apt-pkg/contrib/netrc.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: netrc.c,v 1.38 2007-11-07 09:21:35 bagder Exp $
   4 /* ######################################################################
   5
   6    netrc file parser - returns the login and password of a give host in
   7                        a specified netrc-type file
   8
   9    Originally written by Daniel Stenberg, <daniel@haxx.se>, et al. and
  10    placed into the Public Domain, do with it what you will.
  11
  12    ##################################################################### */
  13                                                                         /*}}}*/
  14 #include <config.h>
  15
  16 #include <apt-pkg/configuration.h>
  17 #include <apt-pkg/strutl.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/fileutl.h>
  20
  21 #include <iostream>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <pwd.h>
  27
  28 #include "netrc.h"
  29
  30 using std::string;
  31
  32 /* Get user and password from .netrc when given a machine name */
  33
  34 enum {
  35   NOTHING,
  36   HOSTFOUND,    /* the 'machine' keyword was found */
  37   HOSTCOMPLETE, /* the machine name following the keyword was found too */
  38   HOSTVALID,    /* this is "our" machine! */
  39   HOSTEND /* LAST enum */
  40 };
  41
  42 /* make sure we have room for at least this size: */
  43 #define LOGINSIZE 256
  44 #define PASSWORDSIZE 256
  45 #define NETRC DOT_CHAR "netrc"
  46
  47 /* returns -1 on failure, 0 if the host is found, 1 is the host isn't found */
  48 static int parsenetrc_string (char *host, std::string &login, std::string &password, char *netrcfile = NULL)
  49 {
  50   FILE *file;
  51   int retcode = 1;
  52   int specific_login = (login.empty() == false);
  53   bool netrc_alloc = false;
  54
  55   if (!netrcfile) {
  56     char const * home = getenv ("HOME"); /* portable environment reader */
  57
  58     if (!home) {
  59       struct passwd *pw;
  60       pw = getpwuid (geteuid ());
  61       if(pw)
  62         home = pw->pw_dir;
  63     }
  64
  65     if (!home)
  66       return -1;
  67
  68     if (asprintf (&netrcfile, "%s%s%s", home, DIR_CHAR, NETRC) == -1 || netrcfile == NULL)
  69       return -1;
  70     else
  71       netrc_alloc = true;
  72   }
  73
  74   file = fopen (netrcfile, "r");
  75   if(file) {
  76     char *tok;
  77     char *tok_buf;
  78     bool done = false;
  79     char *netrcbuffer = NULL;
  80     size_t netrcbuffer_size = 0;
  81
  82     int state = NOTHING;
  83     char state_login = 0;        /* Found a login keyword */
  84     char state_password = 0;     /* Found a password keyword */
  85     int state_our_login = false;  /* With specific_login,
  86                                      found *our* login name */
  87
  88     while (!done && getline(&netrcbuffer, &netrcbuffer_size, file) != -1) {
  89       tok = strtok_r (netrcbuffer, " \t\n", &tok_buf);
  90       while (!done && tok) {
  91         if(login.empty() == false && password.empty() == false) {
  92           done = true;
  93           break;
  94         }
  95
  96         switch(state) {
  97         case NOTHING:
  98           if (!strcasecmp ("machine", tok)) {
  99             /* the next tok is the machine name, this is in itself the
 100                delimiter that starts the stuff entered for this machine,
 101                after this we need to search for 'login' and
 102                'password'. */
 103             state = HOSTFOUND;
 104           }
 105           break;
 106         case HOSTFOUND:
 107            /* extended definition of a "machine" if we have a "/"
 108               we match the start of the string (host.startswith(token) */
 109           if ((strchr(host, '/') && strstr(host, tok) == host) ||
 110               (!strcasecmp (host, tok))) {
 111             /* and yes, this is our host! */
 112             state = HOSTVALID;
 113             retcode = 0; /* we did find our host */
 114           }
 115           else
 116             /* not our host */
 117             state = NOTHING;
