mech);
320 if (name.length >= 0xffff || /* be certain name.length+1 doesn't overflow */
321 !(sname = calloc(name.length + 1, 1))) {
322 printerr(0, "WARNING: get_ids: error allocating %d bytes "
323 "for sname\n", name.length + 1);
324 gss_release_buffer(&min_stat, &name);
327 memcpy(sname, name.value, name.length);
328 gss_release_buffer(&min_stat, &name);
330 if (lustre_svc == LUSTRE_GSS_SVC_MDS)
331 lookup_mapping(sname, nid, &cred->cr_mapped_uid);
333 cred->cr_mapped_uid = -1;
335 realm = strchr(sname, '@');
339 host = strchr(sname, '/');
343 if (strcmp(sname, GSSD_SERVICE_OSS) == 0) {
344 printerr(0, "forbid "GSSD_SERVICE_OSS" as user name\n");
348 /* 1. check host part */
350 if (lnet_nid2hostname(nid, namebuf, namebuf_size)) {
351 printerr(0, "ERROR: failed to resolve hostname for "
352 "%s/%s@%s from %016llx\n",
353 sname, host, realm, nid);
357 if (strcasecmp(host, namebuf)) {
358 printerr(0, "ERROR: %s/%s@s claimed hostname doesn't "
359 "match %s, nid %016llx\n", sname, host, realm,
364 if (!strcmp(sname, GSSD_SERVICE_MDS)) {
365 printerr(0, "ERROR: "GSSD_SERVICE_MDS"@%s from %016llx "
366 "doesn't bind with hostname\n",
367 realm ? realm : "", nid);
375 cred->cr_remote = (mds_local_realm != NULL);
377 printerr(0, "ERROR: %s%s%s have no realm name\n",
378 sname, host ? "/" : "", host ? "host" : "");
382 if (!mds_local_realm || strcasecmp(mds_local_realm, realm)) {
385 if (cred->cr_mapped_uid == -1)
386 printerr(0, "ERROR: %s from %016llx is remote but "
387 "without mapping\n", sname, nid);
388 /* mapped, skip user checking */
393 if (!(pw = getpwnam(sname))) {
394 /* map lustre_root/lustre_mds to root user, which is subject
395 * to further mapping by root-squash in kernel. */
396 if (!strcmp(sname, LUSTRE_ROOT_NAME)) {
398 cred->cr_usr_root = 1;
399 } else if (!strcmp(sname, GSSD_SERVICE_MDS)) {
401 cred->cr_usr_mds = 1;
403 if (cred->cr_mapped_uid == -1) {
404 printerr(0, "ERROR: invalid user, %s/%s@%s "
405 "from %016llx\n", sname, host,
410 printerr(2, "user %s from %016llx is mapped to %u\n",
411 sname, nid, cred->cr_mapped_uid);
413 /* note: a mapped local user will go to here too */
414 cred->cr_uid = pw->pw_uid;
415 printerr(2, "%s resolve to uid %u\n", sname, cred->cr_uid);
418 printerr(1, "%s: authenticated %s%s%s@%s from %016llx\n",
419 lustre_svc_name[lustre_svc], sname,
420 host ? "/" : "", host ? host : "", realm, nid);
427 typedef struct gss_union_ctx_id_t {
429 gss_ctx_id_t internal_ctx_id;
430 } gss_union_ctx_id_desc, *gss_union_ctx_id_t;
433 * return -1 only if we detect error during reading from upcall channel,
434 * all other cases return 0.
