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;
198 maj_stat = gss_display_name(&min_stat, client_name, &name, &name_type);
199 if (maj_stat != GSS_S_COMPLETE) {
200 pgsserr("get_ids: gss_display_name",
201 maj_stat, min_stat, mech);
204 if (!(sname = calloc(name.length + 1, 1))) {
205 printerr(0, "WARNING: get_ids: error allocating %d bytes "
206 "for sname\n", name.length + 1);
209 memcpy(sname, name.value, name.length);
210 printerr(1, "sname = %s\n", sname);
213 if ((secname = mech2file(mech)) == NULL) {
214 printerr(0, "WARNING: get_ids: error mapping mech to "
215 "file for name '%s'\n", sname);
218 nfs4_init_name_mapping(NULL); /* XXX: should only do this once */
219 res = nfs4_gss_princ_to_ids(secname, sname, &uid, &gid);
221 printerr(0, "WARNING: get_ids: unable to map "
222 "name '%s' to a uid\n", sname);
227 add_supplementary_groups(secname, sname, cred);
236 print_hexl(int pri, unsigned char *cp, int length)
241 printerr(pri, "length %d\n",length);
244 for (i = 0; i < length; i += 0x10) {
245 printerr(pri, " %04x: ", (u_int)i);
247 jm = jm > 16 ? 16 : jm;
249 for (j = 0; j < jm; j++) {
251 printerr(pri,"%02x ", (u_int)cp[i+j]);
253 printerr(pri,"%02x", (u_int)cp[i+j]);
255 for (; j < 16; j++) {
263 for (j = 0; j < jm; j++) {
265 c = isprint(c) ? c : '.';
266 printerr(pri,"%c", c);
273 handle_nullreq(FILE *f) {
274 /* XXX initialize to a random integer to reduce chances of unnecessary
275 * invalidation of existing ctx's on restarting svcgssd. */
276 static u_int32_t handle_seq = 0;
277 char in_tok_buf[TOKEN_BUF_SIZE];
278 char in_handle_buf[15];
279 char out_handle_buf[15];
280 gss_buffer_desc in_tok = {.value = in_tok_buf},
281 out_tok = {.value = NULL},
282 in_handle = {.value = in_handle_buf},
283 out_handle = {.value = out_handle_buf},
284 ctx_token = {.value = NULL},
285 /* XXX isn't there a define for this?: */
286 null_token = {.value = NULL};
288 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
289 gss_name_t client_name;
290 gss_OID mech = GSS_C_NO_OID;
291 u_int32_t maj_stat = GSS_S_FAILURE, min_stat = 0;
292 struct svc_cred cred;
293 static char *lbuf = NULL;
294 static int lbuflen = 0;
297 printerr(1, "handling null request\n");
299 if (readline(fileno(f), &lbuf, &lbuflen) != 1) {
300 printerr(0, "WARNING: handle_nullreq: "
301 "failed reading request\n");
307 in_handle.length = (size_t) qword_get(&cp, in_handle.value,
308 sizeof(in_handle_buf));
309 printerr(2, "in_handle: \n");
310 print_hexl(2, in_handle.value, in_handle.length);
312 in_tok.length = (size_t) qword_get(&cp, in_tok.value,
314 printerr(2, "in_tok: \n");
315 print_hexl(2, in_tok.value, in_tok.length);
317 if (in_tok.length < 0) {
318 printerr(0, "WARNING: handle_nullreq: "
319 "failed parsing request\n");
323 if (in_handle.length != 0) { /* CONTINUE_INIT case */
324 if (in_handle.length != sizeof(ctx)) {
325 printerr(0, "WARNING: handle_nullreq: "
326 "input handle has unexpected length %d\n",
330 /* in_handle is the context id stored in the out_handle
331 * for the GSS_S_CONTINUE_NEEDED case below. */
332 memcpy(&ctx, in_handle.value, in_handle.length);
335 maj_stat = gss_accept_sec_context(&min_stat, &ctx, gssd_creds,
336 &in_tok, GSS_C_NO_CHANNEL_BINDINGS, &client_name,
337 &mech, &out_tok, &ret_flags, NULL, NULL);
339 if (maj_stat == GSS_S_CONTINUE_NEEDED) {
340 printerr(1, "gss_accept_sec_context GSS_S_CONTINUE_NEEDED\n");
342 /* Save the context handle for future calls */
343 out_handle.length = sizeof(ctx);
344 memcpy(out_handle.value, &ctx, sizeof(ctx));
345 goto continue_needed;
347 else if (maj_stat != GSS_S_COMPLETE) {
348 printerr(0, "WARNING: gss_accept_sec_context failed\n");
349 pgsserr("handle_nullreq: gss_accept_sec_context",
350 maj_stat, min_stat, mech);
353 if (get_ids(client_name, mech, &cred)) {
354 /* get_ids() prints error msg */
355 maj_stat = GSS_S_BAD_NAME; /* XXX ? */
360 /* Context complete. Pass handle_seq in out_handle to use
361 * for context lookup in the kernel. */
363 out_handle.length = sizeof(handle_seq);
364 memcpy(out_handle.value, &handle_seq, sizeof(handle_seq));
366 /* kernel needs ctx to calculate verifier on null response, so
367 * must give it context before doing null call: */
368 if (serialize_context_for_kernel(ctx, &ctx_token)) {
369 printerr(0, "WARNING: handle_nullreq: "
370 "serialize_context_for_kernel failed\n");
371 maj_stat = GSS_S_FAILURE;
374 do_svc_downcall(&out_handle, &cred, mech, &ctx_token);
376 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
377 &out_handle, &out_tok);
379 if (ctx_token.value != NULL)
380 free(ctx_token.value);
381 printerr(1, "finished handling null request\n");
385 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
386 &null_token, &null_token);