1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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 * $FreeBSD: src/lib/libcompat/4.3/rexec.c,v 1.5.8.3 2000/11/22 13:36:00 ben Exp $ 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 #include <sys/types.h> 41 #include <sys/uio.h> 42 #include <sys/socket.h> 43 #include <sys/param.h> 44 #include <sys/stat.h> 45 46 #include <netinet/in.h> 47 48 #include <stdio.h> 49 #include <unistd.h> 50 #include <string.h> 51 #include <netdb.h> 52 #include <errno.h> 53 #include <ctype.h> 54 #include <err.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 58 int rexecoptions; 59 char *getpass(), *getlogin(); 60 61 /* 62 * Options and other state info. 63 */ 64 struct macel { 65 char mac_name[9]; /* macro name */ 66 char *mac_start; /* start of macro in macbuf */ 67 char *mac_end; /* end of macro in macbuf */ 68 }; 69 70 int macnum; /* number of defined macros */ 71 struct macel macros[16]; 72 char macbuf[4096]; 73 74 static FILE *cfile; 75 76 #define DEFAULT 1 77 #define LOGIN 2 78 #define PASSWD 3 79 #define ACCOUNT 4 80 #define MACDEF 5 81 #define ID 10 82 #define MACH 11 83 84 static char tokval[100]; 85 86 static struct toktab { 87 char *tokstr; 88 int tval; 89 } toktab[]= { 90 { "default", DEFAULT }, 91 { "login", LOGIN }, 92 { "password", PASSWD }, 93 { "passwd", PASSWD }, 94 { "account", ACCOUNT }, 95 { "machine", MACH }, 96 { "macdef", MACDEF }, 97 { NULL, 0 } 98 }; 99 100 static int 101 token() 102 { 103 char *cp; 104 int c; 105 struct toktab *t; 106 107 if (feof(cfile) || ferror(cfile)) 108 return (0); 109 while ((c = getc(cfile)) != EOF && 110 (c == '\n' || c == '\t' || c == ' ' || c == ',')) 111 continue; 112 if (c == EOF) 113 return (0); 114 cp = tokval; 115 if (c == '"') { 116 while ((c = getc(cfile)) != EOF && c != '"') { 117 if (c == '\\') 118 c = getc(cfile); 119 *cp++ = c; 120 } 121 } else { 122 *cp++ = c; 123 while ((c = getc(cfile)) != EOF 124 && c != '\n' && c != '\t' && c != ' ' && c != ',') { 125 if (c == '\\') 126 c = getc(cfile); 127 *cp++ = c; 128 } 129 } 130 *cp = 0; 131 if (tokval[0] == 0) 132 return (0); 133 for (t = toktab; t->tokstr; t++) 134 if (!strcmp(t->tokstr, tokval)) 135 return (t->tval); 136 return (ID); 137 } 138 139 static int 140 ruserpass(host, aname, apass, aacct) 141 char *host, **aname, **apass, **aacct; 142 { 143 char *hdir, buf[BUFSIZ], *tmp; 144 char myname[MAXHOSTNAMELEN], *mydomain; 145 int t, i, c, usedefault = 0; 146 struct stat stb; 147 148 hdir = getenv("HOME"); 149 if (hdir == NULL) 150 hdir = "."; 151 if (strlen(hdir) + 8 > sizeof(buf)) 152 return (0); 153 (void) sprintf(buf, "%s/.netrc", hdir); 154 cfile = fopen(buf, "r"); 155 if (cfile == NULL) { 156 if (errno != ENOENT) 157 warn("%s", buf); 158 return (0); 159 } 160 if (gethostname(myname, sizeof(myname)) < 0) 161 myname[0] = '\0'; 162 if ((mydomain = strchr(myname, '.')) == NULL) 163 mydomain = ""; 164 next: 165 while ((t = token())) switch(t) { 166 167 case DEFAULT: 168 usedefault = 1; 169 /* FALL THROUGH */ 170 171 case MACH: 172 if (!usedefault) { 173 if (token() != ID) 174 continue; 175 /* 176 * Allow match either for user's input host name 177 * or official hostname. Also allow match of 178 * incompletely-specified host in local domain. 179 */ 180 if (strcasecmp(host, tokval) == 0) 181 goto match; 182 if ((tmp = strchr(host, '.')) != NULL && 183 strcasecmp(tmp, mydomain) == 0 && 184 strncasecmp(host, tokval, tmp - host) == 0 && 185 tokval[tmp - host] == '\0') 186 goto match; 187 continue; 188 } 189 match: 190 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) { 191 192 case LOGIN: 193 if (token()) 194 if (*aname == 0) { 195 *aname = malloc((unsigned) strlen(tokval) + 1); 196 (void) strcpy(*aname, tokval); 197 } else { 198 if (strcmp(*aname, tokval)) 199 goto next; 200 } 201 break; 202 case PASSWD: 203 if ((*aname == 0 || strcmp(*aname, "anonymous")) && 204 fstat(fileno(cfile), &stb) >= 0 && 205 (stb.st_mode & 077) != 0) { 206 warnx("Error: .netrc file is readable by others."); 207 warnx("Remove password or make file unreadable by others."); 208 goto bad; 209 } 210 if (token() && *apass == 0) { 211 *apass = malloc((unsigned) strlen(tokval) + 1); 212 (void) strcpy(*apass, tokval); 213 } 214 break; 215 case ACCOUNT: 216 if (fstat(fileno(cfile), &stb) >= 0 217 && (stb.st_mode & 077) != 0) { 218 warnx("Error: .netrc file is readable by others."); 219 warnx("Remove account or make file unreadable by others."); 220 goto bad; 221 } 222 if (token() && *aacct == 0) { 223 *aacct = malloc((unsigned) strlen(tokval) + 1); 224 (void) strcpy(*aacct, tokval); 225 } 226 break; 227 case MACDEF: 228 while ((c=getc(cfile)) != EOF && 229 (c == ' ' || c == '\t')) 230 ; 231 if (c == EOF || c == '\n') { 232 printf("Missing macdef name argument.