| 1 |
/* |
| 2 |
* tcpdchk - examine all tcpd access control rules and inetd.conf entries |
| 3 |
* |
| 4 |
* Usage: tcpdchk [-a] [-d] [-i inet_conf] [-v] |
| 5 |
* |
| 6 |
* -a: complain about implicit "allow" at end of rule. |
| 7 |
* |
| 8 |
* -d: rules in current directory. |
| 9 |
* |
| 10 |
* -i: location of inetd.conf file. |
| 11 |
* |
| 12 |
* -v: show all rules. |
| 13 |
* |
| 14 |
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. |
| 15 |
* |
| 16 |
* $FreeBSD: stable/10/contrib/tcp_wrappers/tcpdchk.c 63158 2000-07-14 17:15:34Z ume $ |
| 17 |
*/ |
| 18 |
|
| 19 |
#ifndef lint |
| 20 |
static char sccsid[] = "@(#) tcpdchk.c 1.8 97/02/12 02:13:25"; |
| 21 |
#endif |
| 22 |
|
| 23 |
/* System libraries. */ |
| 24 |
|
| 25 |
#include <sys/types.h> |
| 26 |
#include <sys/stat.h> |
| 27 |
#ifdef INET6 |
| 28 |
#include <sys/socket.h> |
| 29 |
#endif |
| 30 |
#include <netinet/in.h> |
| 31 |
#include <arpa/inet.h> |
| 32 |
#include <stdio.h> |
| 33 |
#include <syslog.h> |
| 34 |
#include <setjmp.h> |
| 35 |
#include <errno.h> |
| 36 |
#include <netdb.h> |
| 37 |
#include <string.h> |
| 38 |
|
| 39 |
extern int errno; |
| 40 |
extern void exit(); |
| 41 |
extern int optind; |
| 42 |
extern char *optarg; |
| 43 |
|
| 44 |
#ifndef INADDR_NONE |
| 45 |
#define INADDR_NONE (-1) /* XXX should be 0xffffffff */ |
| 46 |
#endif |
| 47 |
|
| 48 |
#ifndef S_ISDIR |
| 49 |
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) |
| 50 |
#endif |
| 51 |
|
| 52 |
/* Application-specific. */ |
| 53 |
|
| 54 |
#include "tcpd.h" |
| 55 |
#include "inetcf.h" |
| 56 |
#include "scaffold.h" |
| 57 |
|
| 58 |
/* |
| 59 |
* Stolen from hosts_access.c... |
| 60 |
*/ |
| 61 |
static char sep[] = ", \t\n"; |
| 62 |
|
| 63 |
#define BUFLEN 2048 |
| 64 |
|
| 65 |
int resident = 0; |
| 66 |
int hosts_access_verbose = 0; |
| 67 |
char *hosts_allow_table = HOSTS_ALLOW; |
| 68 |
char *hosts_deny_table = HOSTS_DENY; |
| 69 |
extern jmp_buf tcpd_buf; |
| 70 |
|
| 71 |
/* |
| 72 |
* Local stuff. |
| 73 |
*/ |
| 74 |
static void usage(); |
| 75 |
static void parse_table(); |
| 76 |
static void print_list(); |
| 77 |
static void check_daemon_list(); |
| 78 |
static void check_client_list(); |
| 79 |
static void check_daemon(); |
| 80 |
static void check_user(); |
| 81 |
static int check_host(); |
| 82 |
static int reserved_name(); |
| 83 |
|
| 84 |
#define PERMIT 1 |
| 85 |
#define DENY 0 |
| 86 |
|
| 87 |
#define YES 1 |
| 88 |
#define NO 0 |
| 89 |
|
| 90 |
static int defl_verdict; |
| 91 |
static char *myname; |
| 92 |
static int allow_check; |
| 93 |
static char *inetcf; |
| 94 |
|
| 95 |
int main(argc, argv) |
| 96 |
int argc; |
| 97 |
char **argv; |
| 98 |
{ |
| 99 |
struct request_info request; |
| 100 |
struct stat st; |
| 101 |
int c; |
| 102 |
|
| 103 |
myname = argv[0]; |
| 104 |
|
