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(caddr_t policy, char *delimiter) 74 { 75 struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy; 76 struct sadb_x_ipsecrequest *xisr; 77 size_t off, buflen; 78 char *buf; 79 char isrbuf[1024]; 80 char *newbuf; 81 82 /* sanity check */ 83 if (policy == NULL) 84 return NULL; 85 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 86 __ipsec_errcode = EIPSEC_INVAL_EXTTYPE; 87 return NULL; 88 } 89 90 /* set delimiter */ 91 if (delimiter == NULL) 92 delimiter = " "; 93 94 switch (xpl->sadb_x_policy_dir) { 95 case IPSEC_DIR_ANY: 96 case IPSEC_DIR_INBOUND: 97 case IPSEC_DIR_OUTBOUND: 98 break; 99 default: 100 __ipsec_errcode = EIPSEC_INVAL_DIR; 101 return NULL; 102 } 103 104 switch (xpl->sadb_x_policy_type) { 105 case IPSEC_POLICY_DISCARD: 106 case IPSEC_POLICY_NONE: 107 case IPSEC_POLICY_IPSEC: 108 case IPSEC_POLICY_BYPASS: 109 case IPSEC_POLICY_ENTRUST: 110 break; 111 default: 112 __ipsec_errcode = EIPSEC_INVAL_POLICY; 113 return NULL; 114 } 115 116 buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir]) 117 + 1 /* space */ 118 + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type]) 119 + 1; /* NUL */ 120 121 if ((buf = malloc(buflen)) == NULL) { 122 __ipsec_errcode = EIPSEC_NO_BUFS; 123 return NULL; 124 } 125 snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir], 126 ipsp_policy_strs[xpl->sadb_x_policy_type]); 127 128 if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) { 129 __ipsec_errcode = EIPSEC_NO_ERROR; 130 return buf; 131 } 132 133 /* count length of buffer for use */ 134 off = sizeof(*xpl); 135 while (off < PFKEY_EXTLEN(xpl)) { 136 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off); 137 off += xisr->sadb_x_ipsecrequest_len; 138 } 139 140 /* validity check */ 141 if (off != PFKEY_EXTLEN(xpl)) { 142 __ipsec_errcode = EIPSEC_INVAL_SADBMSG; 143 free(buf); 144 return NULL; 145 } 146 147 off = sizeof(*xpl); 148 while (off < PFKEY_EXTLEN(xpl)) { 149 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off); 150 151 if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr, 152 PFKEY_EXTLEN(xpl) - off) == NULL) { 153 free(buf); 154 return NULL; 155 } 156 157 buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1; 158 newbuf = (char *)realloc(buf, buflen); 159 if (newbuf == NULL) { 160 __ipsec_errcode = EIPSEC_NO_BUFS; 161 free(buf); 162 return NULL; 163 } 164 buf = newbuf; 165 snprintf(buf + strlen(buf), buflen - strlen(buf), 166 "%s%s", delimiter, isrbuf); 167 168 off += xisr->sadb_x_ipsecrequest_len; 169 } 170 171 __ipsec_errcode = EIPSEC_NO_ERROR; 172 return buf; 173 } 174 175 static char * 176 ipsec_dump_ipsecrequest(char *buf, size_t len, struct sadb_x_ipsecrequest *xisr, 177 size_t bound) 178 { 179 const char *proto, *mode, *level; 180 char abuf[NI_MAXHOST * 2 + 2]; 181 182 if (xisr->sadb_x_ipsecrequest_len > bound) { 183 __ipsec_errcode = EIPSEC_INVAL_PROTO; 184 return NULL; 185 } 186 187 switch (xisr->sadb_x_ipsecrequest_proto) { 188 case IPPROTO_ESP: 189 proto = "esp"; 190 break; 191 case IPPROTO_AH: 192 proto = "ah"; 193 break; 194 case IPPROTO_IPCOMP: 195 proto = "ipcomp"; 196 break; 197 case IPPROTO_TCP: 198 proto = "tcp"; 199 break; 200 default: 201 __ipsec_errcode = EIPSEC_INVAL_PROTO; 202 return NULL; 203 } 204 205 switch (xisr->sadb_x_ipsecrequest_mode) { 206 case IPSEC_MODE_ANY: 207 mode = "any"; 208 break; 209 case IPSEC_MODE_TRANSPORT: 210 mode = "transport"; 211 break; 212 case IPSEC_MODE_TUNNEL: 213 mode = "tunnel"; 214 break; 215 default: 216 __ipsec_errcode = EIPSEC_INVAL_MODE; 217 return NULL; 218 } 219 220 abuf[0] = '\0'; 221 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 222 struct sockaddr *sa1, *sa2; 223 caddr_t p; 224 225 p = (caddr_t)(xisr + 1); 226 sa1 = (struct sockaddr *)p; 227 sa2 = (struct sockaddr *)(p + sa1->sa_len); 228 if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len != 229 xisr->sadb_x_ipsecrequest_len) { 230 __ipsec_errcode = EIPSEC_INVAL_ADDRESS; 231 return NULL; 232 } 233 if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) { 234 __ipsec_errcode = EIPSEC_INVAL_ADDRESS; 235 return NULL; 236 } 237 } 238 239 switch (xisr->sadb_x_ipsecrequest_level) { 240 case IPSEC_LEVEL_DEFAULT: 241 level = "default"; 242 break; 243 case IPSEC_LEVEL_USE: 244 level = "use"; 245 break; 246 case IPSEC_LEVEL_REQUIRE: 247 level = "require"; 248 break; 249 case IPSEC_LEVEL_UNIQUE: 250 level = "unique"; 251 break; 252 default: 253 __ipsec_errcode = EIPSEC_INVAL_LEVEL; 254 return NULL; 255 } 256 257 if (xisr->sadb_x_ipsecrequest_reqid == 0) 258 snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level); 259 else { 260 int ch; 261 262 if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX) 263 ch = '#'; 264 else 265 ch = ':'; 266 snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level, 267 ch, xisr->sadb_x_ipsecrequest_reqid); 268 } 269 270 return buf; 271 } 272 273 static int 274 set_addresses(char *buf, size_t len, struct sockaddr *sa1, struct sockaddr *sa2) 275 { 276 char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST]; 277 278 if (set_address(tmp1, sizeof(tmp1), sa1) == NULL || 279 set_address(tmp2, sizeof(tmp2), sa2) == NULL) 280 return -1; 281 if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len) 282 return -1; 283 snprintf(buf, len, "%s-%s", tmp1, tmp2); 284 return 0; 285 } 286 287 static char * 288 set_address(char *buf, size_t len, struct sockaddr *sa) 289 { 290 const int niflags = NI_NUMERICHOST; 291 292 if (len < 1) 293 return NULL; 294 buf[0] = '\0'; 295 if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0) 296 return NULL; 297 return buf; 298 } 299