1 /* $NetBSD: ruserpass.c,v 1.4 1998/08/19 00:17:41 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1993, 1994 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)ruserpass.c 8.4 (Berkeley) 4/27/95"; 40 #else 41 __RCSID("$NetBSD: ruserpass.c,v 1.4 1998/08/19 00:17:41 thorpej Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 #include <sys/param.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 struct macel { 58 char mac_name[9]; /* macro name */ 59 char *mac_start; /* start of macro in macbuf */ 60 char *mac_end; /* end of macro in macbuf */ 61 }; 62 63 static int token __P((void)); 64 static FILE *cfile; 65 static int macnum; /* number of defined macros */ 66 static struct macel macros[16]; 67 static char macbuf[4096]; 68 69 #define DEFAULT 1 70 #define LOGIN 2 71 #define PASSWD 3 72 #define ACCOUNT 4 73 #define MACDEF 5 74 #define ID 10 75 #define MACH 11 76 77 static char tokval[100]; 78 79 static struct toktab { 80 char *tokstr; 81 int tval; 82 } toktab[]= { 83 { "default", DEFAULT }, 84 { "login", LOGIN }, 85 { "password", PASSWD }, 86 { "passwd", PASSWD }, 87 { "account", ACCOUNT }, 88 { "machine", MACH }, 89 { "macdef", MACDEF }, 90 { NULL, 0 } 91 }; 92 93 int ruserpass __P((const char *, char **, char **)); 94 95 int 96 ruserpass(host, aname, apass) 97 const char *host; 98 char **aname, **apass; 99 { 100 char *hdir, buf[BUFSIZ], *tmp; 101 char myname[MAXHOSTNAMELEN + 1], *mydomain; 102 int t, i, c, usedefault = 0; 103 struct stat stb; 104 105 hdir = getenv("HOME"); 106 if (hdir == NULL) 107 hdir = "."; 108 if (strlen(hdir) + sizeof(".netrc") < sizeof(buf)) { 109 (void)snprintf(buf, sizeof buf, "%s/.netrc", hdir); 110 } else { 111 warnx("%s/.netrc: %s", hdir, strerror(ENAMETOOLONG)); 112 return (0); 113 } 114 cfile = fopen(buf, "r"); 115 if (cfile == NULL) { 116 if (errno != ENOENT) 117 warn("%s", buf); 118 return (0); 119 } 120 if (gethostname(myname, sizeof(myname)) < 0) 121 myname[0] = '\0'; 122 else 123 myname[sizeof(myname) - 1] = '\0'; 124 if ((mydomain = strchr(myname, '.')) == NULL) 125 mydomain = ""; 126 next: 127 while ((t = token())) switch(t) { 128 129 case DEFAULT: 130 usedefault = 1; 131 /* FALL THROUGH */ 132 133 case MACH: 134 if (!usedefault) { 135 if (token() != ID) 136 continue; 137 /* 138 * Allow match either for user's input host name 139 * or official hostname. Also allow match of 140 * incompletely-specified host in local domain. 141 */ 142 if (strcasecmp(host, tokval) == 0) 143 goto match; 144 if ((tmp = strchr(host, '.')) != NULL && 145 strcasecmp(tmp, mydomain) == 0 && 146 strncasecmp(host, tokval, tmp - host) == 0 && 147 tokval[tmp - host] == '\0') 148 goto match; 149 continue; 150 } 151 match: 152 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) { 153 154 case LOGIN: 155 if (token()) { 156 if (*aname == NULL) { 157 *aname = strdup(tokval); 158 if (*aname == NULL) 159 err(1, "can't strdup *aname"); 160 } else { 161 if (strcmp(*aname, tokval)) 162 goto next; 163 } 164 } 165 break; 166 case PASSWD: 167 