| 105 |
/* |
| 106 |
* Parse the JCL. |
| 107 |
*/ |
| 108 |
while ((c = getopt(argc, argv, "adi:v")) != EOF) { |
| 109 |
switch (c) { |
| 110 |
case 'a': |
| 111 |
allow_check = 1; |
| 112 |
break; |
| 113 |
case 'd': |
| 114 |
hosts_allow_table = "hosts.allow"; |
| 115 |
hosts_deny_table = "hosts.deny"; |
| 116 |
break; |
| 117 |
case 'i': |
| 118 |
inetcf = optarg; |
| 119 |
break; |
| 120 |
case 'v': |
| 121 |
hosts_access_verbose++; |
| 122 |
break; |
| 123 |
default: |
| 124 |
usage(); |
| 125 |
/* NOTREACHED */ |
| 126 |
} |
| 127 |
} |
| 128 |
if (argc != optind) |
| 129 |
usage(); |
| 130 |
|
| 131 |
/* |
| 132 |
* When confusion really strikes... |
| 133 |
*/ |
| 134 |
if (check_path(REAL_DAEMON_DIR, &st) < 0) { |
| 135 |
tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR); |
| 136 |
} else if (!S_ISDIR(st.st_mode)) { |
| 137 |
tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR); |
| 138 |
} |
| 139 |
|
| 140 |
/* |
| 141 |
* Process the inet configuration file (or its moral equivalent). This |
| 142 |
* information is used later to find references in hosts.allow/deny to |
| 143 |
* unwrapped services, and other possible problems. |
| 144 |
*/ |
| 145 |
inetcf = inet_cfg(inetcf); |
| 146 |
if (hosts_access_verbose) |
| 147 |
printf("Using network configuration file: %s\n", inetcf); |
| 148 |
|
| 149 |
/* |
| 150 |
* These are not run from inetd but may have built-in access control. |
| 151 |
*/ |
| 152 |
inet_set("portmap", WR_NOT); |
| 153 |
inet_set("rpcbind", WR_NOT); |
| 154 |
|
| 155 |
/* |
| 156 |
* Check accessibility of access control files. |
| 157 |
*/ |
| 158 |
(void) check_path(hosts_allow_table, &st); |
| 159 |
(void) check_path(hosts_deny_table, &st); |
| 160 |
|
| 161 |
/* |
| 162 |
* Fake up an arbitrary service request. |
| 163 |
*/ |
| 164 |
request_init(&request, |
| 165 |
RQ_DAEMON, "daemon_name", |
| 166 |
RQ_SERVER_NAME, "server_hostname", |
| 167 |
RQ_SERVER_ADDR, "server_addr", |
| 168 |
RQ_USER, "user_name", |
| 169 |
RQ_CLIENT_NAME, "client_hostname", |
| 170 |
RQ_CLIENT_ADDR, "client_addr", |
| 171 |
RQ_FILE, 1, |
| 172 |
0); |
| 173 |
|
| 174 |
/* |
| 175 |
* Examine all access-control rules. |
| 176 |
*/ |
| 177 |
defl_verdict = PERMIT; |
| 178 |
parse_table(hosts_allow_table, &request); |
| 179 |
defl_verdict = DENY; |
| 180 |
parse_table(hosts_deny_table, &request); |
| 181 |
return (0); |
| 182 |
} |
| 183 |
|
| 184 |
/* usage - explain */ |
| 185 |
|
| 186 |
static void usage() |
| 187 |
{ |
| 188 |
fprintf(stderr, "usage: %s [-a] [-d] [-i inet_conf] [-v]\n", myname); |
| 189 |
fprintf(stderr, " -a: report rules with implicit \"ALLOW\" at end\n"); |
| 190 |
fprintf(stderr, " -d: use allow/deny files in current directory\n"); |
| 191 |
fprintf(stderr, " -i: location of inetd.conf file\n"); |
| 192 |
fprintf(stderr, " -v: list all rules\n"); |