 118           break;
 119         case HOSTVALID:
 120           /* we are now parsing sub-keywords concerning "our" host */
 121           if (state_login) {
 122             if (specific_login)
 123               state_our_login = !strcasecmp (login.c_str(), tok);
 124             else
 125               login = tok;
 126             state_login = 0;
 127           } else if (state_password) {
 128             if (state_our_login || !specific_login)
 129               password = tok;
 130             state_password = 0;
 131           } else if (!strcasecmp ("login", tok))
 132             state_login = 1;
 133           else if (!strcasecmp ("password", tok))
 134             state_password = 1;
 135           else if(!strcasecmp ("machine", tok)) {
 136             /* ok, there's machine here go => */
 137             state = HOSTFOUND;
 138             state_our_login = false;
 139           }
 140           break;
 141         } /* switch (state) */
 142
 143         tok = strtok_r (NULL, " \t\n", &tok_buf);
 144       } /* while(tok) */
 145     } /* while getline() */
 146
 147     free(netrcbuffer);
 148     fclose(file);
 149   }
 150
 151   if (netrc_alloc)
 152     free(netrcfile);
 153
 154   return retcode;
 155 }
 156 // for some unknown reason this method is exported so keep a compatible interface for now …
 157 int parsenetrc (char *host, char *login, char *password, char *netrcfile = NULL)
 158 {
 159    std::string login_string, password_string;
 160    int const ret = parsenetrc_string(host, login_string, password_string, netrcfile);
 161    if (ret < 0)
 162       return ret;
 163    strncpy(login, login_string.c_str(), LOGINSIZE - 1);
 164    strncpy(password, password_string.c_str(), PASSWORDSIZE - 1);
 165    return ret;
 166 }
 167
 168
 169 void maybe_add_auth (URI &Uri, string NetRCFile)
 170 {
 171   if (_config->FindB("Debug::Acquire::netrc", false) == true)
 172      std::clog << "maybe_add_auth: " << (string)Uri
 173                << " " << NetRCFile << std::endl;
 174   if (Uri.Password.empty () == true || Uri.User.empty () == true)
 175   {
 176     if (NetRCFile.empty () == false)
 177     {
 178        std::string login, password;
 179       char *netrcfile = strdup(NetRCFile.c_str());
 180
 181       // first check for a generic host based netrc entry
 182       char *host = strdup(Uri.Host.c_str());
 183       if (host && parsenetrc_string(host, login, password, netrcfile) == 0)
 184       {
 185          if (_config->FindB("Debug::Acquire::netrc", false) == true)
 186             std::clog << "host: " << host
 187                       << " user: " << login
 188                       << " pass-size: " << password.size()
 189                       << std::endl;
 190         Uri.User = login;
 191         Uri.Password = password;
 192         free(netrcfile);
 193         free(host);
 194         return;
 195       }
 196       free(host);
 197
 198       // if host did not work, try Host+Path next, this will trigger
 199       // a lookup uri.startswith(host) in the netrc file parser (because
 200       // of the "/"
 201       char *hostpath = strdup(string(Uri.Host+Uri.Path).c_str());
 202       if (hostpath && parsenetrc_string(hostpath, login, password, netrcfile) == 0)
 203       {
 204          if (_config->FindB("Debug::Acquire::netrc", false) == true)
 205             std::clog << "hostpath: " << hostpath
 206                       << " user: " << login
 207                       << " pass-size: " << password.size()
 208                       << std::endl;
 209          Uri.User = login;
 210          Uri.Password = password;
 211       }
 212       free(netrcfile);
 213       free(hostpath);
 214     }
 215   }
 216 }
 217
 218 #ifdef DEBUG
 219 int main(int argc, char* argv[])
 220 {
 221   char login[64] = "";
 222   char password[64] = "";
 223
 224   if(argc < 2)
 225     return -1;
 226
 227   if(0 == parsenetrc (argv[1], login, password, argv[2])) {
 228     printf("HOST: %s LOGIN: %s PASSWORD: %s\n", argv[1], login, password);
 229   }
 230 }
 231 #endif