if ((*aname == NULL || strcmp(*aname, "anonymous")) && 168 fstat(fileno(cfile), &stb) >= 0 && 169 (stb.st_mode & 077) != 0) { 170 warnx("Error: .netrc file is readable by others."); 171 warnx("Remove password or make file unreadable by others."); 172 goto bad; 173 } 174 if (token() && *apass == NULL) { 175 *apass = strdup(tokval); 176 if (*apass == NULL) 177 err(1, "can't strdup *apass"); 178 } 179 break; 180 case ACCOUNT: 181 if (fstat(fileno(cfile), &stb) >= 0 182 && (stb.st_mode & 077) != 0) { 183 warnx("Error: .netrc file is readable by others."); 184 warnx("Remove account or make file unreadable by others."); 185 goto bad; 186 } 187 break; 188 case MACDEF: 189 while ((c=getc(cfile)) != EOF) 190 if (c != ' ' && c != '\t') 191 break; 192 if (c == EOF || c == '\n') { 193 puts("Missing macdef name argument."); 194 goto bad; 195 } 196 if (macnum == 16) { 197 puts( 198 "Limit of 16 macros have already been defined."); 199 goto bad; 200 } 201 tmp = macros[macnum].mac_name; 202 *tmp++ = c; 203 for (i=0; i < 8 && (c=getc(cfile)) != EOF && 204 !isspace(c); ++i) { 205 *tmp++ = c; 206 } 207 if (c == EOF) { 208 puts( 209 "Macro definition missing null line terminator."); 210 goto bad; 211 } 212 *tmp = '\0'; 213 if (c != '\n') { 214 while ((c=getc(cfile)) != EOF && c != '\n'); 215 } 216 if (c == EOF) { 217 puts( 218 "Macro definition missing null line terminator."); 219 goto bad; 220 } 221 if (macnum == 0) { 222 macros[macnum].mac_start = macbuf; 223 } 224 else { 225 macros[macnum].mac_start = 226 macros[macnum-1].mac_end + 1; 227 } 228 tmp = macros[macnum].mac_start; 229 while (tmp != macbuf + 4096) { 230 if ((c=getc(cfile)) == EOF) { 231 puts( 232 "Macro definition missing null line terminator."); 233 goto bad; 234 } 235 *tmp = c; 236 if (*tmp == '\n') { 237 if (*(tmp-1) == '\0') { 238 macros[macnum++].mac_end = tmp - 1; 239 break; 240 } 241 *tmp = '\0'; 242 } 243 tmp++; 244 } 245 if (tmp == macbuf + 4096) { 246 puts("4K macro buffer exceeded."); 247 goto bad; 248 } 249 break; 250 default: 251 warnx("Unknown .netrc keyword %s", tokval); 252 break; 253 } 254 goto done; 255 } 256 done: 257 (void)fclose(cfile); 258 return (0); 259 bad: 260 (void)fclose(cfile); 261 return (-1); 262 } 263 264 static int 265 token() 266 { 267 char *cp; 268 int c; 269 struct toktab *t; 270 271 if (feof(cfile) || ferror(cfile)) 272 return (0); 273 while ((c = getc(cfile)) != EOF && 274 (c == '\n' || c == '\t' || c == ' ' || c == ',')) 275 continue; 276 if (c == EOF) 277 return (0); 278 cp = tokval; 279 if (c == '"') { 280 while ((c = getc(cfile)) != EOF && c != '"') { 281 if (c == '\\') 282 c = getc(cfile); 283 *cp++ = c; 284 } 285 } else { 286 *cp++ = c; 287 while ((c = getc(cfile)) != EOF 288 && c != '\n' && c != '\t' && c != ' ' && c != ',') { 289 if (c == '\\') 290 c = getc(cfile); 291 *cp++ = c; 292 } 293 } 294 *cp = 0; 295 if (tokval[0] == 0) 296 return (0); 297 for (t = toktab; t->tokstr; t++) 298 if (!strcmp(t->tokstr, tokval)) 299 return (t->tval); 300 return (ID); 301 } 302