lib/libcompat/4.3/rexec.c

   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  * $DragonFly: src/lib/libcompat/4.3/rexec.c,v 1.3 2006/07/30 07:50:28 swildner Exp $
  35  *
  36  * @(#)rexec.c  8.1 (Berkeley) 6/4/93
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/uio.h>
  41 #include <sys/socket.h>
  42 #include <sys/param.h>
  43 #include <sys/stat.h>
  44
  45 #include <netinet/in.h>
  46
  47 #include <stdio.h>
  48 #include <unistd.h>
  49 #include <string.h>
  50 #include <netdb.h>
  51 #include <errno.h>
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <stdlib.h>
  55 #include <unistd.h>
  56
  57 int     rexecoptions;
  58 char    *getpass(), *getlogin();
  59
  60 /*
  61  * Options and other state info.
  62  */
  63 struct macel {
  64         char mac_name[9];       /* macro name */
  65         char *mac_start;        /* start of macro in macbuf */
  66         char *mac_end;          /* end of macro in macbuf */
  67 };
  68
  69 int macnum;                     /* number of defined macros */
  70 struct macel macros[16];
  71 char macbuf[4096];
  72
  73 static  FILE *cfile;
  74
  75 #define DEFAULT 1
  76 #define LOGIN   2
  77 #define PASSWD  3
  78 #define ACCOUNT 4
  79 #define MACDEF  5
  80 #define ID      10
  81 #define MACH    11
  82
  83 static char tokval[100];
  84
  85 static struct toktab {
  86         char *tokstr;
  87         int tval;
  88 } toktab[]= {
  89         { "default",    DEFAULT },
  90         { "login",      LOGIN },
  91         { "password",   PASSWD },
  92         { "passwd",     PASSWD },
  93         { "account",    ACCOUNT },
  94         { "machine",    MACH },
  95         { "macdef",     MACDEF },
  96         { NULL,         0 }
  97 };
  98
  99 static int
 100 token()
 101 {
 102         char *cp;
 103         int c;
 104         struct toktab *t;
 105
 106         if (feof(cfile) || ferror(cfile))
 107                 return (0);
 108         while ((c = getc(cfile)) != EOF &&
 109             (c == '\n' || c == '\t' || c == ' ' || c == ','))
 110                 continue;
 111         if (c == EOF)
 112                 return (0);
 113         cp = tokval;
 114         if (c == '"') {
 115                 while ((c = getc(cfile)) != EOF && c != '"') {
 116                         if (c == '\\')
 117                                 c = getc(cfile);
 118                         *cp++ = c;
 119                 }
 120         } else {
 121                 *cp++ = c;
 122                 while ((c = getc(cfile)) != EOF
 123                     && c != '\n' && c != '\t' && c != ' ' && c != ',') {
 124                         if (c == '\\')
 125                                 c = getc(cfile);
 126                         *cp++ = c;
 127                 }
 128         }
 129         *cp = 0;
 130         if (tokval[0] == 0)
 131                 return (0);
 132         for (t = toktab; t->tokstr; t++)
 133                 if (!strcmp(t->tokstr, tokval))
 134                         return (t->tval);
 135         return (ID);
 136 }
 137
 138 static int
 139 ruserpass(host, aname, apass, aacct)
 140         char *host, **aname, **apass, **aacct;
 141 {
 142         char *hdir, buf[BUFSIZ], *tmp;
 143         char myname[MAXHOSTNAMELEN], *mydomain;
 144         int t, i, c, usedefault = 0;
 145         struct stat stb;
 146
 147         hdir = getenv("HOME");
 148         if (hdir == NULL)
 149                 hdir = ".";
 150         if (strlen(hdir) + 8 > sizeof(buf))
 151                 return (0);
 152         (void) sprintf(buf, "%s/.netrc", hdir);
 153         cfile = fopen(buf, "r");
 154         if (cfile == NULL) {
 155                 if (errno != ENOENT)
 156                         warn("%s", buf);
 157                 return (0);
 158         }
 159         if (gethostname(myname, sizeof(myname)) < 0)
 160                 myname[0] = '\0';
 161         if ((mydomain = strchr(myname, '.')) == NULL)
 162                 mydomain = "";
 163 next:
 164         while ((t = token())) switch(t) {
 165
 166         case DEFAULT:
 167                 usedefault = 1;
 168                 /* FALL THROUGH */
 169
 170         case MACH:
 171                 if (!usedefault) {
 172                         if (token() != ID)
 173                                 continue;
 174                         /*
 175                          * Allow match either for user's input host name
 176                          * or official hostname.  Also allow match of
 177                          * incompletely-specified host in local domain.