437 handle_nullreq(FILE *f) {
439 char in_tok_buf[TOKEN_BUF_SIZE];
440 char in_handle_buf[15];
441 char out_handle_buf[15];
442 gss_buffer_desc in_tok = {.value = in_tok_buf},
443 out_tok = {.value = NULL},
444 in_handle = {.value = in_handle_buf},
445 out_handle = {.value = out_handle_buf},
446 ctx_token = {.value = NULL},
447 ignore_out_tok = {.value = NULL},
448 /* XXX isn't there a define for this?: */
449 null_token = {.value = NULL};
453 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
454 gss_name_t client_name;
455 gss_OID mech = GSS_C_NO_OID;
456 gss_cred_id_t svc_cred;
457 u_int32_t maj_stat = GSS_S_FAILURE, min_stat = 0;
458 u_int32_t ignore_min_stat;
459 struct svc_cred cred;
460 static char *lbuf = NULL;
461 static int lbuflen = 0;
464 printerr(2, "handling null request\n");
466 if (readline(fileno(f), &lbuf, &lbuflen) != 1) {
467 printerr(0, "WARNING: handle_nullreq: "
468 "failed reading request\n");
474 qword_get(&cp, (char *) &lustre_svc, sizeof(lustre_svc));
475 qword_get(&cp, (char *) &nid, sizeof(nid));
476 qword_get(&cp, (char *) &handle_seq, sizeof(handle_seq));
477 printerr(2, "handling req: svc %u, nid %016llx, idx %llx\n",
478 lustre_svc, nid, handle_seq);
480 in_handle.length = (size_t) qword_get(&cp, in_handle.value,
481 sizeof(in_handle_buf));
482 printerr(3, "in_handle: \n");
483 print_hexl(3, in_handle.value, in_handle.length);
485 in_tok.length = (size_t) qword_get(&cp, in_tok.value,
487 printerr(3, "in_tok: \n");
488 print_hexl(3, in_tok.value, in_tok.length);
490 if (in_tok.length < 0) {
491 printerr(0, "WARNING: handle_nullreq: "
492 "failed parsing request\n");
496 if (in_handle.length != 0) { /* CONTINUE_INIT case */
497 if (in_handle.length != sizeof(ctx)) {
498 printerr(0, "WARNING: handle_nullreq: "
499 "input handle has unexpected length %d\n",
503 /* in_handle is the context id stored in the out_handle
504 * for the GSS_S_CONTINUE_NEEDED case below. */
505 memcpy(&ctx, in_handle.value, in_handle.length);
508 svc_cred = gssd_select_svc_cred(lustre_svc);
510 printerr(0, "no service credential for svc %u\n", lustre_svc);
514 maj_stat = gss_accept_sec_context(&min_stat, &ctx, svc_cred,
515 &in_tok, GSS_C_NO_CHANNEL_BINDINGS, &client_name,
516 &mech, &out_tok, &ret_flags, NULL, NULL);
518 if (maj_stat == GSS_S_CONTINUE_NEEDED) {
519 printerr(1, "gss_accept_sec_context GSS_S_CONTINUE_NEEDED\n");
521 /* Save the context handle for future calls */
522 out_handle.length = sizeof(ctx);
523 memcpy(out_handle.value, &ctx, sizeof(ctx));
524 goto continue_needed;
526 else if (maj_stat != GSS_S_COMPLETE) {
527 printerr(0, "WARNING: gss_accept_sec_context failed\n");
528 pgsserr("handle_nullreq: gss_accept_sec_context",
529 maj_stat, min_stat, mech);
533 if (get_ids(client_name, mech, &cred, nid, lustre_svc)) {
534 /* get_ids() prints error msg */
535 maj_stat = GSS_S_BAD_NAME; /* XXX ? */
536 gss_release_name(&ignore_min_stat, &client_name);
539 gss_release_name(&ignore_min_stat, &client_name);
541 /* Context complete. Pass handle_seq in out_handle to use
542 * for context lookup in the kernel. */
543 out_handle.length = sizeof(handle_seq);
544 memcpy(out_handle.value, &handle_seq, sizeof(handle_seq));
546 /* kernel needs ctx to calculate verifier on null response, so
547 * must give it context before doing null call: */
548 if (serialize_context_for_kernel(ctx, &ctx_token, mech)) {
549 printerr(0, "WARNING: handle_nullreq: "
550 "serialize_context_for_kernel failed\n");
551 maj_stat = GSS_S_FAILURE;
554 /* We no longer need the gss context */
555 gss_delete_sec_context(&ignore_min_stat, &ctx, &ignore_out_tok);
557 do_svc_downcall(&out_handle, &cred, mech, &ctx_token);
559 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
560 &out_handle, &out_tok);
562 if (ctx_token.value != NULL)
563 free(ctx_token.value);
564 if (out_tok.value != NULL)
565 gss_release_buffer(&ignore_min_stat, &out_tok);
569 if (ctx != GSS_C_NO_CONTEXT)
570 gss_delete_sec_context(&ignore_min_stat, &ctx, &ignore_out_tok);
571 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
572 &null_token, &null_token);