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.rpcsec.context/channel"
57 #define SVCGSSD_INIT_CHANNEL "/proc/net/rpc/auth.rpcsec.init/channel"
59 #define TOKEN_BUF_SIZE 8192
65 gid_t cr_groups[NGROUPS];
69 do_svc_downcall(gss_buffer_desc *out_handle, struct svc_cred *cred,
70 gss_OID mech, gss_buffer_desc *context_token)
76 printerr(1, "doing downcall\n");
77 if ((fname = mech2file(mech)) == NULL)
79 f = fopen(SVCGSSD_CONTEXT_CHANNEL, "w");
81 printerr(0, "WARNING: unable to open downcall channel "
83 SVCGSSD_CONTEXT_CHANNEL, strerror(errno));
86 qword_printhex(f, out_handle->value, out_handle->length);
87 /* XXX are types OK for the rest of this? */
88 qword_printint(f, 0x7fffffff); /*XXX need a better timeout */
89 qword_printint(f, cred->cr_uid);
90 qword_printint(f, cred->cr_gid);
91 qword_printint(f, cred->cr_ngroups);
92 for (i=0; i < cred->cr_ngroups; i++)
93 qword_printint(f, cred->cr_groups[i]);
94 qword_print(f, fname);
95 qword_printhex(f, context_token->value, context_token->length);
100 printerr(0, "WARNING: downcall failed\n");
104 struct gss_verifier {
106 gss_buffer_desc body;
109 #define RPCSEC_GSS_SEQ_WIN 5
112 send_response(FILE *f, gss_buffer_desc *in_handle, gss_buffer_desc *in_token,
113 u_int32_t maj_stat, u_int32_t min_stat,
114 gss_buffer_desc *out_handle, gss_buffer_desc *out_token)
116 char buf[2 * TOKEN_BUF_SIZE];
118 int blen = sizeof(buf);
122 printerr(1, "sending null reply\n");
124 qword_addhex(&bp, &blen, in_handle->value, in_handle->length);
125 qword_addhex(&bp, &blen, in_token->value, in_token->length);
126 qword_addint(&bp, &blen, 0x7fffffff); /*XXX need a better timeout */
127 qword_addint(&bp, &blen, maj_stat);
128 qword_addint(&bp, &blen, min_stat);
129 qword_addhex(&bp, &blen, out_handle->value, out_handle->length);
130 qword_addhex(&bp, &blen, out_token->value, out_token->length);
131 qword_addeol(&bp, &blen);
133 printerr(0, "WARNING: send_respsonse: message too long\n");
136 g = open(SVCGSSD_INIT_CHANNEL, O_WRONLY);
138 printerr(0, "WARNING: open %s failed: %s\n",
139 SVCGSSD_INIT_CHANNEL, strerror(errno));
143 printerr(1, "writing message: %s", buf);
144 if (write(g, buf, bp - buf) == -1) {
145 printerr(0, "WARNING: failed to write message\n");
153 #define rpc_auth_ok 0
154 #define rpc_autherr_badcred 1
155 #define rpc_autherr_rejectedcred 2
156 #define rpc_autherr_badverf 3
157 #define rpc_autherr_rejectedverf 4
158 #define rpc_autherr_tooweak 5
159 #define rpcsec_gsserr_credproblem 13
160 #define rpcsec_gsserr_ctxproblem 14
163 add_supplementary_groups(char *secname, char *name, struct svc_cred *cred)
166 static gid_t *groups = NULL;
168 cred->cr_ngroups = NGROUPS;
169 ret = nfs4_gss_princ_to_grouplist(secname, name,
170 cred->cr_groups, &cred->cr_ngroups);
172 groups = realloc(groups, cred->cr_ngroups*sizeof(gid_t));
173 ret = nfs4_gss_princ_to_grouplist(secname, name,
174 groups, &cred->cr_ngroups);
176 cred->cr_ngroups = 0;
178 if (cred->cr_ngroups > NGROUPS)
179 cred->cr_ngroups = NGROUPS;
180 memcpy(cred->cr_groups, groups,
181 cred->cr_ngroups*sizeof(gid_t));
187 get_ids(gss_name_t client_name, gss_OID mech, struct svc_cred *cred)
189 u_int32_t maj_stat, min_stat;
190 gss_buffer_desc name;
194 gss_OID name_type = GSS_C_NO_OID;
197 maj_stat = gss_display_name(&min_stat, client_name, &name, &name_type);
198 if (maj_stat != GSS_S_COMPLETE) {
199 pgsserr("get_ids: gss_display_name",
200 maj_stat, min_stat, mech);
203 if (!(sname = calloc(name.length + 1, 1))) {
204 printerr(0, "WARNING: get_ids: error allocating %d bytes "
205 "for sname\n", name.length + 1);
206 gss_release_buffer(&min_stat, &name);
209 memcpy(sname, name.value, name.length);
210 printerr(1, "sname = %s\n", sname);
211 gss_release_buffer(&min_stat, &name);
214 if ((secname = mech2file(mech)) == NULL) {
215 printerr(0, "WARNING: get_ids: error mapping mech to "
216 "file for name '%s'\n", sname);
219 nfs4_init_name_mapping(NULL); /* XXX: should only do this once */
220 res = nfs4_gss_princ_to_ids(secname, sname, &uid, &gid);
222 printerr(0, "WARNING: get_ids: unable to map "
223 "name '%s' to a uid\n", sname);
228 add_supplementary_groups(secname, sname, cred);
237 print_hexl(int pri, unsigned char *cp, int length)
242 printerr(pri, "length %d\n",length);
