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);
208 memcpy(sname, name.value, name.length);
209 printerr(1, "sname = %s\n", sname);
212 if ((secname = mech2file(mech)) == NULL) {
213 printerr(0, "WARNING: get_ids: error mapping mech to "
214 "file for name '%s'\n", sname);
217 nfs4_init_name_mapping(NULL); /* XXX: should only do this once */
218 res = nfs4_gss_princ_to_ids(secname, sname, &uid, &gid);
220 printerr(0, "WARNING: get_ids: unable to map "
221 "name '%s' to a uid\n", sname);
226 add_supplementary_groups(secname, sname, cred);
235 print_hexl(int pri, unsigned char *cp, int length)
240 printerr(pri, "length %d\n",length);
243 for (i = 0; i < length; i += 0x10) {
244 printerr(pri, " %04x: ", (u_int)i);
246 jm = jm > 16 ? 16 : jm;
248 for (j = 0; j < jm; j++) {
250 printerr(pri,"%02x ", (u_int)cp[i+j]);
252 printerr(pri,"%02x", (u_int)cp[i+j]);
254 for (; j < 16; j++) {
262 for (j = 0; j < jm; j++) {
264 c = isprint(c) ? c : '.';
265 printerr(pri,"%c", c);
272 handle_nullreq(FILE *f) {
273 /* XXX initialize to a random integer to reduce chances of unnecessary
274 * invalidation of existing ctx's on restarting svcgssd. */
275 static u_int32_t handle_seq = 0;
276 char in_tok_buf[TOKEN_BUF_SIZE];
277 char in_handle_buf[15];
278 char out_handle_buf[15];
279 gss_buffer_desc in_tok = {.value = in_tok_buf},
280 out_tok = {.value = NULL},
281 in_handle = {.value = in_handle_buf},
282 out_handle = {.value = out_handle_buf},
283 ctx_token = {.value = NULL},
284 /* XXX isn't there a define for this?: */
285 null_token = {.value = NULL};
287 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
288 gss_name_t client_name;
289 gss_OID mech = GSS_C_NO_OID;
290 u_int32_t maj_stat = GSS_S_FAILURE, min_stat = 0;
291 struct svc_cred cred;
292 static char *lbuf = NULL;
293 static int lbuflen = 0;
296 printerr(1, "handling null request\n");
298 if (readline(fileno(f), &lbuf, &lbuflen) != 1) {
299 printerr(0, "WARNING: handle_nullreq: "
300 "failed reading request\n");
306 in_handle.length = (size_t) qword_get(&cp, in_handle.value,
307 sizeof(in_handle_buf));
308 printerr(2, "in_handle: \n");
309 print_hexl(2, in_handle.value, in_handle.length);
311 in_tok.length = (size_t) qword_get(&cp, in_tok.value,
313 printerr(2, "in_tok: \n");
314 print_hexl(2, in_tok.value, in_tok.length);
316 if (in_tok.length < 0) {
317 printerr(0, "WARNING: handle_nullreq: "
318 "failed parsing request\n");
322 if (in_handle.length != 0) { /* CONTINUE_INIT case */
323 if (in_handle.length != sizeof(ctx)) {
324 printerr(0, "WARNING: handle_nullreq: "
325 "input handle has unexpected length %d\n",
329 /* in_handle is the context id stored in the out_handle
330 * for the GSS_S_CONTINUE_NEEDED case below. */
331 memcpy(&ctx, in_handle.value, in_handle.length);
334 maj_stat = gss_accept_sec_context(&min_stat, &ctx, gssd_creds,
335 &in_tok, GSS_C_NO_CHANNEL_BINDINGS, &client_name,
336 &mech, &out_tok, &ret_flags, NULL, NULL);
338 if (maj_stat == GSS_S_CONTINUE_NEEDED) {
339 printerr(1, "gss_accept_sec_context GSS_S_CONTINUE_NEEDED\n");
341 /* Save the context handle for future calls */
342 out_handle.length = sizeof(ctx);
343 memcpy(out_handle.value, &ctx, sizeof(ctx));
344 goto continue_needed;
346 else if (maj_stat != GSS_S_COMPLETE) {
347 printerr(0, "WARNING: gss_accept_sec_context failed\n");
348 pgsserr("handle_nullreq: gss_accept_sec_context",
349 maj_stat, min_stat, mech);
352 if (get_ids(client_name, mech, &cred)) {
353 /* get_ids() prints error msg */
354 maj_stat = GSS_S_BAD_NAME; /* XXX ? */
359 /* Context complete. Pass handle_seq in out_handle to use
360 * for context lookup in the kernel. */
362 out_handle.length = sizeof(handle_seq);
363 memcpy(out_handle.value, &handle_seq, sizeof(handle_seq));
365 /* kernel needs ctx to calculate verifier on null response, so
366 * must give it context before doing null call: */
367 if (serialize_context_for_kernel(ctx, &ctx_token, mech)) {
368 printerr(0, "WARNING: handle_nullreq: "
369 "serialize_context_for_kernel failed\n");
370 maj_stat = GSS_S_FAILURE;
373 do_svc_downcall(&out_handle, &cred, mech, &ctx_token);
375 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
376 &out_handle, &out_tok);
378 if (ctx_token.value != NULL)
379 free(ctx_token.value);
380 printerr(1, "finished handling null request\n");
384 send_response(f, &in_handle, &in_tok, maj_stat, min_stat,
385 &null_token, &null_token);