| 193 |
exit(1); |
| 194 |
} |
| 195 |
|
| 196 |
/* parse_table - like table_match(), but examines _all_ entries */ |
| 197 |
|
| 198 |
static void parse_table(table, request) |
| 199 |
char *table; |
| 200 |
struct request_info *request; |
| 201 |
{ |
| 202 |
FILE *fp; |
| 203 |
int real_verdict; |
| 204 |
char sv_list[BUFLEN]; /* becomes list of daemons */ |
| 205 |
char *cl_list; /* becomes list of requests */ |
| 206 |
char *sh_cmd; /* becomes optional shell command */ |
| 207 |
char buf[BUFSIZ]; |
| 208 |
int verdict; |
| 209 |
struct tcpd_context saved_context; |
| 210 |
|
| 211 |
saved_context = tcpd_context; /* stupid compilers */ |
| 212 |
|
| 213 |
if (fp = fopen(table, "r")) { |
| 214 |
tcpd_context.file = table; |
| 215 |
tcpd_context.line = 0; |
| 216 |
while (xgets(sv_list, sizeof(sv_list), fp)) { |
| 217 |
if (sv_list[strlen(sv_list) - 1] != '\n') { |
| 218 |
tcpd_warn("missing newline or line too long"); |
| 219 |
continue; |
| 220 |
} |
| 221 |
if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0) |
| 222 |
continue; |
| 223 |
if ((cl_list = split_at(sv_list, ':')) == 0) { |
| 224 |
tcpd_warn("missing \":\" separator"); |
| 225 |
continue; |
| 226 |
} |
| 227 |
sh_cmd = split_at(cl_list, ':'); |
| 228 |
|
| 229 |
if (hosts_access_verbose) |
| 230 |
printf("\n>>> Rule %s line %d:\n", |
| 231 |
tcpd_context.file, tcpd_context.line); |
| 232 |
|
| 233 |
if (hosts_access_verbose) |
| 234 |
print_list("daemons: ", sv_list); |
| 235 |
check_daemon_list(sv_list); |
| 236 |
|
| 237 |
if (hosts_access_verbose) |
| 238 |
print_list("clients: ", cl_list); |
| 239 |
check_client_list(cl_list); |
| 240 |
|
| 241 |
#ifdef PROCESS_OPTIONS |
| 242 |
real_verdict = defl_verdict; |
| 243 |
if (sh_cmd) { |
| 244 |
verdict = setjmp(tcpd_buf); |
| 245 |
if (verdict != 0) { |
| 246 |
real_verdict = (verdict == AC_PERMIT); |
| 247 |
} else { |
| 248 |
dry_run = 1; |
| 249 |
process_options(sh_cmd, request); |
| 250 |
if (dry_run == 1 && real_verdict && allow_check) |
| 251 |
tcpd_warn("implicit \"allow\" at end of rule"); |
| 252 |
} |
| 253 |
} else if (defl_verdict && allow_check) { |
| 254 |
tcpd_warn("implicit \"allow\" at end of rule"); |
| 255 |
} |
| 256 |
if (hosts_access_verbose) |
| 257 |
printf("access: %s\n", real_verdict ? "granted" : "denied"); |
| 258 |
#else |
| 259 |
if (sh_cmd) |
| 260 |
shell_cmd(percent_x(buf, sizeof(buf), sh_cmd, request)); |
| 261 |
if (hosts_access_verbose) |
| 262 |
printf("access: %s\n", defl_verdict ? "granted" : "denied"); |
| 263 |
#endif |
| 264 |
} |
| 265 |
(void) fclose(fp); |
| 266 |
} else if (errno != ENOENT) { |
| 267 |
tcpd_warn("cannot open %s: %m", table); |
| 268 |
} |
| 269 |
tcpd_context = saved_context; |
| 270 |
} |
| 271 |
|
| 272 |
/* print_list - pretty-print a list */ |
| 273 |
|
| 274 |
