1 /* $KAME: ipsec_dump_policy.c,v 1.13 2002/06/27 14:35:11 itojun Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/socket.h> 40 41 #include <netipsec/key_var.h> 42 #include <netinet/in.h> 43 #include <netipsec/ipsec.h> 44 45 #include <arpa/inet.h> 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <netdb.h> 51 52 #include "ipsec_strerror.h" 53 54 static const char *ipsp_dir_strs[] = { 55 "any", "in", "out", 56 }; 57 58 static const char *ipsp_policy_strs[] = { 59 "discard", "none", "ipsec", "entrust", "bypass", 60 }; 61 62 static char *ipsec_dump_ipsecrequest(char *, size_t, 63 struct sadb_x_ipsecrequest *, size_t); 64 static int set_addresses(char *, size_t, struct sockaddr *, struct sockaddr *); 65 static char *set_address(char *, size_t, struct sockaddr *); 66 67 /* 68 * policy is sadb_x_policy buffer. 69 * Must call free() later. 70 * When delimiter == NULL, alternatively ' '(space) is applied. 71 */ 72 char * 73 ipsec_dump_policy(policy, delimiter) 74 caddr_t policy; 75 char *delimiter; 76 { 77 struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy; 78 struct sadb_x_ipsecrequest *xisr; 79 size_t off, buflen; 80 char *buf; 81 char isrbuf[1024]; 82 char *newbuf; 83 84 /* sanity check */ 85 if (policy == NULL) 86 return NULL; 87 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 88 __ipsec_errcode = EIPSEC_INVAL_EXTTYPE; 89 return NULL; 90 } 91 92 /* set delimiter */ 93 if (delimiter == NULL) 94 delimiter = " "; 95 96 switch (xpl->sadb_x_policy_dir) { 97 case IPSEC_DIR_ANY: 98 case IPSEC_DIR_INBOUND: 99 case IPSEC_DIR_OUTBOUND: 100 break; 101 default: 102 __ipsec_errcode = EIPSEC_INVAL_DIR; 103 return NULL; 104 } 105 106 switch (xpl->sadb_x_policy_type) { 107 case IPSEC_POLICY_DISCARD: 108 case IPSEC_POLICY_NONE: 109 case IPSEC_POLICY_IPSEC: 110 case IPSEC_POLICY_BYPASS: 111 case IPSEC_POLICY_ENTRUST: 112 break; 113 default: 114 __ipsec_errcode = EIPSEC_INVAL_POLICY; 115 return NULL; 116 } 117 118 buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir]) 119 + 1 /* space */ 120 + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type]) 121 + 1; /* NUL */ 122 123 if ((buf = malloc(buflen)) == NULL) { 124 __ipsec_errcode = EIPSEC_NO_BUFS; 125 return NULL; 126 } 127 snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir], 128 ipsp_policy_strs[xpl->sadb_x_policy_type]); 129 130 if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) { 131 __ipsec_errcode = EIPSEC_NO_ERROR; 132 return buf; 133 } 134 135 /* count length of buffer for use */ 136 off = sizeof(*xpl); 137 while (off < PFKEY_EXTLEN(xpl)) { 138 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off); 139 off += xisr->sadb_x_ipsecrequest_len; 140 } 141 142 /* validity check */ 143 if (off != PFKEY_EXTLEN(xpl)) { 144 __ipsec_errcode = EIPSEC_INVAL_SADBMSG; 145 free(buf); 146 return NULL; 147 } 148 149 off = sizeof(*xpl); 150 while (off < PFKEY_EXTLEN(xpl)) { 151 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off); 152 153 if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr, 154 PFKEY_EXTLEN(xpl) - off) == NULL) { 155 free(buf); 156 return NULL; 157 } 158 159 buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1; 160 newbuf = (char *)realloc(buf, buflen); 161 if (newbuf == NULL) { 162 __ipsec_errcode = EIPSEC_NO_BUFS; 163 free(buf); 164 return NULL; 165 } 166 buf = newbuf; 