 178                          */
 179                         if (strcasecmp(host, tokval) == 0)
 180                                 goto match;
 181                         if ((tmp = strchr(host, '.')) != NULL &&
 182                             strcasecmp(tmp, mydomain) == 0 &&
 183                             strncasecmp(host, tokval, tmp - host) == 0 &&
 184                             tokval[tmp - host] == '\0')
 185                                 goto match;
 186                         continue;
 187                 }
 188         match:
 189                 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) {
 190
 191                 case LOGIN:
 192                         if (token())
 193                                 if (*aname == 0) {
 194                                         *aname = malloc((unsigned) strlen(tokval) + 1);
 195                                         (void) strcpy(*aname, tokval);
 196                                 } else {
 197                                         if (strcmp(*aname, tokval))
 198                                                 goto next;
 199                                 }
 200                         break;
 201                 case PASSWD:
 202                         if ((*aname == 0 || strcmp(*aname, "anonymous")) &&
 203                             fstat(fileno(cfile), &stb) >= 0 &&
 204                             (stb.st_mode & 077) != 0) {
 205         warnx("Error: .netrc file is readable by others.");
 206         warnx("Remove password or make file unreadable by others.");
 207                                 goto bad;
 208                         }
 209                         if (token() && *apass == 0) {
 210                                 *apass = malloc((unsigned) strlen(tokval) + 1);
 211                                 (void) strcpy(*apass, tokval);
 212                         }
 213                         break;
 214                 case ACCOUNT:
 215                         if (fstat(fileno(cfile), &stb) >= 0
 216                             && (stb.st_mode & 077) != 0) {
 217         warnx("Error: .netrc file is readable by others.");
 218         warnx("Remove account or make file unreadable by others.");
 219                                 goto bad;
 220                         }
 221                         if (token() && *aacct == 0) {
 222                                 *aacct = malloc((unsigned) strlen(tokval) + 1);
 223                                 (void) strcpy(*aacct, tokval);
 224                         }
 225                         break;
 226                 case MACDEF:
 227                         while ((c=getc(cfile)) != EOF &&
 228                                                 (c == ' ' || c == '\t'))
 229                                 ;
 230                         if (c == EOF || c == '\n') {
 231                                 printf("Missing macdef name argument.\n");
 232                                 goto bad;
 233                         }
 234                         if (macnum == 16) {
 235                                 printf("Limit of 16 macros have already been defined\n");
 236                                 goto bad;
 237                         }
 238                         tmp = macros[macnum].mac_name;
 239                         *tmp++ = c;
 240                         for (i=0; i < 8 && (c=getc(cfile)) != EOF &&
 241                             !isspace(c); ++i) {
 242                                 *tmp++ = c;
 243                         }
 244                         if (c == EOF) {
 245                                 printf("Macro definition missing null line terminator.\n");
 246                                 goto bad;
 247                         }
 248                         *tmp = '\0';
 249                         if (c != '\n') {
 250                                 while ((c=getc(cfile)) != EOF && c != '\n');
 251                         }
 252                         if (c == EOF) {
 253                                 printf("Macro definition missing null line terminator.\n");
 254                                 goto bad;
 255                         }
 256                         if (macnum == 0) {
 257                                 macros[macnum].mac_start = macbuf;
 258                         }
 259                         else {
 260                                 macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
 261                         }
 262                         tmp = macros[macnum].mac_start;
 263                         while (tmp != macbuf + 4096) {
 264                                 if ((c=getc(cfile)) == EOF) {
