Annotation of src/usr.bin/ssh/gss-genr.c, Revision 1.11
1.11 ! stevesk 1: /* $OpenBSD: gss-genr.c,v 1.10 2006/04/03 07:10:38 djm Exp $ */
1.1 markus 2:
3: /*
4: * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include "includes.h"
28:
29: #ifdef GSSAPI
1.11 ! stevesk 30:
! 31: #include <string.h>
1.1 markus 32:
33: #include "xmalloc.h"
34: #include "bufaux.h"
35: #include "log.h"
1.2 markus 36: #include "ssh2.h"
1.1 markus 37:
38: #include "ssh-gss.h"
39:
1.2 markus 40: extern u_char *session_id2;
41: extern u_int session_id2_len;
1.1 markus 42:
43: /* Check that the OID in a data stream matches that in the context */
44: int
45: ssh_gssapi_check_oid(Gssctxt *ctx, void *data, size_t len)
46: {
47: return (ctx != NULL && ctx->oid != GSS_C_NO_OID &&
48: ctx->oid->length == len &&
49: memcmp(ctx->oid->elements, data, len) == 0);
50: }
51:
52: /* Set the contexts OID from a data stream */
53: void
54: ssh_gssapi_set_oid_data(Gssctxt *ctx, void *data, size_t len)
55: {
56: if (ctx->oid != GSS_C_NO_OID) {
57: xfree(ctx->oid->elements);
58: xfree(ctx->oid);
59: }
60: ctx->oid = xmalloc(sizeof(gss_OID_desc));
61: ctx->oid->length = len;
62: ctx->oid->elements = xmalloc(len);
63: memcpy(ctx->oid->elements, data, len);
64: }
65:
66: /* Set the contexts OID */
67: void
68: ssh_gssapi_set_oid(Gssctxt *ctx, gss_OID oid)
69: {
70: ssh_gssapi_set_oid_data(ctx, oid->elements, oid->length);
71: }
72:
73: /* All this effort to report an error ... */
74: void
75: ssh_gssapi_error(Gssctxt *ctxt)
76: {
1.7 djm 77: char *s;
78:
79: s = ssh_gssapi_last_error(ctxt, NULL, NULL);
80: debug("%s", s);
81: xfree(s);
1.1 markus 82: }
83:
84: char *
1.4 djm 85: ssh_gssapi_last_error(Gssctxt *ctxt, OM_uint32 *major_status,
86: OM_uint32 *minor_status)
1.1 markus 87: {
88: OM_uint32 lmin;
89: gss_buffer_desc msg = GSS_C_EMPTY_BUFFER;
90: OM_uint32 ctx;
91: Buffer b;
92: char *ret;
93:
94: buffer_init(&b);
95:
96: if (major_status != NULL)
97: *major_status = ctxt->major;
98: if (minor_status != NULL)
99: *minor_status = ctxt->minor;
100:
101: ctx = 0;
102: /* The GSSAPI error */
103: do {
104: gss_display_status(&lmin, ctxt->major,
105: GSS_C_GSS_CODE, GSS_C_NULL_OID, &ctx, &msg);
106:
107: buffer_append(&b, msg.value, msg.length);
108: buffer_put_char(&b, '\n');
109:
110: gss_release_buffer(&lmin, &msg);
111: } while (ctx != 0);
112:
113: /* The mechanism specific error */
114: do {
115: gss_display_status(&lmin, ctxt->minor,
116: GSS_C_MECH_CODE, GSS_C_NULL_OID, &ctx, &msg);
117:
118: buffer_append(&b, msg.value, msg.length);
119: buffer_put_char(&b, '\n');
120:
121: gss_release_buffer(&lmin, &msg);
122: } while (ctx != 0);
123:
124: buffer_put_char(&b, '\0');
125: ret = xmalloc(buffer_len(&b));
126: buffer_get(&b, ret, buffer_len(&b));
127: buffer_free(&b);
128: return (ret);
129: }
130:
131: /*
132: * Initialise our GSSAPI context. We use this opaque structure to contain all
133: * of the data which both the client and server need to persist across
134: * {accept,init}_sec_context calls, so that when we do it from the userauth
135: * stuff life is a little easier
136: */
137: void
138: ssh_gssapi_build_ctx(Gssctxt **ctx)
139: {
1.8 djm 140: *ctx = xcalloc(1, sizeof (Gssctxt));
1.1 markus 141: (*ctx)->context = GSS_C_NO_CONTEXT;
142: (*ctx)->name = GSS_C_NO_NAME;
143: (*ctx)->oid = GSS_C_NO_OID;
144: (*ctx)->creds = GSS_C_NO_CREDENTIAL;
145: (*ctx)->client = GSS_C_NO_NAME;
146: (*ctx)->client_creds = GSS_C_NO_CREDENTIAL;
147: }
148:
149: /* Delete our context, providing it has been built correctly */
150: void
151: ssh_gssapi_delete_ctx(Gssctxt **ctx)
152: {
153: OM_uint32 ms;
154:
155: if ((*ctx) == NULL)
156: return;
157: if ((*ctx)->context != GSS_C_NO_CONTEXT)
158: gss_delete_sec_context(&ms, &(*ctx)->context, GSS_C_NO_BUFFER);
159: if ((*ctx)->name != GSS_C_NO_NAME)
160: gss_release_name(&ms, &(*ctx)->name);
161: if ((*ctx)->oid != GSS_C_NO_OID) {
