1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)rexec.c 8.1 (Berkeley) 6/4/93"); 34 35 #include <sys/types.h> 36 #include <sys/uio.h> 37 #include <sys/socket.h> 38 #include <sys/param.h> 39 #include <sys/stat.h> 40 41 #include <netinet/in.h> 42 43 #include <stdio.h> 44 #include <unistd.h> 45 #include <string.h> 46 #include <netdb.h> 47 #include <errno.h> 48 #include <ctype.h> 49 #include <err.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 53 int rexecoptions; 54 55 /* 56 * Options and other state info. 57 */ 58 struct macel { 59 char mac_name[9]; /* macro name */ 60 char *mac_start; /* start of macro in macbuf */ 61 char *mac_end; /* end of macro in macbuf */ 62 }; 63 64 int macnum; /* number of defined macros */ 65 struct macel macros[16]; 66 char macbuf[4096]; 67 68 static FILE *cfile; 69 70 #define DEFAULT 1 71 #define LOGIN 2 72 #define PASSWD 3 73 #define ACCOUNT 4 74 #define MACDEF 5 75 #define ID 10 76 #define MACH 11 77 78 static char tokval[100]; 79 80 static struct toktab { 81 char *tokstr; 82 int tval; 83 } toktab[]= { 84 { "default", DEFAULT }, 85 { "login", LOGIN }, 86 { "password", PASSWD }, 87 { "passwd", PASSWD }, 88 { "account", ACCOUNT }, 89 { "machine", MACH }, 90 { "macdef", MACDEF }, 91 { NULL, 0 } 92 }; 93 94 static int 95 token() 96 { 97 char *cp; 98 int c; 99 struct toktab *t; 100 101 if (feof(cfile) || ferror(cfile)) 102 return (0); 103 while ((c = getc(cfile)) != EOF && 104 (c == '\n' || c == '\t' || c == ' ' || c == ',')) 105 continue; 106 if (c == EOF) 107 return (0); 108 cp = tokval; 109 if (c == '"') { 110 while ((c = getc(cfile)) != EOF && c != '"') { 111 if (c == '\\') 112 c = getc(cfile); 113 *cp++ = c; 114 } 115 } else { 116 *cp++ = c; 117 while ((c = getc(cfile)) != EOF 118 && c != '\n' && c != '\t' && c != ' ' && c != ',') { 119 if (c == '\\') 120 c = getc(cfile); 121 *cp++ = c; 122 } 123 } 124 *cp = 0; 125 if (tokval[0] == 0) 126 return (0); 127 for (t = toktab; t->tokstr; t++) 128 if (!strcmp(t->tokstr, tokval)) 129 return (t->tval); 130 return (ID); 131 } 132 133 static int 134 ruserpass(char *host, char **aname, char **apass, char **aacct) 135 { 136 char *hdir, buf[BUFSIZ], *tmp; 137 char myname[MAXHOSTNAMELEN], *mydomain; 138 int t, i, c, usedefault = 0; 139 struct stat stb; 140 141 hdir = getenv("HOME"); 142 if (hdir == NULL) 143 hdir = "."; 144 if (strlen(hdir) + 8 > sizeof(buf)) 145 return (0); 146 (void) sprintf(buf, "%s/.netrc", hdir); 147 cfile = fopen(buf, "r"); 148 if (cfile == NULL) { 149 if (errno != ENOENT) 150 warn("%s", buf); 151 return (0); 152 } 153 if (gethostname(myname, sizeof(myname)) < 0) 154 myname[0] = '\0'; 155 if ((mydomain = strchr(myname, '.')) == NULL) 156 mydomain = ""; 157 next: 158 while ((t = token())) switch(t) { 159 160 case DEFAULT: 161 usedefault = 1; 162 /* FALL THROUGH */ 163 164 case MACH: 165 if (!usedefault) { 166 if (token() != ID) 167 continue; 168 /* 169 * Allow match either for user's input host name 170 * or official hostname. Also allow match of 171 * incompletely-specified host in local domain. 172 */ 173 if (strcasecmp(host, tokval) == 0) 174 goto match; 175 if ((tmp = strchr(host, '.')) != NULL && 176 strcasecmp(tmp, mydomain) == 0 && 177 strncasecmp(host, tokval, tmp - host) == 0 && 178 tokval[tmp - host] == '\0') 179 goto match; 180 continue; 181 } 182 match: 183 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) { 184 185 case LOGIN: 186 if (token()) 187 if (*aname == NULL) { 188 *aname = malloc((unsigned) strlen(tokval) + 1); 189 (void) strcpy(*aname, tokval); 190 } else { 191 if (strcmp(*aname, tokval)) 192 goto next; 193 } 194 break; 195 case PASSWD: 196 if ((*aname == NULL || strcmp(*aname, "anonymous")) && 197 fstat(fileno(cfile), &stb) >= 0 && 198 (stb.st_mode & 077) != 0) { 199 warnx("Error: .netrc file is readable by others."); 200 warnx("Remove password or make file unreadable by others."); 201 goto bad; 202 } 203 if (token() && *apass == NULL) { 204 *apass = malloc((unsigned) strlen(tokval) + 1); 205 (void) strcpy(*apass, tokval); 206 } 207 break; 208 case ACCOUNT: 209 if (fstat(fileno(cfile), &stb) >= 0 210 && (stb.st_mode & 077) != 0) { 211 warnx("Error: .netrc file is readable by others."); 212 warnx("Remove account or make file unreadable by others."); 213 goto bad; 214 } 215 if (token() && *aacct == NULL) { 216 *aacct = malloc((unsigned) strlen(tokval) + 1); 217 (void) strcpy(*aacct, tokval); 218 } 219 break; 220 case MACDEF: 221 while ((c=getc(cfile)) != EOF && 222 (c == ' ' || c == '\t')) 223 ; 224 if (c == EOF || c == '\n') { 225 printf("Missing macdef name argument.