ruserpass.c revision 1.7
1 /* $NetBSD: ruserpass.c,v 1.7 1999/09/20 04:48:04 lukem 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 1.7 1999/09/20 04:48:04 lukem 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 <assert.h> 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 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 static int token __P((void)); 65 static FILE *cfile; 66 static int macnum; /* number of defined macros */ 67 static struct macel macros[16]; 68 static char macbuf[4096]; 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 int ruserpass __P((const char *, char **, char **)); 95 96 int 97 ruserpass(host, aname, apass) 98 const char *host; 99 char **aname, **apass; 100 { 101 char *hdir, buf[BUFSIZ], *tmp; 102 char myname[MAXHOSTNAMELEN + 1], *mydomain; 103 int t, i, c, usedefault = 0; 104 struct stat stb; 105 106 _DIAGASSERT(host != NULL); 107 _DIAGASSERT(aname != NULL); 108 _DIAGASSERT(apass != NULL); 109 110 hdir = getenv("HOME"); 111 if (hdir == NULL) 112 hdir = "."; 113 if (strlen(hdir) + sizeof(".netrc") < sizeof(buf)) { 114 (void)snprintf(buf, sizeof buf, "%s/.netrc", hdir); 115 } else { 116 warnx("%s/.netrc: %s", hdir, strerror(ENAMETOOLONG)); 117 return (0); 118 } 119 cfile = fopen(buf, "r"); 120 if (cfile == NULL) { 121 if (errno != ENOENT) 122 warn("%s", buf); 123 return (0); 124 } 125 if (gethostname(myname, sizeof(myname)) < 0) 126 myname[0] = '\0'; 127 else 128 myname[sizeof(myname) - 1] = '\0'; 129 if ((mydomain = strchr(myname, '.')) == NULL) 130 mydomain = ""; 131 next: 132 while ((t = token()) != NULL) switch(t) { 133 134 case DEFAULT: 135 usedefault = 1; 136 /* FALLTHROUGH */ 137 138 case MACH: 139 if (!usedefault) { 140 if (token() != ID) 141 continue; 142 /* 143 * Allow match either for user's input host name 144 * or official hostname. Also allow match of 145 * incompletely-specified host in local domain. 146 */ 147 if (strcasecmp(host, tokval) == 0) 148 goto match; 149 if ((tmp = strchr(host, '.')) != NULL && 150 strcasecmp(tmp, mydomain) == 0 && 151 strncasecmp(host, tokval, 152 (size_t)(tmp - host)) == 0 && 153 tokval[tmp - host] == '\0') 154 goto match; 155 continue; 156 } 157 match: 158 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) { 159 160 case LOGIN: 161 if (token()) { 162 if (*aname == NULL) { 163 *aname = strdup(tokval); 164 if (*aname == NULL) 165 err(1, "can't strdup *aname"); 166 } else { 167 if (strcmp(*aname, tokval)) 168 goto next; 169 } 170 } 171 break; 172 case PASSWD: 173 if ((*aname == NULL || strcmp(*aname, "anonymous")) && 174 fstat(fileno(cfile), &stb) >= 0 && 175 (stb.st_mode & 077) != 0) { 176 warnx("Error: .netrc file is readable by others."); 177 warnx("Remove password or make file unreadable by others."); 178 goto bad; 179 } 180 if (token() && *apass == NULL) { 181 *apass = strdup(tokval); 182 if (*apass == NULL) 183 err(1, "can't strdup *apass"); 184 } 185 break; 186 case ACCOUNT: 187 if (fstat(fileno(cfile), &stb) >= 0 188 && (stb.st_mode & 077) != 0) { 189 warnx("Error: .netrc file is readable by others."); 190 warnx("Remove account or make file unreadable by others."); 191 goto bad; 192 } 193 break; 194 case MACDEF: 195 while ((c=getc(cfile)) != EOF) 196 if (c != ' ' && c != '\t') 197 break; 198 if (c == EOF || c == '\n') { 199 puts("Missing macdef name argument."); 200 goto bad; 201 } 202 if (macnum == 16) { 203 puts( 204 "Limit of 16 macros have already been defined."); 205 goto bad; 206 } 207 tmp = macros[macnum].mac_name; 208 *tmp++ = c; 209 for (i=0; i < 8 && (c=getc(cfile)) != EOF && 210 !isspace(c); ++i) { 211 *tmp++ = c; 212 } 213 if (c == EOF) { 214 puts( 215 "Macro definition missing null line terminator."); 216 goto bad; 217 } 218 *tmp = '\0'; 219 if (c != '\n') { 220 while ((c=getc(cfile)) != EOF && c != '\n'); 221 } 222 if (c == EOF) { 223 puts( 224 "Macro definition missing null line terminator."); 225 goto bad; 226 } 227 if (macnum == 0) { 228 macros[macnum].mac_start = macbuf; 229 } 230 else { 231 macros[macnum].mac_start = 232 macros[macnum-1].mac_end + 1; 233 } 234 tmp = macros[macnum].mac_start; 235 while (tmp != macbuf + 4096) { 236 if ((c=getc(cfile)) == EOF) { 237 puts( 238 "Macro definition missing null line terminator."); 239 goto bad; 240 } 241 *tmp = c; 242 if (*tmp == '\n') { 243 if (*(tmp-1) == '\0') { 244 macros[macnum++].mac_end = tmp - 1; 245 break; 246 } 247 *tmp = '\0'; 248 } 249 tmp++; 250 } 251 if (tmp == macbuf + 4096) { 252 puts("4K macro buffer exceeded."); 253 goto bad; 254 } 255 break; 256 default: 257 warnx("Unknown .netrc keyword %s", tokval); 258 break; 259 } 260 goto done; 261 } 262 done: 263 (void)fclose(cfile); 264 return (0); 265 bad: 266 (void)fclose(cfile); 267 return (-1); 268 } 269 270 static int 271 token() 272 { 273 char *cp; 274 int c; 275 struct toktab *t; 276 277 if (feof(cfile) || ferror(cfile)) 278 return (0); 279 while ((c = getc(cfile)) != EOF && 280 (c == '\n' || c == '\t' || c == ' ' || c == ',')) 281 continue; 282 if (c == EOF) 283 return (0); 284 cp = tokval; 285 if (c == '"') { 286 while ((c = getc(cfile)) != EOF && c != '"') { 287 if (c == '\\') 288 c = getc(cfile); 289 *cp++ = c; 290 } 291 } else { 292 *cp++ = c; 293 while ((c = getc(cfile)) != EOF 294 && c != '\n' && c != '\t' && c != ' ' && c != ',') { 295 if (c == '\\') 296 c = getc(cfile); 297 *cp++ = c; 298 } 299 } 300 *cp = 0; 301 if (tokval[0] == 0) 302 return (0); 303 for (t = toktab; t->tokstr; t++) 304 if (!strcmp(t->tokstr, tokval)) 305 return (t->tval); 306 return (ID); 307 } 308
Indexes created Mon Oct 13 16:09:52 GMT 2025