static void print_list(title, list) |
| 275 |
char *title; |
| 276 |
char *list; |
| 277 |
{ |
| 278 |
char buf[BUFLEN]; |
| 279 |
char *cp; |
| 280 |
char *next; |
| 281 |
|
| 282 |
fputs(title, stdout); |
| 283 |
strcpy(buf, list); |
| 284 |
|
| 285 |
for (cp = strtok(buf, sep); cp != 0; cp = next) { |
| 286 |
fputs(cp, stdout); |
| 287 |
next = strtok((char *) 0, sep); |
| 288 |
if (next != 0) |
| 289 |
fputs(" ", stdout); |
| 290 |
} |
| 291 |
fputs("\n", stdout); |
| 292 |
} |
| 293 |
|
| 294 |
/* check_daemon_list - criticize daemon list */ |
| 295 |
|
| 296 |
static void check_daemon_list(list) |
| 297 |
char *list; |
| 298 |
{ |
| 299 |
char buf[BUFLEN]; |
| 300 |
char *cp; |
| 301 |
char *host; |
| 302 |
int daemons = 0; |
| 303 |
|
| 304 |
strcpy(buf, list); |
| 305 |
|
| 306 |
for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) { |
| 307 |
if (STR_EQ(cp, "EXCEPT")) { |
| 308 |
daemons = 0; |
| 309 |
} else { |
| 310 |
daemons++; |
| 311 |
if ((host = split_at(cp + 1, '@')) != 0 && check_host(host) > 1) { |
| 312 |
tcpd_warn("host %s has more than one address", host); |
| 313 |
tcpd_warn("(consider using an address instead)"); |
| 314 |
} |
| 315 |
check_daemon(cp); |
| 316 |
} |
| 317 |
} |
| 318 |
if (daemons == 0) |
| 319 |
tcpd_warn("daemon list is empty or ends in EXCEPT"); |
| 320 |
} |
| 321 |
|
| 322 |
/* check_client_list - criticize client list */ |
| 323 |
|
| 324 |
static void check_client_list(list) |
| 325 |
char *list; |
| 326 |
{ |
| 327 |
char buf[BUFLEN]; |
| 328 |
char *cp; |
| 329 |
char *host; |
| 330 |
int clients = 0; |
| 331 |
|
| 332 |
strcpy(buf, list); |
| 333 |
|
| 334 |
for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) { |
| 335 |
if (STR_EQ(cp, "EXCEPT")) { |
| 336 |
clients = 0; |
| 337 |
} else { |
| 338 |
clients++; |
| 339 |
if (host = split_at(cp + 1, '@')) { /* user@host */ |
| 340 |
check_user(cp); |
| 341 |
check_host(host); |
| 342 |
} else { |
| 343 |
check_host(cp); |
| 344 |
} |
| 345 |
} |
| 346 |
} |
| 347 |
if (clients == 0) |
| 348 |
tcpd_warn("client list is empty or ends in EXCEPT"); |
| 349 |
} |
| 350 |
|
| 351 |
/* check_daemon - criticize daemon pattern */ |
| 352 |
|
| 353 |
static void check_daemon(pat) |
| 354 |
char *pat; |
| 355 |
{ |
| 356 |
if (pat[0] == '@') { |
| 357 |
tcpd_warn("%s: daemon name begins with \"@\"", pat); |
| 358 |
} else if (pat[0] == '/') { |
| 359 |
tcpd_warn("%s: daemon name begins with \"/\"", pat); |
| 360 |
} else if (pat[0] == '.') { |
| 361 |
tcpd_warn("%s: daemon name begins with dot", pat); |
| 362 |
} else if (pat[strlen(pat) - 1] == '.') { |
| 363 |
tcpd_warn("%s: daemon name ends in dot", pat); |
| 364 |
} else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)) { |
| 365 |
/* void */ ; |
| 366 |
} else if (STR_EQ(pat, "FAIL")) { /* obsolete */ |
| 367 |
