diplodocus.org Git - nmh/blob - sbr/ruserpass.c

   1 /*
   2  * Portions of this code are
   3  * Copyright (c) 1985 Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms are permitted
   7  * provided that the above copyright notice and this paragraph are
   8  * duplicated in all such forms and that any documentation,
   9  * advertising materials, and other materials related to such
  10  * distribution and use acknowledge that the software was developed
  11  * by the University of California, Berkeley.  The name of the
  12  * University may not be used to endorse or promote products derived
  13  * from this software without specific prior written permission.
  14  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  17  *
  18  * Portions of this code are Copyright (c) 2013, by the authors of
  19  * nmh.  See the COPYRIGHT file in the root directory of the nmh
  20  * distribution for complete copyright information.
  21  */
  22
  23 #include <h/mh.h>
  24 #include <h/utils.h>
  25 #include <pwd.h>
  26
  27 static FILE *cfile;
  28
  29 #define DEFAULT 1
  30 #define LOGIN   2
  31 #define PASSWD  3
  32 #define ACCOUNT 4
  33 #define MACDEF  5
  34 #define ID      10
  35 #define MACH    11
  36
  37 static char tokval[100];
  38
  39 struct toktab {
  40     char *tokstr;
  41     int tval;
  42 };
  43
  44 static struct toktab toktabs[] = {
  45     { "default",  DEFAULT },
  46     { "login",    LOGIN },
  47     { "password", PASSWD },
  48     { "passwd",   PASSWD },
  49     { "account",  ACCOUNT },
  50     { "machine",  MACH },
  51     { "macdef",   MACDEF },
  52     { 0,          0 }
  53 };
  54
  55 /*
  56  * prototypes
  57  */
  58 static int token(void);
  59
  60
  61 void
  62 ruserpass(char *host, char **aname, char **apass)
  63 {
  64     int t, usedefault = 0;
  65     struct stat stb;
  66
  67     init_credentials_file ();
  68
  69     cfile = fopen (credentials_file, "r");
  70     if (cfile == NULL) {
  71         if (errno != ENOENT)
  72             perror (credentials_file);
  73     } else {
  74         while ((t = token())) {
  75             switch(t) {
  76             case DEFAULT:
  77                 usedefault = 1;
  78                 /* FALL THROUGH */
  79
  80             case MACH:
  81                 if (!usedefault) {
  82                     if (token() != ID)
  83                         continue;
  84                     /*
  85                      * Allow match either for user's host name.
  86                      */
  87                     if (strcasecmp(host, tokval) == 0)
  88                         goto match;
  89                     continue;
  90                 }
  91             match:
  92                 while ((t = token()) && t != MACH && t != DEFAULT) {
  93                     switch(t) {
  94                     case LOGIN:
  95                         if (token() && *aname == 0) {
  96                             *aname = mh_xmalloc((size_t) strlen(tokval) + 1);
  97                             strcpy(*aname, tokval);
  98                         }
  99                         break;
 100
 101                     case PASSWD:
 102                         if (fstat(fileno(cfile), &stb) >= 0 &&
 103                             (stb.st_mode & 077) != 0) {
 104                             /* We make this a fatal error to force the
 105                                user to correct it. */
 106                             advise(NULL, "Error - file %s must not be world or "
 107                                    "group readable.", credentials_file);
 108                             adios(NULL, "Remove password or correct file "
 109                                   "permissions.");
 110                         }
 111                         if (token() && *apass == 0) {
 112                             *apass = mh_xmalloc((size_t) strlen(tokval) + 1);
 113                             strcpy(*apass, tokval);
 114                         }
 115                         break;
 116
 117                     case ACCOUNT:
 118                         break;
 119
 120                     case MACDEF:
 121                         fclose(cfile);
 122                         return;
 123
 124                     default:
 125                         fprintf(stderr,
 126                                 "Unknown keyword %s in credentials file %s\n",
 127                                 tokval, credentials_file);
 128                         break;
 129                     }
 130                 }
 131                 return;
 132             }
 133         }
 134     }
 135
 136     if (!*aname) {
 137         char tmp[80];
 138         char *myname;
 139
 140         if ((myname = getlogin()) == NULL) {
 141             struct passwd *pp;
 142
 143             if ((pp = getpwuid (getuid())) != NULL)
 144                 myname = pp->pw_name;
 145         }
 146         printf("Name (%s:%s): ", host, myname);
 147
 148         fgets(tmp, sizeof(tmp) - 1, stdin);
 149         tmp[strlen(tmp) - 1] = '\0';
 150         if (*tmp != '\0') {
 151             myname = tmp;
 152         }
 153
 154         *aname = mh_xmalloc((size_t) strlen(myname) + 1);
 155         strcpy (*aname, myname);
 156     }
 157
 158     if (!*apass) {
 159         char prompt[256];
 160         char *mypass;
 161
 162         snprintf(prompt, sizeof(prompt), "Password (%s:%s): ", host, *aname);
 163         mypass = nmh_getpass(prompt);
 164
 165         if (*mypass == '\0') {
 166             mypass = *aname;
 167         }
 168
 169         *apass = mh_xmalloc((size_t) strlen(mypass) + 1);
 170         strcpy (*apass, mypass);
 171     }
 172
 173 }
 174
 175 static int
 176 token(void)
 177 {
 178     char *cp;
 179     int c;
 180     struct toktab *t;
 181
 182     if (feof(cfile))
 183         return (0);
 184     while ((c = getc(cfile)) != EOF &&
 185            (c == '\n' || c == '\t' || c == ' ' || c == ','))
 186         continue;
 187     if (c == EOF)
 188         return (0);
 189     cp = tokval;
 190     if (c == '"') {
 191         while ((c = getc(cfile)) != EOF && c != '"') {
 192             if (c == '\\')
 193                 c = getc(cfile);
 194             *cp++ = c;
 195         }
 196     } else {
 197         *cp++ = c;
 198         while ((c = getc(cfile)) != EOF
 199                && c != '\n' && c != '\t' && c != ' ' && c != ',') {
 200             if (c == '\\')
 201                 c = getc(cfile);
 202             *cp++ = c;
 203         }
 204     }
 205     *cp = 0;
 206     if (tokval[0] == 0)
 207         return (0);
 208     for (t = toktabs; t->tokstr; t++)
 209         if (!strcmp(t->tokstr, tokval))
 210             return (t->tval);
 211     return (ID);
 212 }