ruserpass.c 8.2 KB

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  1. /*
  2. * Copyright (c) 1985, 1993, 1994
  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. * 4. Neither the name of the University nor the names of its contributors
  14. * may be used to endorse or promote products derived from this software
  15. * without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE.
  28. */
  29. #define __FORCE_GLIBC
  30. #include <features.h>
  31. #include <sys/types.h>
  32. #include <sys/stat.h>
  33. #include <ctype.h>
  34. #include <err.h>
  35. #include <errno.h>
  36. #include <netdb.h>
  37. #include <stdio.h>
  38. #include <stdio_ext.h>
  39. #include <stdlib.h>
  40. #include <string.h>
  41. #include <unistd.h>
  42. #define _(X) (X)
  43. /* #include "ftp_var.h" */
  44. static int token (void);
  45. static FILE *cfile;
  46. #define DEFAULT 1
  47. #define LOGIN 2
  48. #define PASSWD 3
  49. #define ACCOUNT 4
  50. #define MACDEF 5
  51. #define ID 10
  52. #define MACHINE 11
  53. static char tokval[100];
  54. static const char tokstr[] =
  55. {
  56. #define TOK_DEFAULT_IDX 0
  57. "default\0"
  58. #define TOK_LOGIN_IDX (TOK_DEFAULT_IDX + sizeof "default")
  59. "login\0"
  60. #define TOK_PASSWORD_IDX (TOK_LOGIN_IDX + sizeof "login")
  61. "password\0"
  62. #define TOK_PASSWD_IDX (TOK_PASSWORD_IDX + sizeof "password")
  63. "passwd\0"
  64. #define TOK_ACCOUNT_IDX (TOK_PASSWD_IDX + sizeof "passwd")
  65. "account\0"
  66. #define TOK_MACHINE_IDX (TOK_ACCOUNT_IDX + sizeof "account")
  67. "machine\0"
  68. #define TOK_MACDEF_IDX (TOK_MACHINE_IDX + sizeof "machine")
  69. "macdef"
  70. };
  71. static const struct toktab {
  72. int tokstr_off;
  73. int tval;
  74. } toktab[]= {
  75. { TOK_DEFAULT_IDX, DEFAULT },
  76. { TOK_LOGIN_IDX, LOGIN },
  77. { TOK_PASSWORD_IDX, PASSWD },
  78. { TOK_PASSWD_IDX, PASSWD },
  79. { TOK_ACCOUNT_IDX, ACCOUNT },
  80. { TOK_MACHINE_IDX, MACHINE },
  81. { TOK_MACDEF_IDX, MACDEF }
  82. };
  83. int ruserpass(const char *host, const char **aname, const char **apass)
  84. {
  85. char *hdir, *buf, *tmp;
  86. char myname[1024], *mydomain;
  87. int t, usedefault = 0;
  88. struct stat64 stb;
  89. /* Give up when running a setuid or setgid app. */
  90. if ((getuid() != geteuid()) || getgid() != getegid())
  91. return -1;
  92. hdir = getenv("HOME");
  93. if (hdir == NULL) {
  94. /* If we can't get HOME, fail instead of trying ".",
  95. which is no improvement. */
  96. return -1;
  97. }
  98. buf = alloca (strlen(hdir) + 8);
  99. strcpy(buf, hdir);
  100. strcat(buf, "/.netrc");
  101. cfile = fopen(buf, "r");
  102. if (cfile == NULL) {
  103. if (errno != ENOENT)
  104. printf("%s", buf);
  105. return (0);
  106. }
  107. /* No threads use this stream. */
  108. __fsetlocking (cfile, FSETLOCKING_BYCALLER);
  109. if (gethostname(myname, sizeof(myname)) < 0)
  110. myname[0] = '\0';
  111. mydomain = strchr(myname, '.');
  112. if (mydomain==NULL) {
  113. mydomain=myname + strlen(myname);
  114. }
  115. next:
  116. while ((t = token())) switch(t) {
  117. case DEFAULT:
  118. usedefault = 1;
  119. /* FALL THROUGH */
  120. case MACHINE:
  121. if (!usedefault) {
  122. if (token() != ID)
  123. continue;
  124. /*
  125. * Allow match either for user's input host name
  126. * or official hostname. Also allow match of
  127. * incompletely-specified host in local domain.