tcpd_warn("FAIL is no longer recognized"); |
| 368 |
tcpd_warn("(use EXCEPT or DENY instead)"); |
| 369 |
} else if (reserved_name(pat)) { |
| 370 |
tcpd_warn("%s: daemon name may be reserved word", pat); |
| 371 |
} else { |
| 372 |
switch (inet_get(pat)) { |
| 373 |
case WR_UNKNOWN: |
| 374 |
tcpd_warn("%s: no such process name in %s", pat, inetcf); |
| 375 |
inet_set(pat, WR_YES); /* shut up next time */ |
| 376 |
break; |
| 377 |
case WR_NOT: |
| 378 |
tcpd_warn("%s: service possibly not wrapped", pat); |
| 379 |
inet_set(pat, WR_YES); |
| 380 |
break; |
| 381 |
} |
| 382 |
} |
| 383 |
} |
| 384 |
|
| 385 |
/* check_user - criticize user pattern */ |
| 386 |
|
| 387 |
static void check_user(pat) |
| 388 |
char *pat; |
| 389 |
{ |
| 390 |
if (pat[0] == '@') { /* @netgroup */ |
| 391 |
tcpd_warn("%s: user name begins with \"@\"", pat); |
| 392 |
} else if (pat[0] == '/') { |
| 393 |
tcpd_warn("%s: user name begins with \"/\"", pat); |
| 394 |
} else if (pat[0] == '.') { |
| 395 |
tcpd_warn("%s: user name begins with dot", pat); |
| 396 |
} else if (pat[strlen(pat) - 1] == '.') { |
| 397 |
tcpd_warn("%s: user name ends in dot", pat); |
| 398 |
} else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown) |
| 399 |
|| STR_EQ(pat, "KNOWN")) { |
| 400 |
/* void */ ; |
| 401 |
} else if (STR_EQ(pat, "FAIL")) { /* obsolete */ |
| 402 |
tcpd_warn("FAIL is no longer recognized"); |
| 403 |
tcpd_warn("(use EXCEPT or DENY instead)"); |
| 404 |
} else if (reserved_name(pat)) { |
| 405 |
tcpd_warn("%s: user name may be reserved word", pat); |
| 406 |
} |
| 407 |
} |
| 408 |
|
| 409 |
#ifdef INET6 |
| 410 |
static int is_inet6_addr(pat) |
| 411 |
char *pat; |
| 412 |
{ |
| 413 |
struct addrinfo hints, *res; |
| 414 |
int len, ret; |
| 415 |
char ch; |
| 416 |
|
| 417 |
if (*pat != '[') |
| 418 |
return (0); |
| 419 |
len = strlen(pat); |
| 420 |
if ((ch = pat[len - 1]) != ']') |
| 421 |
return (0); |
| 422 |
pat[len - 1] = '\0'; |
| 423 |
memset(&hints, 0, sizeof(hints)); |
| 424 |
hints.ai_family = AF_INET6; |
| 425 |
hints.ai_socktype = SOCK_STREAM; |
| 426 |
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
| 427 |
if ((ret = getaddrinfo(pat + 1, NULL, &hints, &res)) == 0) |
| 428 |
freeaddrinfo(res); |
| 429 |
pat[len - 1] = ch; |
| 430 |
return (ret == 0); |
| 431 |
} |
| 432 |
#endif |
| 433 |
|
| 434 |
/* check_host - criticize host pattern */ |
| 435 |
|
| 436 |
static int check_host(pat) |
| 437 |
char *pat; |
| 438 |
{ |
| 439 |
char buf[BUFSIZ]; |
| 440 |
char *mask; |
| 441 |
int addr_count = 1; |
| 442 |
FILE *fp; |
| 443 |
struct tcpd_context saved_context; |
| 444 |
char *cp; |
| 445 |
char *wsp = " \t\r\n"; |
| 446 |
|
| 447 |
if (pat[0] == '@') { /* @netgroup */ |
| 448 |
#ifdef NO_NETGRENT |
| 449 |
/* SCO has no *netgrent() support */ |
| 450 |
#else |