167 snprintf(buf + strlen(buf), buflen - strlen(buf), 168 "%s%s", delimiter, isrbuf); 169 170 off += xisr->sadb_x_ipsecrequest_len; 171 } 172 173 __ipsec_errcode = EIPSEC_NO_ERROR; 174 return buf; 175 } 176 177 static char * 178 ipsec_dump_ipsecrequest(buf, len, xisr, bound) 179 char *buf; 180 size_t len; 181 struct sadb_x_ipsecrequest *xisr; 182 size_t bound; /* boundary */ 183 { 184 const char *proto, *mode, *level; 185 char abuf[NI_MAXHOST * 2 + 2]; 186 187 if (xisr->sadb_x_ipsecrequest_len > bound) { 188 __ipsec_errcode = EIPSEC_INVAL_PROTO; 189 return NULL; 190 } 191 192 switch (xisr->sadb_x_ipsecrequest_proto) { 193 case IPPROTO_ESP: 194 proto = "esp"; 195 break; 196 case IPPROTO_AH: 197 proto = "ah"; 198 break; 199 case IPPROTO_IPCOMP: 200 proto = "ipcomp"; 201 break; 202 case IPPROTO_TCP: 203 proto = "tcp"; 204 break; 205 default: 206 __ipsec_errcode = EIPSEC_INVAL_PROTO; 207 return NULL; 208 } 209 210 switch (xisr->sadb_x_ipsecrequest_mode) { 211 case IPSEC_MODE_ANY: 212 mode = "any"; 213 break; 214 case IPSEC_MODE_TRANSPORT: 215 mode = "transport"; 216 break; 217 case IPSEC_MODE_TUNNEL: 218 mode = "tunnel"; 219 break; 220 default: 221 __ipsec_errcode = EIPSEC_INVAL_MODE; 222 return NULL; 223 } 224 225 abuf[0] = '\0'; 226 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 227 struct sockaddr *sa1, *sa2; 228 caddr_t p; 229 230 p = (caddr_t)(xisr + 1); 231 sa1 = (struct sockaddr *)p; 232 sa2 = (struct sockaddr *)(p + sa1->sa_len); 233 if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len != 234 xisr->sadb_x_ipsecrequest_len) { 235 __ipsec_errcode = EIPSEC_INVAL_ADDRESS; 236 return NULL; 237 } 238 if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) { 239 __ipsec_errcode = EIPSEC_INVAL_ADDRESS; 240 return NULL; 241 } 242 } 243 244 switch (xisr->sadb_x_ipsecrequest_level) { 245 case IPSEC_LEVEL_DEFAULT: 246 level = "default"; 247 break; 248 case IPSEC_LEVEL_USE: 249 level = "use"; 250 break; 251 case IPSEC_LEVEL_REQUIRE: 252 level = "require"; 253 break; 254 case IPSEC_LEVEL_UNIQUE: 255 level = "unique"; 256 break; 257 default: 258 __ipsec_errcode = EIPSEC_INVAL_LEVEL; 259 return NULL; 260 } 261 262 if (xisr->sadb_x_ipsecrequest_reqid == 0) 263 snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level); 264 else { 265 int ch; 266 267 if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX) 268 ch = '#'; 269 else 270 ch = ':'; 271 snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level, 272 ch, xisr->sadb_x_ipsecrequest_reqid); 273 } 274 275 return buf; 276 } 277 278 static int 279 set_addresses(buf, len, sa1, sa2) 280 char *buf; 281 size_t len; 282 struct sockaddr *sa1; 283 struct sockaddr *sa2; 284 { 285 char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST]; 286 287 if (set_address(tmp1, sizeof(tmp1), sa1) == NULL || 288 set_address(tmp2, sizeof(tmp2), sa2) == NULL) 289 return -1; 290 if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len) 291 return -1; 292 snprintf(buf, len, "%s-%s", tmp1, tmp2); 293 return 0; 294 } 295 296 static char * 297 set_address(buf, len, sa) 298 char *buf; 299 size_t len; 300 struct sockaddr *sa; 301 { 302 const int niflags = NI_NUMERICHOST; 303 304 if (len < 1) 305 return NULL; 306 buf[0] = '\0'; 307 if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0) 308 return NULL; 309 return buf; 310 } 311