ruserpass.c revision 1.10
1 /* $NetBSD: ruserpass.c,v 1.10 2003/10/21 00:16:55 fvdl 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. 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 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)ruserpass.c 8.4 (Berkeley) 4/27/95"; 36 #else 37 __RCSID("$NetBSD: ruserpass.c,v 1.10 2003/10/21 00:16:55 fvdl Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <sys/param.h> 44 45 #include <assert.h> 46 #include <ctype.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 struct macel { 55 char mac_name[9]; /* macro name */ 56 char *mac_start; /* start of macro in macbuf */ 57 char *mac_end; /* end of macro in macbuf */ 58 }; 59 60 static int token __P((void)); 61 static FILE *cfile; 62 static int macnum; /* number of defined macros */ 63 static struct macel macros[16]; 64 static char macbuf[4096]; 65 66 #define DEFAULT 1 67 #define LOGIN 2 68 #define PASSWD 3 69 #define ACCOUNT 4 70 #define MACDEF 5 71 #define ID 10 72 #define MACH 11 73 74 static char tokval[100]; 75 76 static struct toktab { 77 char *tokstr; 78 int tval; 79 } toktab[]= { 80 { "default", DEFAULT }, 81 { "login", LOGIN }, 82 { "password", PASSWD }, 83 { "passwd", PASSWD }, 84 { "account", ACCOUNT }, 85 { "machine", MACH }, 86 { "macdef", MACDEF }, 87 { NULL, 0 } 88 }; 89 90 int ruserpass __P((const char *, char **, char **)); 91 92 int 93 ruserpass(host, aname, apass) 94 const char *host; 95 char **aname, **apass; 96 { 97 char *hdir, buf[BUFSIZ], *tmp; 98 char myname[MAXHOSTNAMELEN + 1], *mydomain; 99 int t, i, c, usedefault = 0; 100 struct stat stb; 101 102 _DIAGASSERT(host != NULL); 103 _DIAGASSERT(aname != NULL); 104 _DIAGASSERT(apass != NULL); 105 106 hdir = getenv("HOME"); 107 if (hdir == NULL) 108 hdir = "."; 109 if (strlen(hdir) + sizeof(".netrc") < sizeof(buf)) { 110 (void)snprintf(buf, sizeof buf, "%s/.netrc", hdir); 111 } else { 112 warnx("%s/.netrc: %s", hdir, strerror(ENAMETOOLONG)); 113 return (0); 114 } 115 cfile = fopen(buf, "r"); 116 if (cfile == NULL) { 117 if (errno != ENOENT) 118 warn("%s", buf); 119 return (0); 120 } 121 if (gethostname(myname, sizeof(myname)) < 0) 122 myname[0] = '\0'; 123 else 124 myname[sizeof(myname) - 1] = '\0'; 125 if ((mydomain = strchr(myname, '.')) == NULL) 126 mydomain = ""; 127 next: 128 while ((t = token()) != 0) switch(t) { 129 130 case DEFAULT: 131 usedefault = 1; 132 /* FALLTHROUGH */ 133 134 case MACH: 135 if (!usedefault) { 136 if (token() != ID) 137 continue; 138 /* 139 * Allow match either for user's input host name 140 * or official hostname. Also allow match of 141 * incompletely-specified host in local domain. 142 */ 143 if (strcasecmp(host, tokval) == 0) 144 goto match; 145 if ((tmp = strchr(host, '.')) != NULL && 146 strcasecmp(tmp, mydomain) == 0 && 147 strncasecmp(host, tokval, 148 (size_t)(tmp - host)) == 0 && 149 tokval[tmp - host] == '\0') 150 goto match; 151 continue; 152 } 153 match: 154 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) { 155 156 case LOGIN: 157 if (token()) { 158 if (*aname == NULL) { 159 *aname = strdup(tokval); 160 if (*aname == NULL) 161 err(1, "can't strdup *aname"); 162 } else { 