| 451 |
#ifdef NETGROUP |
| 452 |
char *machinep; |
| 453 |
char *userp; |
| 454 |
char *domainp; |
| 455 |
|
| 456 |
setnetgrent(pat + 1); |
| 457 |
if (getnetgrent(&machinep, &userp, &domainp) == 0) |
| 458 |
tcpd_warn("%s: unknown or empty netgroup", pat + 1); |
| 459 |
endnetgrent(); |
| 460 |
#else |
| 461 |
tcpd_warn("netgroup support disabled"); |
| 462 |
#endif |
| 463 |
#endif |
| 464 |
} else if (pat[0] == '/') { /* /path/name */ |
| 465 |
if ((fp = fopen(pat, "r")) != 0) { |
| 466 |
saved_context = tcpd_context; |
| 467 |
tcpd_context.file = pat; |
| 468 |
tcpd_context.line = 0; |
| 469 |
while (fgets(buf, sizeof(buf), fp)) { |
| 470 |
tcpd_context.line++; |
| 471 |
for (cp = strtok(buf, wsp); cp; cp = strtok((char *) 0, wsp)) |
| 472 |
check_host(cp); |
| 473 |
} |
| 474 |
tcpd_context = saved_context; |
| 475 |
fclose(fp); |
| 476 |
} else if (errno != ENOENT) { |
| 477 |
tcpd_warn("open %s: %m", pat); |
| 478 |
} |
| 479 |
} else if (mask = split_at(pat, '/')) { /* network/netmask */ |
| 480 |
#ifdef INET6 |
| 481 |
int mask_len; |
| 482 |
|
| 483 |
if ((dot_quad_addr(pat) == INADDR_NONE |
| 484 |
|| dot_quad_addr(mask) == INADDR_NONE) |
| 485 |
&& (!is_inet6_addr(pat) |
| 486 |
|| ((mask_len = atoi(mask)) < 0 || mask_len > 128))) |
| 487 |
#else |
| 488 |
if (dot_quad_addr(pat) == INADDR_NONE |
| 489 |
|| dot_quad_addr(mask) == INADDR_NONE) |
| 490 |
#endif |
| 491 |
tcpd_warn("%s/%s: bad net/mask pattern", pat, mask); |
| 492 |
} else if (STR_EQ(pat, "FAIL")) { /* obsolete */ |
| 493 |
tcpd_warn("FAIL is no longer recognized"); |
| 494 |
tcpd_warn("(use EXCEPT or DENY instead)"); |
| 495 |
} else if (reserved_name(pat)) { /* other reserved */ |
| 496 |
/* void */ ; |
| 497 |
#ifdef INET6 |
| 498 |
} else if (is_inet6_addr(pat)) { /* IPv6 address */ |
| 499 |
addr_count = 1; |
| 500 |
#endif |
| 501 |
} else if (NOT_INADDR(pat)) { /* internet name */ |
| 502 |
if (pat[strlen(pat) - 1] == '.') { |
| 503 |
tcpd_warn("%s: domain or host name ends in dot", pat); |
| 504 |
} else if (pat[0] != '.') { |
| 505 |
addr_count = check_dns(pat); |
| 506 |
} |
| 507 |
} else { /* numeric form */ |
| 508 |
if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) { |
| 509 |
/* void */ ; |
| 510 |
} else if (pat[0] == '.') { |
| 511 |
tcpd_warn("%s: network number begins with dot", pat); |
| 512 |
} else if (pat[strlen(pat) - 1] != '.') { |
| 513 |
check_dns(pat); |
| 514 |
} |
| 515 |
} |
| 516 |
return (addr_count); |
| 517 |
} |
| 518 |
|
| 519 |
/* reserved_name - determine if name is reserved */ |
| 520 |
|
| 521 |
static int reserved_name(pat) |
| 522 |
char *pat; |
| 523 |
{ |
| 524 |
return (STR_EQ(pat, unknown) |
| 525 |
|| STR_EQ(pat, "KNOWN") |
| 526 |
|| STR_EQ(pat, paranoid) |
| 527 |
|| STR_EQ(pat, "ALL") |
| 528 |
|| STR_EQ(pat, "LOCAL")); |
| 529 |
} |
