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
  19 #include <h/mh.h>
  20 #include <h/utils.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23
  24 static FILE *cfile;
  25
  26 #ifndef MAXHOSTNAMELEN
  27 # define MAXHOSTNAMELEN 64
  28 #endif
  29
  30 #define DEFAULT 1
  31 #define LOGIN   2
  32 #define PASSWD  3
  33 #define ACCOUNT 4
  34 #define MACDEF  5
  35 #define ID      10
  36 #define MACH    11
  37
  38 static char tokval[100];
  39
  40 struct toktab {
  41     char *tokstr;
  42     int tval;
  43 };
  44
  45 static struct toktab toktabs[] = {
  46     { "default",  DEFAULT },
  47     { "login",    LOGIN },
  48     { "password", PASSWD },
  49     { "passwd",   PASSWD },
  50     { "account",  ACCOUNT },
  51     { "machine",  MACH },
  52     { "macdef",   MACDEF },
  53     { 0,          0 }
  54 };
  55
  56 /*
  57  * prototypes
  58  */
  59 static int token(void);
  60
  61
  62 void
  63 ruserpass(char *host, char **aname, char **apass)
  64 {
  65     char *hdir, buf[BUFSIZ];
  66     int t, usedefault = 0;
  67     struct stat stb;
  68
  69     hdir = getenv("HOME");
  70     if (hdir == NULL)
  71         hdir = ".";
  72     snprintf(buf, sizeof(buf), "%s/.netrc", hdir);
  73     cfile = fopen(buf, "r");
  74     if (cfile == NULL) {
  75         if (errno != ENOENT)
  76             perror(buf);
  77         goto done;
  78     }
  79
  80     while ((t = token())) {
  81         switch(t) {
  82         case DEFAULT:
  83             usedefault = 1;
  84             /* FALL THROUGH */
  85
  86         case MACH:
  87             if (!usedefault) {
  88                 if (token() != ID)
  89                     continue;
  90                 /*
  91                  * Allow match either for user's host name.
  92                  */
  93                 if (mh_strcasecmp(host, tokval) == 0)
  94                     goto match;
  95                 continue;
  96             }
  97 match:
  98             while ((t = token()) && t != MACH && t != DEFAULT) {
  99                 switch(t) {
 100                 case LOGIN:
 101                     if (token() && *aname == 0) {
 102                         *aname = mh_xmalloc((size_t) strlen(tokval) + 1);
 103                         strcpy(*aname, tokval);
 104                     }
 105                     break;
 106                 case PASSWD:
 107                     if (fstat(fileno(cfile), &stb) >= 0 &&
 108                         (stb.st_mode & 077) != 0) {
 109                         /* We make this a fatal error to force the user to correct it */
 110                         advise(NULL, "Error - ~/.netrc file must not be world or group readable.");
 111                         adios(NULL, "Remove password or correct file permissions.");
 112                     }
 113                     if (token() && *apass == 0) {
 114                         *apass = mh_xmalloc((size_t) strlen(tokval) + 1);
 115                         strcpy(*apass, tokval);
 116                     }
 117                     break;
 118                 case ACCOUNT:
 119                     break;
 120
 121                 case MACDEF:
 122                     goto done_close;
 123                     break;
 124                 default:
 125                     fprintf(stderr, "Unknown .netrc keyword %s\n", tokval);
 126                     break;
 127                 }
 128             }
 129             goto done;
 130         }
 131     }
 132
 133 done_close:
 134     fclose(cfile);
 135
 136 done:
 137     if (!*aname) {
 138         char tmp[80];
 139         char *myname;
 140
 141         if ((myname = getlogin()) == NULL) {
 142             struct passwd *pp;
 143
 144             if ((pp = getpwuid (getuid())) != NULL)
 145                 myname = pp->pw_name;
 146         }
 147         printf("Name (%s:%s): ", host, myname);
 148
 149         fgets(tmp, sizeof(tmp) - 1, stdin);
 150         tmp[strlen(tmp) - 1] = '\0';
 151         if (*tmp != '\0') {
 152             myname = tmp;
 153         }
 154
 155         *aname = mh_xmalloc((size_t) strlen(myname) + 1);
 156         strcpy (*aname, myname);
 157     }
 158
 159     if (!*apass) {
 160         char prompt[256];
 161         char *mypass;
 162
 163         snprintf(prompt, sizeof(prompt), "Password (%s:%s): ", host, *aname);
 164         mypass = nmh_getpass(prompt);
 165
 166         if (*mypass == '\0') {
 167             mypass = *aname;
 168         }
 169
 170         *apass = mh_xmalloc((size_t) strlen(mypass) + 1);
 171         strcpy (*apass, mypass);
 172     }
 173
 174 }
 175
 176 static int
 177 token(void)
 178 {
 179     char *cp;
 180     int c;
 181     struct toktab *t;
 182
 183     if (feof(cfile))
 184         return (0);
 185     while ((c = getc(cfile)) != EOF &&
 186            (c == '\n' || c == '\t' || c == ' ' || c == ','))
 187         continue;
 188     if (c == EOF)
 189         return (0);
 190     cp = tokval;
 191     if (c == '"') {
 192         while ((c = getc(cfile)) != EOF && c != '"') {
 193             if (c == '\\')
 194                 c = getc(cfile);
 195             *cp++ = c;
 196         }
 197     } else {
 198         *cp++ = c;
 199         while ((c = getc(cfile)) != EOF
 200                && c != '\n' && c != '\t' && c != ' ' && c != ',') {
 201             if (c == '\\')
 202                 c = getc(cfile);
 203             *cp++ = c;
 204         }
 205     }
 206     *cp = 0;
 207     if (tokval[0] == 0)
 208         return (0);
 209     for (t = toktabs; t->tokstr; t++)
 210         if (!strcmp(t->tokstr, tokval))
 211             return (t->tval);
 212     return (ID);
 213 }