\n"); 233 goto bad; 234 } 235 if (macnum == 16) { 236 printf("Limit of 16 macros have already been defined\n"); 237 goto bad; 238 } 239 tmp = macros[macnum].mac_name; 240 *tmp++ = c; 241 for (i=0; i < 8 && (c=getc(cfile)) != EOF && 242 !isspace(c); ++i) { 243 *tmp++ = c; 244 } 245 if (c == EOF) { 246 printf("Macro definition missing null line terminator.\n"); 247 goto bad; 248 } 249 *tmp = '\0'; 250 if (c != '\n') { 251 while ((c=getc(cfile)) != EOF && c != '\n'); 252 } 253 if (c == EOF) { 254 printf("Macro definition missing null line terminator.\n"); 255 goto bad; 256 } 257 if (macnum == 0) { 258 macros[macnum].mac_start = macbuf; 259 } 260 else { 261 macros[macnum].mac_start = macros[macnum-1].mac_end + 1; 262 } 263 tmp = macros[macnum].mac_start; 264 while (tmp != macbuf + 4096) { 265 if ((c=getc(cfile)) == EOF) { 266 printf("Macro definition missing null line terminator.\n"); 267 goto bad; 268 } 269 *tmp = c; 270 if (*tmp == '\n') { 271 if (*(tmp-1) == '\0') { 272 macros[macnum++].mac_end = tmp - 1; 273 break; 274 } 275 *tmp = '\0'; 276 } 277 tmp++; 278 } 279 if (tmp == macbuf + 4096) { 280 printf("4K macro buffer exceeded\n"); 281 goto bad; 282 } 283 break; 284 default: 285 warnx("Unknown .netrc keyword %s", tokval); 286 break; 287 } 288 goto done; 289 } 290 done: 291 (void) fclose(cfile); 292 return (0); 293 bad: 294 (void) fclose(cfile); 295 return (-1); 296 } 297 298 int 299 rexec(ahost, rport, name, pass, cmd, fd2p) 300 char **ahost; 301 int rport; 302 char *name, *pass, *cmd; 303 int *fd2p; 304 { 305 struct sockaddr_in sin, sin2, from; 306 struct hostent *hp; 307 u_short port; 308 int s, timo = 1, s3; 309 char c; 310 311 hp = gethostbyname(*ahost); 312 if (hp == 0) { 313 herror(*ahost); 314 return (-1); 315 } 316 *ahost = hp->h_name; 317 ruserpass(hp->h_name, &name, &pass); 318 retry: 319 s = socket(AF_INET, SOCK_STREAM, 0); 320 if (s < 0) { 321 perror("rexec: socket"); 322 return (-1); 323 } 324 sin.sin_family = hp->h_addrtype; 325 sin.sin_port = rport; 326 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length); 327 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 328 if (errno == ECONNREFUSED && timo <= 16) { 329 (void) close(s); 330 sleep(timo); 331 timo *= 2; 332 goto retry; 333 } 334 perror(hp->h_name); 335 return (-1); 336 } 337 if (fd2p == 0) { 338 (void) write(s, "", 1); 339 port = 0; 340 } else { 341 char num[8]; 342 int s2, sin2len; 343 344 s2 = socket(AF_INET, SOCK_STREAM, 0); 345 if (s2 < 0) { 346 (void) close(s); 347 return (-1); 348 } 349 listen(s2, 1); 350 sin2len = sizeof (sin2); 351 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 || 352 sin2len != sizeof (sin2)) { 353 perror("getsockname"); 354 (void) close(s2); 355 goto bad; 356 } 357 port = ntohs((u_short)sin2.sin_port); 358 (void) sprintf(num, "%u", port); 359 (void) write(s, num, strlen(num)+1); 360 { int len = sizeof (from); 361 s3 = accept(s2, (struct sockaddr *)&from, &len); 362 close(s2); 363 if (s3 < 0) { 364 perror("accept"); 365 port = 0; 366 goto bad; 367 } 368 } 369 *fd2p = s3; 370 } 371 (void) write(s, name, strlen(name) + 1); 372 /* should public key encypt the password here */ 373 (void) write(s, pass, strlen(pass) + 1); 374 (void) write(s, cmd, strlen(cmd) + 1); 375 if (read(s, &c, 1) != 1) { 376 perror(*ahost); 377 goto bad; 378 } 379 if (c != 0) { 380 while (read(s, &c, 1) == 1) { 381 (void) write(2, &c, 1); 382 if (c == '\n') 383 break; 384 } 385 goto bad; 386 } 387 return (s); 388 bad: 389 if (port) 390 (void) close(*fd2p); 391 (void) close(s); 392 return (-1); 393 } 394