163 if (strcmp(*aname, tokval)) 164 goto next; 165 } 166 } 167 break; 168 case PASSWD: 169 if ((*aname == NULL || strcmp(*aname, "anonymous")) && 170 fstat(fileno(cfile), &stb) >= 0 && 171 (stb.st_mode & 077) != 0) { 172 warnx("Error: .netrc file is readable by others."); 173 warnx("Remove password or make file unreadable by others."); 174 goto bad; 175 } 176 if (token() && *apass == NULL) { 177 *apass = strdup(tokval); 178 if (*apass == NULL) 179 err(1, "can't strdup *apass"); 180 } 181 break; 182 case ACCOUNT: 183 if (fstat(fileno(cfile), &stb) >= 0 184 && (stb.st_mode & 077) != 0) { 185 warnx("Error: .netrc file is readable by others."); 186 warnx("Remove account or make file unreadable by others."); 187 goto bad; 188 } 189 break; 190 case MACDEF: 191 while ((c=getc(cfile)) != EOF) 192 if (c != ' ' && c != '\t') 193 break; 194 if (c == EOF || c == '\n') { 195 puts("Missing macdef name argument."); 196 goto bad; 197 } 198 if (macnum == 16) { 199 puts( 200 "Limit of 16 macros have already been defined."); 201 goto bad; 202 } 203 tmp = macros[macnum].mac_name; 204 *tmp++ = c; 205 for (i=0; i < 8 && (c=getc(cfile)) != EOF && 206 !isspace(c); ++i) { 207 *tmp++ = c; 208 } 209 if (c == EOF) { 210 puts( 211 "Macro definition missing null line terminator."); 212 goto bad; 213 } 214 *tmp = '\0'; 215 if (c != '\n') { 216 while ((c=getc(cfile)) != EOF && c != '\n'); 217 } 218 if (c == EOF) { 219 puts( 220 "Macro definition missing null line terminator."); 221 goto bad; 222 } 223 if (macnum == 0) { 224 macros[macnum].mac_start = macbuf; 225 } 226 else { 227 macros[macnum].mac_start = 228 macros[macnum-1].mac_end + 1; 229 } 230 tmp = macros[macnum].mac_start; 231 while (tmp != macbuf + 4096) { 232 if ((c=getc(cfile)) == EOF) { 233 puts( 234 "Macro definition missing null line terminator."); 235 goto bad; 236 } 237 *tmp = c; 238 if (*tmp == '\n') { 239 if (*(tmp-1) == '\0') { 240 macros[macnum++].mac_end = tmp - 1; 241 break; 242 } 243 *tmp = '\0'; 244 } 245 tmp++; 246 } 247 if (tmp == macbuf + 4096) { 248 puts("4K macro buffer exceeded."); 249 goto bad; 250 } 251 break; 252 default: 253 warnx("Unknown .netrc keyword %s", tokval); 254 break; 255 } 256 goto done; 257 } 258 done: 259 (void)fclose(cfile); 260 return (0); 261 bad: 262 (void)fclose(cfile); 263 return (-1); 264 } 265 266 static int 267 token() 268 { 269 char *cp; 270 int c; 271 struct toktab *t; 272 273 if (feof(cfile) || ferror(cfile)) 274 return (0); 275 while ((c = getc(cfile)) != EOF && 276 (c == '\n' || c == '\t' || c == ' ' || c == ',')) 277 continue; 278 if (c == EOF) 279 return (0); 280 cp = tokval; 281 if (c == '"') { 282 while ((c = getc(cfile)) != EOF && c != '"') { 283 if (c == '\\') 284 c = getc(cfile); 285 *cp++ = c; 286 } 287 } else { 288 *cp++ = c; 289 while ((c = getc(cfile)) != EOF 290 && c != '\n' && c != '\t' && c != ' ' && c != ',') { 291 if (c == '\\') 292 c = getc(cfile); 293 *cp++ = c; 294 } 295 } 296 *cp = 0; 297 if (tokval[0] == 0) 298 return (0); 299 for (t = toktab; t->tokstr; t++) 300 if (!strcmp(t->tokstr, tokval)) 301 return (t->tval); 302 return (ID); 303 } 304
Indexes created Tue Sep 23 07:09:52 GMT 2025