162: xfree((*ctx)->oid->elements);
163: xfree((*ctx)->oid);
164: (*ctx)->oid = GSS_C_NO_OID;
165: }
166: if ((*ctx)->creds != GSS_C_NO_CREDENTIAL)
167: gss_release_cred(&ms, &(*ctx)->creds);
168: if ((*ctx)->client != GSS_C_NO_NAME)
169: gss_release_name(&ms, &(*ctx)->client);
170: if ((*ctx)->client_creds != GSS_C_NO_CREDENTIAL)
171: gss_release_cred(&ms, &(*ctx)->client_creds);
172:
173: xfree(*ctx);
174: *ctx = NULL;
175: }
176:
177: /*
178: * Wrapper to init_sec_context
179: * Requires that the context contains:
180: * oid
181: * server name (from ssh_gssapi_import_name)
182: */
183: OM_uint32
184: ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds, gss_buffer_desc *recv_tok,
185: gss_buffer_desc* send_tok, OM_uint32 *flags)
186: {
187: int deleg_flag = 0;
188:
189: if (deleg_creds) {
190: deleg_flag = GSS_C_DELEG_FLAG;
191: debug("Delegating credentials");
192: }
193:
194: ctx->major = gss_init_sec_context(&ctx->minor,
195: GSS_C_NO_CREDENTIAL, &ctx->context, ctx->name, ctx->oid,
196: GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | deleg_flag,
197: 0, NULL, recv_tok, NULL, send_tok, flags, NULL);
198:
199: if (GSS_ERROR(ctx->major))
200: ssh_gssapi_error(ctx);
201:
202: return (ctx->major);
203: }
204:
205: /* Create a service name for the given host */
206: OM_uint32
207: ssh_gssapi_import_name(Gssctxt *ctx, const char *host)
208: {
209: gss_buffer_desc gssbuf;
1.10 djm 210: char *val;
1.1 markus 211:
1.10 djm 212: xasprintf(&val, "host@%s", host);
213: gssbuf.value = val;
214: gssbuf.length = strlen(gssbuf.value);
1.1 markus 215:
216: if ((ctx->major = gss_import_name(&ctx->minor,
217: &gssbuf, GSS_C_NT_HOSTBASED_SERVICE, &ctx->name)))
218: ssh_gssapi_error(ctx);
219:
220: xfree(gssbuf.value);
221: return (ctx->major);
222: }
223:
224: /* Acquire credentials for a server running on the current host.
225: * Requires that the context structure contains a valid OID
226: */
227:
228: /* Returns a GSSAPI error code */
229: OM_uint32
230: ssh_gssapi_acquire_cred(Gssctxt *ctx)
231: {
232: OM_uint32 status;
233: char lname[MAXHOSTNAMELEN];
234: gss_OID_set oidset;
235:
236: gss_create_empty_oid_set(&status, &oidset);
237: gss_add_oid_set_member(&status, ctx->oid, &oidset);
238:
1.7 djm 239: if (gethostname(lname, MAXHOSTNAMELEN)) {
240: gss_release_oid_set(&status, &oidset);
1.1 markus 241: return (-1);
1.7 djm 242: }
1.1 markus 243:
1.7 djm 244: if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
245: gss_release_oid_set(&status, &oidset);
1.1 markus 246: return (ctx->major);
1.7 djm 247: }
1.1 markus 248:
249: if ((ctx->major = gss_acquire_cred(&ctx->minor,
250: ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL)))
251: ssh_gssapi_error(ctx);
252:
253: gss_release_oid_set(&status, &oidset);
254: return (ctx->major);
1.2 markus 255: }
256:
257: OM_uint32
258: ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_t buffer, gss_buffer_t hash)
259: {
260: if ((ctx->major = gss_get_mic(&ctx->minor, ctx->context,
261: GSS_C_QOP_DEFAULT, buffer, hash)))
262: ssh_gssapi_error(ctx);
1.3 djm 263:
1.2 markus 264: return (ctx->major);
265: }
266:
267: void
1.3 djm 268: ssh_gssapi_buildmic(Buffer *b, const char *user, const char *service,
269: const char *context)
270: {
1.2 markus 271: buffer_init(b);
272: buffer_put_string(b, session_id2, session_id2_len);
273: buffer_put_char(b, SSH2_MSG_USERAUTH_REQUEST);
274: buffer_put_cstring(b, user);
275: buffer_put_cstring(b, service);
276: buffer_put_cstring(b, context);
1.1 markus 277: }
278:
279: OM_uint32
1.6 stevesk 280: ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
281: {
1.1 markus 282: if (*ctx)
283: ssh_gssapi_delete_ctx(ctx);
284: ssh_gssapi_build_ctx(ctx);
285: ssh_gssapi_set_oid(*ctx, oid);
286: return (ssh_gssapi_acquire_cred(*ctx));
287: }
288:
289: #endif /* GSSAPI */
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