\n"); 226 goto bad; 227 } 228 if (macnum == 16) { 229 printf("Limit of 16 macros have already been defined\n"); 230 goto bad; 231 } 232 tmp = macros[macnum].mac_name; 233 *tmp++ = c; 234 for (i=0; i < 8 && (c=getc(cfile)) != EOF && 235 !isspace(c); ++i) { 236 *tmp++ = c; 237 } 238 if (c == EOF) { 239 printf("Macro definition missing null line terminator.\n"); 240 goto bad; 241 } 242 *tmp = '\0'; 243 if (c != '\n') { 244 while ((c=getc(cfile)) != EOF && c != '\n'); 245 } 246 if (c == EOF) { 247 printf("Macro definition missing null line terminator.\n"); 248 goto bad; 249 } 250 if (macnum == 0) { 251 macros[macnum].mac_start = macbuf; 252 } 253 else { 254 macros[macnum].mac_start = macros[macnum-1].mac_end + 1; 255 } 256 tmp = macros[macnum].mac_start; 257 while (tmp != macbuf + 4096) { 258 if ((c=getc(cfile)) == EOF) { 259 printf("Macro definition missing null line terminator.\n"); 260 goto bad; 261 } 262 *tmp = c; 263 if (*tmp == '\n') { 264 if (*(tmp-1) == '\0') { 265 macros[macnum++].mac_end = tmp - 1; 266 break; 267 } 268 *tmp = '\0'; 269 } 270 tmp++; 271 } 272 if (tmp == macbuf + 4096) { 273 printf("4K macro buffer exceeded\n"); 274 goto bad; 275 } 276 break; 277 default: 278 warnx("Unknown .netrc keyword %s", tokval); 279 break; 280 } 281 goto done; 282 } 283 done: 284 (void) fclose(cfile); 285 return (0); 286 bad: 287 (void) fclose(cfile); 288 return (-1); 289 } 290 291 int 292 rexec(char **ahost, int rport, char *name, char *pass, char *cmd, int *fd2p) 293 { 294 struct sockaddr_in sin, sin2, from; 295 struct hostent *hp; 296 u_short port; 297 int s, timo = 1, s3; 298 char c, *acct; 299 300 hp = gethostbyname(*ahost); 301 if (hp == NULL) { 302 herror(*ahost); 303 return (-1); 304 } 305 *ahost = hp->h_name; 306 acct = NULL; 307 ruserpass(hp->h_name, &name, &pass, &acct); 308 free(acct); 309 retry: 310 s = socket(AF_INET, SOCK_STREAM, 0); 311 if (s < 0) { 312 perror("rexec: socket"); 313 return (-1); 314 } 315 sin.sin_family = hp->h_addrtype; 316 sin.sin_port = rport; 317 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length); 318 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 319 if (errno == ECONNREFUSED && timo <= 16) { 320 (void) close(s); 321 sleep(timo); 322 timo *= 2; 323 goto retry; 324 } 325 perror(hp->h_name); 326 (void) close(s); 327 return (-1); 328 } 329 port = 0; 330 if (fd2p == 0) 331 (void) write(s, "", 1); 332 else { 333 char num[8]; 334 int s2, sin2len; 335 336 s2 = socket(AF_INET, SOCK_STREAM, 0); 337 if (s2 < 0) { 338 (void) close(s); 339 return (-1); 340 } 341 listen(s2, 1); 342 sin2len = sizeof (sin2); 343 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 || 344 sin2len != sizeof (sin2)) { 345 perror("getsockname"); 346 (void) close(s2); 347 goto bad; 348 } 349 port = ntohs((u_short)sin2.sin_port); 350 (void) sprintf(num, "%hu", port); 351 (void) write(s, num, strlen(num)+1); 352 { int len = sizeof (from); 353 s3 = accept(s2, (struct sockaddr *)&from, &len); 354 close(s2); 355 if (s3 < 0) { 356 perror("accept"); 357 port = 0; 358 goto bad; 359 } 360 } 361 *fd2p = s3; 362 } 363 (void) write(s, name, strlen(name) + 1); 364 /* should public key encypt the password here */ 365 (void) write(s, pass, strlen(pass) + 1); 366 (void) write(s, cmd, strlen(cmd) + 1); 367 if (read(s, &c, 1) != 1) { 368 perror(*ahost); 369 goto bad; 370 } 371 if (c != 0) { 372 while (read(s, &c, 1) == 1) { 373 (void) write(2, &c, 1); 374 if (c == '\n') 375 break; 376 } 377 goto bad; 378 } 379 return (s); 380 bad: 381 if (port) 382 (void) close(*fd2p); 383 (void) close(s); 384 return (-1); 385 } 386