summaryrefslogtreecommitdiffstats
path: root/gss-misc.c
blob: a51b48ac9819ab5d112cc03149a20f9e7ab45317 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/* gss-misc.c
 * This is a miscellaneous helper class for gss-api features.
 *
 * Copyright 2007 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of rsyslog.
 *
 * Rsyslog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <fnmatch.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#ifdef USE_PTHREADS
#include <pthread.h>
#else
#include <fcntl.h>
#endif
#include <gssapi/gssapi.h>
#include "syslogd.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "net.h"
#include "omfwd.h"
#include "template.h"
#include "msg.h"
#include "tcpsyslog.h"
#include "module-template.h"
#include "obj.h"
#include "errmsg.h"
#include "gss-misc.h"

MODULE_TYPE_LIB

/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)

static void display_status_(char *m, OM_uint32 code, int type)
{
	OM_uint32 maj_stat, min_stat, msg_ctx = 0;
	gss_buffer_desc msg;

	do {
		maj_stat = gss_display_status(&min_stat, code, type, GSS_C_NO_OID, &msg_ctx, &msg);
		if (maj_stat != GSS_S_COMPLETE) {
			errmsg.LogError(NO_ERRCODE, "GSS-API error in gss_display_status called from <%s>\n", m);
			break;
		} else {
			char buf[1024];
			snprintf(buf, sizeof(buf), "GSS-API error %s: %s\n", m, (char *) msg.value);
			buf[sizeof(buf)/sizeof(char) - 1] = '\0';
			errmsg.LogError(NO_ERRCODE, "%s", buf);
		}
		if (msg.length != 0)
			gss_release_buffer(&min_stat, &msg);
	} while (msg_ctx);
}


static void display_status(char *m, OM_uint32 maj_stat, OM_uint32 min_stat)
{
	display_status_(m, maj_stat, GSS_C_GSS_CODE);
	display_status_(m, min_stat, GSS_C_MECH_CODE);
}


static void display_ctx_flags(OM_uint32 flags)
{
    if (flags & GSS_C_DELEG_FLAG)
	dbgprintf("GSS_C_DELEG_FLAG\n");
    if (flags & GSS_C_MUTUAL_FLAG)
	dbgprintf("GSS_C_MUTUAL_FLAG\n");
    if (flags & GSS_C_REPLAY_FLAG)
	dbgprintf("GSS_C_REPLAY_FLAG\n");
    if (flags & GSS_C_SEQUENCE_FLAG)
	dbgprintf("GSS_C_SEQUENCE_FLAG\n");
    if (flags & GSS_C_CONF_FLAG)
	dbgprintf("GSS_C_CONF_FLAG\n");
    if (flags & GSS_C_INTEG_FLAG)
	dbgprintf("GSS_C_INTEG_FLAG\n");
}


static int read_all(int fd, char *buf, unsigned int nbyte)
{
    int     ret;
    char   *ptr;
    fd_set  rfds;
    struct timeval tv;

    for (ptr = buf; nbyte; ptr += ret, nbyte -= ret) {
	    FD_ZERO(&rfds);
	    FD_SET(fd, &rfds);
	    tv.tv_sec = 1;
	    tv.tv_usec = 0;

	    if ((ret = select(FD_SETSIZE, &rfds, NULL, NULL, &tv)) <= 0
		|| !FD_ISSET(fd, &rfds))
		    return ret;
	    ret = recv(fd, ptr, nbyte, 0);
	    if (ret < 0) {
		    if (errno == EINTR)
			    continue;
		    return (ret);
	    } else if (ret == 0) {
		    return (ptr - buf);
	    }
    }

    return (ptr - buf);
}


static int write_all(int fd, char *buf, unsigned int nbyte)
{
    int     ret;
    char   *ptr;

    for (ptr = buf; nbyte; ptr += ret, nbyte -= ret) {
	ret = send(fd, ptr, nbyte, 0);
	if (ret < 0) {
	    if (errno == EINTR)
		continue;
	    return (ret);
	} else if (ret == 0) {
	    return (ptr - buf);
	}
    }

    return (ptr - buf);
}


static int recv_token(int s, gss_buffer_t tok)
{
	int ret;
	unsigned char lenbuf[4];
	unsigned int len;

	ret = read_all(s, (char *) lenbuf, 4);
	if (ret < 0) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error reading token length");
		return -1;
	} else if (!ret) {
		return 0;
	} else if (ret != 4) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error reading token length");
		return -1;
	}

	len = ((lenbuf[0] << 24)
	       | (lenbuf[1] << 16)
	       | (lenbuf[2] << 8)
	       | lenbuf[3]);
	tok->length = ntohl(len);

	tok->value = (char *) malloc(tok->length ? tok->length : 1);
	if (tok->length && tok->value == NULL) {
		errmsg.LogError(NO_ERRCODE, "Out of memory allocating token data\n");
		return -1;
	}

	ret = read_all(s, (char *) tok->value, tok->length);
	if (ret < 0) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error reading token data");
		free(tok->value);
		return -1;
	} else if (ret != (int) tok->length) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error reading token data");
		free(tok->value);
		return -1;
	}

	return 1;
}


static int send_token(int s, gss_buffer_t tok)
{
	int     ret;
	unsigned char lenbuf[4];
	unsigned int len;

	if (tok->length > 0xffffffffUL)
		abort();  /* TODO: we need to reconsider this, abort() is not really a solution - degrade, but keep running */
	len = htonl(tok->length);
	lenbuf[0] = (len >> 24) & 0xff;
	lenbuf[1] = (len >> 16) & 0xff;
	lenbuf[2] = (len >> 8) & 0xff;
	lenbuf[3] = len & 0xff;

	ret = write_all(s, (char *) lenbuf, 4);
	if (ret < 0) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error sending token length");
		return -1;
	} else if (ret != 4) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error sending token length");
		return -1;
	}

	ret = write_all(s, tok->value, tok->length);
	if (ret < 0) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error sending token data");
		return -1;
	} else if (ret != (int) tok->length) {
		errmsg.LogError(NO_ERRCODE, "GSS-API error sending token data");
		return -1;
	}

	return 0;
}


/* queryInterface function
 * rgerhards, 2008-02-29
 */
BEGINobjQueryInterface(gssutil)
CODESTARTobjQueryInterface(gssutil)
	if(pIf->ifVersion != gssutilCURR_IF_VERSION) { /* check for current version, increment on each change */
		ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
	}

	/* ok, we have the right interface, so let's fill it
	 * Please note that we may also do some backwards-compatibility
	 * work here (if we can support an older interface version - that,
	 * of course, also affects the "if" above).
	 */
	pIf->recv_token = recv_token;
	pIf->send_token = send_token;
	pIf->display_status = display_status;
	pIf->display_ctx_flags = display_ctx_flags;

finalize_it:
ENDobjQueryInterface(gssutil)


/* Initialize our class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-02-29
 */
BEGINAbstractObjClassInit(gssutil, 1, OBJ_IS_LOADABLE_MODULE) /* class, version - CHANGE class also in END MACRO! */
	/* request objects we use */
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
ENDObjClassInit(gssutil)


/* --------------- here now comes the plumbing that makes as a library module --------------- */


BEGINmodExit
CODESTARTmodExit
ENDmodExit


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_LIB_QUERIES
ENDqueryEtryPt


BEGINmodInit()
CODESTARTmodInit
	*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */

	/* Initialize all classes that are in our module - this includes ourselfs */
	CHKiRet(gssutilClassInit()); /* must be done after tcps_sess, as we use it */
ENDmodInit