  128. */
  129. if (strcasecmp(host, tokval) == 0)
  130. goto match;
  131. /* if (__strcasecmp(hostname, tokval) == 0)
  132. goto match;
  133. if ((tmp = strchr(hostname, '.')) != NULL &&
  134. __strcasecmp(tmp, mydomain) == 0 &&
  135. __strncasecmp(hostname, tokval, tmp-hostname) == 0 &&
  136. tokval[tmp - hostname] == '\0')
  137. goto match; */
  138. if ((tmp = strchr(host, '.')) != NULL &&
  139. strcasecmp(tmp, mydomain) == 0 &&
  140. strncasecmp(host, tokval, tmp - host) == 0 &&
  141. tokval[tmp - host] == '\0')
  142. goto match;
  143. continue;
  144. }
  145. match:
  146. while ((t = token()) && t != MACHINE && t != DEFAULT) switch(t) {
  147. case LOGIN:
  148. if (token()) {
  149. if (*aname == 0) {
  150. char *newp;
  151. newp = malloc((unsigned) strlen(tokval) + 1);
  152. if (newp == NULL)
  153. {
  154. printf(_("out of memory"));
  155. goto bad;
  156. }
  157. *aname = strcpy(newp, tokval);
  158. } else {
  159. if (strcmp(*aname, tokval))
  160. goto next;
  161. }
  162. }
  163. break;
  164. case PASSWD:
  165. if (strcmp(*aname, "anonymous") &&
  166. fstat64(fileno(cfile), &stb) >= 0 &&
  167. (stb.st_mode & 077) != 0) {
  168. printf(_("Error: .netrc file is readable by others."));
  169. printf(_("Remove password or make file unreadable by others."));
  170. goto bad;
  171. }
  172. if (token() && *apass == 0) {
  173. char *newp;
  174. newp = malloc((unsigned) strlen(tokval) + 1);
  175. if (newp == NULL)
  176. {
  177. printf(_("out of memory"));
  178. goto bad;
  179. }
  180. *apass = strcpy(newp, tokval);
  181. }
  182. break;
  183. case ACCOUNT:
  184. #if 0
  185. if (fstat64(fileno(cfile), &stb) >= 0
  186. && (stb.st_mode & 077) != 0) {
  187. printf("Error: .netrc file is readable by others.");
  188. printf("Remove account or make file unreadable by others.");
  189. goto bad;
  190. }
  191. if (token() && *aacct == 0) {
  192. *aacct = malloc((unsigned) strlen(tokval) + 1);
  193. (void) strcpy(*aacct, tokval);
  194. }
  195. #endif
  196. break;
  197. case MACDEF:
  198. #if 0
  199. if (proxy) {
  200. (void) fclose(cfile);
  201. return (0);
  202. }
  203. while ((c=getc_unlocked(cfile)) != EOF && c == ' '
  204. || c == '\t');
  205. if (c == EOF || c == '\n') {
  206. printf("Missing macdef name argument.\n");
  207. goto bad;
  208. }
  209. if (macnum == 16) {
  210. printf("Limit of 16 macros have already been defined\n");
  211. goto bad;
  212. }
  213. tmp = macros[macnum].mac_name;
  214. *tmp++ = c;
  215. for (i=0; i < 8 && (c=getc_unlocked(cfile)) != EOF &&
  216. !isspace(c); ++i) {
  217. *tmp++ = c;
  218. }
  219. if (c == EOF) {
  220. printf("Macro definition missing null line terminator.\n");
  221. goto bad;
  222. }
  223. *tmp = '\0';
  224. if (c != '\n') {
  225. while ((c=getc_unlocked(cfile)) != EOF
  226. && c != '\n');
  227. }
  228. if (c == EOF) {
  229. printf("Macro definition missing null line terminator.\n");
  230. goto bad;
  231. }
  232. if (macnum == 0) {
  233. macros[macnum].mac_start = macbuf;
  234. }
  235. else {
  236. macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
  237. }
  238. tmp = macros[macnum].mac_start;
  239. while (tmp != macbuf + 4096) {
  240. if ((c=getc_unlocked(cfile)) == EOF) {
  241. printf("Macro definition missing null line terminator.\n");
  242. goto bad;
  243. }
  244. *tmp = c;
  245. if (*tmp == '\n') {
  246. if (*(tmp-1) == '\0') {
  247. macros[macnum++].mac_end = tmp - 1;
  248. break;
  249. }
  250. *tmp = '\0';
  251. }
  252. tmp++;
  253. }
  254. if (tmp == macbuf + 4096) {
  255. printf("4K macro buffer exceeded\n");
  256. goto bad;
  257. }
  258. #endif
  259. break;
  260. default:
  261. printf(_("Unknown .netrc keyword %s"), tokval);
  262. break;
  263. }
  264. goto done;
  265. }
  266. done:
  267. (void) fclose(cfile);
  268. return (0);
  269. bad:
  270. (void) fclose(cfile);
  271. return (-1);
  272. }
  273. static int
  274. token()
  275. {
  276. char *cp;
  277. int c;
  278. int i;
  279. if (feof_unlocked(cfile) || ferror_unlocked(cfile))
  280. return (0);
  281. while ((c = getc_unlocked(cfile)) != EOF &&
  282. (c == '\n' || c == '\t' || c == ' ' || c == ','))
  283. continue;
  284. if (c == EOF)
  285. return (0);
  286. cp = tokval;
  287. if (c == '"') {
  288. while ((c = getc_unlocked(cfile)) != EOF && c != '"') {
  289. if (c == '\\')
  290. c = getc_unlocked(cfile);
  291. *cp++ = c;
  292. }
  293. } else {
  294. *cp++ = c;
  295. while ((c = getc_unlocked(cfile)) != EOF
  296. && c != '\n' && c != '\t' && c != ' ' && c != ',') {
  297. if (c == '\\')
  298. c = getc_unlocked(cfile);
  299. *cp++ = c;
  300. }
  301. }
  302. *cp = 0;
  303. if (tokval[0] == 0)
  304. return (0);
  305. for (i = 0; i < (int) (sizeof (toktab) / sizeof (toktab[0])); ++i)
  306. if (!strcmp(&tokstr[toktab[i].tokstr_off], tokval))
  307. return toktab[i].tval;
  308. return (ID);
  309. }