245 for (i = 0; i < length; i += 0x10) {
246 printerr(pri, " %04x: ", (u_int)i);
248 jm = jm > 16 ? 16 : jm;
250 for (j = 0; j < jm; j++) {
252 printerr(pri,"%02x ", (u_int)cp[i+j]);
254 printerr(pri,"%02x", (u_int)cp[i+j]);
256 for (; j < 16; j++) {
264 for (j = 0; j < jm; j++) {
266 c = isprint(c) ? c : '.';
267 printerr(pri,"%c", c);
274 handle_nullreq(FILE *f) {
275 /* XXX initialize to a random integer to reduce chances of unnecessary
276 * invalidation of existing ctx's on restarting svcgssd. */
277 static u_int32_t handle_seq = 0;
278 char in_tok_buf[TOKEN_BUF_SIZE];
279 char in_handle_buf[15];
280 char out_handle_buf[15];
281 gss_buffer_desc in_tok = {.value = in_tok_buf},
282 out_tok = {.value = NULL},
283 in_handle = {.value = in_handle_buf},
284 out_handle = {.value = out_handle_buf},
285 ctx_token = {.value = NULL},
286 ignore_out_tok = {.value = NULL},
287 /* XXX isn't there a define for this?: */
288 null_token = {.value = NULL};
290 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
291 gss_name_t client_name;
292 gss_OID mech = GSS_C_NO_OID;
293 u_int32_t maj_stat = GSS_S_FAILURE, min_stat = 0;
294 u_int32_t ignore_min_stat;
295 struct svc_cred cred;
296 static char *lbuf = NULL;
297 static int lbuflen = 0;
300 printerr(1, "handling null request\n");
302 if (readline(fileno(f), &lbuf, &lbuflen) != 1) {
303 printerr(0, "WARNING: handle_nullreq: "
304 "failed reading request\n");
310 in_handle.length = (size_t) qword_get(&cp, in_handle.value,
311 sizeof(in_handle_buf));
312 printerr(2, "in_handle: \n");
313 print_hexl(2, in_handle.value, in_handle.length);
315 in_tok.length = (size_t) qword_get(&cp, in_tok.value,
317 printerr(2, "in_tok: \n");
318 print_hexl(2, in_tok.value, in_tok.length);
320 if (in_tok.length < 0) {
321 printerr(0, "WARNING: handle_nullreq: "
322 "failed parsing request\n");
326 if (in_handle.length != 0) { /* CONTINUE_INIT case */
327 if (in_handle.length != sizeof(ctx)) {
328 printerr(0, "WARNING: handle_nullreq: "
329 "input handle has unexpected length %d\n",
333 /* in_handle is the context id stored in the out_handle
334 * for the GSS_S_CONTINUE_NEEDED case below. */
335 memcpy(&ctx, in_handle.value, in_handle.length);
338 maj_stat = gss_accept_sec_context(&min_stat, &ctx, gssd_creds,
339 &in_tok, GSS_C_NO_CHANNEL_BINDINGS, &client_name,
340 &mech, &out_tok, &ret_flags, NULL, NULL);
342 if (maj_stat == GSS_S_CONTINUE_NEEDED) {
343 printerr(1, "gss_accept_sec_context GSS_S_CONTINUE_NEEDED\n");
345 /* Save the context handle for future calls */
346 out_handle.length = sizeof(ctx);
347 memcpy(out_handle.value, &ctx, sizeof(ctx));
348 goto continue_needed;
350 else if (maj_stat != GSS_S_COMPLETE) {
351 printerr(0, "WARNING: gss_accept_sec_context failed\n");
352 pgsserr("handle_nullreq: gss_accept_sec_context",
353 maj_stat, min_stat, mech);
356 if (get_ids(client_name, mech, &cred)) {
357 /* get_ids() prints error msg */
358 maj_stat = GSS_S_BAD_NAME; /* XXX ? */
359 gss_release_name(&ignore_min_stat, &client_name);
362 gss_release_name(&ignore_min_stat, &client_name);
365 /* Context complete. Pass handle_seq in out_handle to use
366 * for context lookup in the kernel. */
368 out_handle.length = sizeof(handle_seq);
369 memcpy(out_handle.value, &handle_seq, sizeof(handle_seq));
371 /* kernel needs ctx to calculate verifier on null response, so
372 * must give it context before doing null call: */
373 if (serialize_context_for_kernel(ctx, &ctx_token, mech)) {
374 printerr(0, "WARNING: handle_nullreq: "
375 "serialize_context_for_kernel failed\n");
376 maj_stat = GSS_S_FAILURE;
379 /* We no longer need the gss context */
380 gss_delete_sec_context(&ignore_min_stat, &ctx, &ignore_out_tok);
382 do_svc_downcall(&out_handle, &cred, mech, &ctx_token);
384 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
385 &out_handle, &out_tok);
387 if (ctx_token.value != NULL)
388 free(ctx_token.value);
389 if (out_tok.value != NULL)
390 gss_release_buffer(&ignore_min_stat, &out_tok);
391 printerr(1, "finished handling null request\n");
395 if (ctx != GSS_C_NO_CONTEXT)
396 gss_delete_sec_context(&ignore_min_stat, &ctx, &ignore_out_tok);
397 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
398 &null_token, &null_token);