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

   1 /* credentials.c -- wrap configurable access to .netrc or similar files.
   2  *
   3  * This code is Copyright (c) 2013, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9 #include <h/utils.h>
  10 #include <h/mts.h>
  11 #include "m_maildir.h"
  12
  13 struct nmh_creds {
  14     char *host;         /* Hostname corresponding to credentials */
  15     char *user;         /* Username corresponding to credentials */
  16     char *pass;         /* (Optional) password used by credentials */
  17 };
  18
  19 void
  20 init_credentials_file(void) {
  21     if (credentials_file == NULL) {
  22         char *cred_style = context_find ("credentials");
  23
  24         if (cred_style == NULL  ||  ! strcmp (cred_style, "legacy")) {
  25             char *hdir = getenv ("HOME");
  26
  27             credentials_file = concat (hdir ? hdir : ".", "/.netrc", NULL);
  28         } else if (! strncasecmp (cred_style, "file:", 5) ||
  29                    ! strncasecmp (cred_style, "file-nopermcheck:", 17)) {
  30             struct stat st;
  31             char *filename = strchr(cred_style, ':') + 1;
  32
  33             while (isspace((unsigned char)*filename))
  34                 filename++;
  35
  36             if (*filename == '/') {
  37                 credentials_file = filename;
  38             } else {
  39                 credentials_file = m_maildir (filename);
  40                 if (stat (credentials_file, &st) != OK) {
  41                     credentials_file =
  42                         concat (mypath ? mypath : ".", "/", filename, NULL);
  43                     if (stat (credentials_file, &st) != OK) {
  44                         inform("unable to find credentials file %s, continuing...",
  45                                   filename);
  46                     }
  47                 }
  48             }
  49
  50             if (! strncasecmp (cred_style, "file-nopermcheck:", 17))
  51                 credentials_no_perm_check = 1;
  52         }
  53     }
  54 }
  55
  56 nmh_creds_t
  57 nmh_get_credentials (const char *host, const char *user)
  58 {
  59     nmh_creds_t creds;
  60
  61     char *cred_style = context_find ("credentials");
  62
  63     init_credentials_file ();
  64
  65     creds = mh_xmalloc(sizeof(*creds));
  66
  67     creds->host = mh_xstrdup(host);
  68     creds->user = NULL;
  69     creds->pass = NULL;
  70
  71     if (cred_style == NULL  ||  ! strcmp (cred_style, "legacy")) {
  72         creds->user = user == NULL  ?  mh_xstrdup(getusername ())  :  mh_xstrdup(user);
  73     } else if (! strncasecmp (cred_style, "file:", 5) ||
  74                ! strncasecmp (cred_style, "file-nopermcheck:", 17)) {
  75         /*
  76          * Determine user using the first of:
  77          * 1) -user switch
  78          * 2) matching host entry with login in a credentials file
  79          *    such as ~/.netrc
  80          * 3) interactively request from user (as long as the
  81          *    credentials file didn't have a "default" token)
  82          */
  83         creds->user = user == NULL ? NULL : mh_xstrdup(user);
  84     } else {
  85         inform("unknown credentials style %s, continuing...", cred_style);
  86         return NULL;
  87     }
  88
  89     ruserpass(creds->host, &creds->user, &creds->pass,
  90               RUSERPASS_NO_PROMPT_USER | RUSERPASS_NO_PROMPT_PASSWORD);
  91
  92     return creds;
  93 }
  94
  95 /*
  96  * Retrieve the username
  97  */
  98
  99 const char *
 100 nmh_cred_get_user(nmh_creds_t creds)
 101 {
 102     if (! creds->user) {
 103         ruserpass(creds->host, &creds->user, &creds->pass,
 104                   RUSERPASS_NO_PROMPT_PASSWORD);
 105     }
 106
 107     return creds->user;
 108 }
 109
 110 /*
 111  * Retrieve the password
 112  */
 113
 114 const char *
 115 nmh_cred_get_password(nmh_creds_t creds)
 116 {
 117     if (! creds->pass) {
 118         ruserpass(creds->host, &creds->user, &creds->pass, 0);
 119     }
 120
 121     return creds->pass;
 122 }
 123
 124 /*
 125  * Free our credentials
 126  */
 127
 128 void
 129 nmh_credentials_free(nmh_creds_t creds)
 130 {
 131     free(creds->host);
 132     free(creds->user);
 133
 134     if (creds->pass) {
 135         memset(creds->pass, 0, strlen(creds->pass));
 136         free(creds->pass);
 137     }
 138
 139     free(creds);
 140 }