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