 265                                 printf("Macro definition missing null line terminator.\n");
 266                                         goto bad;
 267                                 }
 268                                 *tmp = c;
 269                                 if (*tmp == '\n') {
 270                                         if (*(tmp-1) == '\0') {
 271                                            macros[macnum++].mac_end = tmp - 1;
 272                                            break;
 273                                         }
 274                                         *tmp = '\0';
 275                                 }
 276                                 tmp++;
 277                         }
 278                         if (tmp == macbuf + 4096) {
 279                                 printf("4K macro buffer exceeded\n");
 280                                 goto bad;
 281                         }
 282                         break;
 283                 default:
 284                         warnx("Unknown .netrc keyword %s", tokval);
 285                         break;
 286                 }
 287                 goto done;
 288         }
 289 done:
 290         (void) fclose(cfile);
 291         return (0);
 292 bad:
 293         (void) fclose(cfile);
 294         return (-1);
 295 }
 296
 297 int
 298 rexec(ahost, rport, name, pass, cmd, fd2p)
 299         char **ahost;
 300         int rport;
 301         char *name, *pass, *cmd;
 302         int *fd2p;
 303 {
 304         struct sockaddr_in sin, sin2, from;
 305         struct hostent *hp;
 306         u_short port;
 307         int s, timo = 1, s3;
 308         char c;
 309         char *acct = NULL;
 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, &acct);
 318         if (acct != NULL)
 319                 free(acct);
 320 retry:
 321         s = socket(AF_INET, SOCK_STREAM, 0);
 322         if (s < 0) {
 323                 perror("rexec: socket");
 324                 return (-1);
 325         }
 326         sin.sin_family = hp->h_addrtype;
 327         sin.sin_port = rport;
 328         bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
 329         if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 330                 if (errno == ECONNREFUSED && timo <= 16) {
 331                         (void) close(s);
 332                         sleep(timo);
 333                         timo *= 2;
 334                         goto retry;
 335                 }
 336                 perror(hp->h_name);
 337                 return (-1);
 338         }
 339         if (fd2p == 0) {
 340                 (void) write(s, "", 1);
 341                 port = 0;
 342         } else {
 343                 char num[8];
 344                 int s2, sin2len;
 345
 346                 s2 = socket(AF_INET, SOCK_STREAM, 0);
 347                 if (s2 < 0) {
 348                         (void) close(s);
 349                         return (-1);
 350                 }
 351                 listen(s2, 1);
 352                 sin2len = sizeof (sin2);
 353                 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
 354                   sin2len != sizeof (sin2)) {
 355                         perror("getsockname");
 356                         (void) close(s2);
 357                         goto bad;
 358                 }
 359                 port = ntohs((u_short)sin2.sin_port);
 360                 (void) sprintf(num, "%u", port);
 361                 (void) write(s, num, strlen(num)+1);
 362                 { int len = sizeof (from);
 363                   s3 = accept(s2, (struct sockaddr *)&from, &len);
 364                   close(s2);
 365                   if (s3 < 0) {
 366                         perror("accept");
 367                         port = 0;
 368                         goto bad;
 369                   }
 370                 }
 371                 *fd2p = s3;
 372         }
 373         (void) write(s, name, strlen(name) + 1);
 374         /* should public key encypt the password here */
 375         (void) write(s, pass, strlen(pass) + 1);
 376         (void) write(s, cmd, strlen(cmd) + 1);
 377         if (read(s, &c, 1) != 1) {
 378                 perror(*ahost);
 379                 goto bad;
 380         }
 381         if (c != 0) {
 382                 while (read(s, &c, 1) == 1) {
 383                         (void) write(2, &c, 1);
 384                         if (c == '\n')
 385                                 break;
 386                 }
 387                 goto bad;
 388         }
 389         return (s);
 390 bad:
 391         if (port)
 392                 (void) close(*fd2p);
 393         (void) close(s);
 394         return (-1);
 395 }