src/API_Linux.cpp

   1 /*
   2     suPHP - (c)2002-2008 Sebastian Marsching <sebastian@marsching.com>
   3
   4     This file is part of suPHP.
   5
   6     suPHP is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     suPHP is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with suPHP; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #include <string>
  22 #include <iostream>
  23
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <pwd.h>
  29 #include <grp.h>
  30 #include <string.h>
  31 #include <errno.h>
  32
  33 #include "Environment.hpp"
  34 #include "UserInfo.hpp"
  35 #include "GroupInfo.hpp"
  36 #include "API_Linux_Logger.hpp"
  37 #include "Util.hpp"
  38
  39 #include "API_Linux.hpp"
  40
  41 extern char **environ;
  42
  43 using namespace suPHP;
  44
  45 SmartPtr<API_Linux_Logger> suPHP::API_Linux::logger;
  46
  47 bool suPHP::API_Linux::isSymlink(const std::string path) const
  48     throw (SystemException) {
  49     struct stat temp;
  50     if (lstat(path.c_str(), &temp) == -1) {
  51         throw SystemException(std::string("Could not stat \"")
  52                               + path + "\": "
  53                               + ::strerror(errno), __FILE__, __LINE__);
  54     }
  55     if ((temp.st_mode & S_IFLNK) == S_IFLNK) {
  56         return true;
  57     } else {
  58         return false;
  59     }
  60 }
  61 std::string suPHP::API_Linux::readSymlink(const std::string path) const
  62     throw (SystemException) {
  63     char buf[1024] = {0};
  64     if (::readlink(path.c_str(), buf, 1023) == -1) {
  65         throw SystemException(std::string("Could not read symlink \"")
  66                               + path + "\": "
  67                               + ::strerror(errno), __FILE__, __LINE__);
  68     }
  69
  70     if (buf[0] == '/') {
  71         return std::string(buf);
  72     } else {
  73         if (path.rfind('/') == std::string::npos)
  74             return std::string(buf);
  75         return path.substr(0, path.rfind('/') + 1) + std::string(buf);
  76     }
  77 }
  78
  79 Environment suPHP::API_Linux::getProcessEnvironment() {
  80     Environment env;
  81     char **entry = ::environ;
  82     while (*entry != NULL) {
  83         std::string estr = std::string(*entry);
  84         int eqpos = estr.find("=");
  85         std::string name = estr.substr(0, eqpos);
  86         std::string content = estr.substr(eqpos + 1);
  87         env.putVar(name, content);
  88         entry++;
  89     }
  90     return env;
  91 }
  92
  93 UserInfo suPHP::API_Linux::getUserInfo(const std::string username)
  94     throw (LookupException) {
  95     struct passwd *tmpuser = ::getpwnam(username.c_str());
  96     if (tmpuser == NULL) {
  97         throw LookupException(std::string("Could not lookup username \"")
  98                               + username + "\"", __FILE__, __LINE__);
  99     }
 100     return UserInfo(tmpuser->pw_uid);
 101 }
 102
 103 UserInfo suPHP::API_Linux::getUserInfo(const int uid) {
 104     return UserInfo(uid);
 105 }
 106
 107 GroupInfo suPHP::API_Linux::getGroupInfo(const std::string groupname)
 108     throw (LookupException) {
 109     struct group *tmpgroup = ::getgrnam(groupname.c_str());
 110     if (tmpgroup == NULL) {
 111         throw LookupException(std::string("Could not lookup groupname \"")
 112                               + groupname + "\"", __FILE__, __LINE__);
 113     }
 114     return GroupInfo(tmpgroup->gr_gid);
 115 }
 116
 117 GroupInfo suPHP::API_Linux::getGroupInfo(const int gid) {
 118     return GroupInfo(gid);
 119 }
 120
 121 UserInfo suPHP::API_Linux::getEffectiveProcessUser() {
 122     return UserInfo(::geteuid());
 123 }
 124
 125
 126 UserInfo suPHP::API_Linux::getRealProcessUser() {
 127     return UserInfo(getuid());
 128 }
 129
 130
 131 GroupInfo suPHP::API_Linux::getEffectiveProcessGroup() {
 132     return GroupInfo(getegid());
 133 }
 134
 135
 136 GroupInfo suPHP::API_Linux::getRealProcessGroup() {
 137     return GroupInfo(getgid());
 138 }
 139
 140
 141 Logger& suPHP::API_Linux::getSystemLogger() {
 142     if (suPHP::API_Linux::logger.get() == NULL) {
 143         suPHP::API_Linux::logger.reset(new API_Linux_Logger());
 144     }
 145     return *(suPHP::API_Linux::logger);
 146 }
 147
 148
 149 void suPHP::API_Linux::setProcessUser(const UserInfo& user) const
 150     throw (SystemException) {
 151     // Reset supplementary groups
 152     if (::setgroups(0, NULL) == -1) {
 153         throw SystemException(std::string("setgroups() failed: ")
 154                               + ::strerror(errno), __FILE__, __LINE__);
 155     }
 156
 157     try {
 158         if (::initgroups(user.getUsername().c_str(),
 159                          user.getGroupInfo().getGid())
 160             == -1) {
 161             throw SystemException(std::string("initgroups() failed: ")
 162                                   + ::strerror(errno), __FILE__, __LINE__);
 163         }
 164     } catch (LookupException &e) {
 165         // Ignore this exception
 166         // If we have a UID, which does not exist in /etc/passwd
 167         // we simply cannot use supplementary groups
 168     }
 169
 170     if (::setuid(user.getUid()) == -1) {
 171         throw SystemException(std::string("setuid() failed: ")
 172                               + ::strerror(errno), __FILE__, __LINE__);
 173     }
 174 }
 175
 176
 177 void suPHP::API_Linux::setProcessGroup(const GroupInfo& group) const
 178     throw (SystemException) {
 179     if (::setgid(group.getGid()) == -1) {
 180         throw SystemException(std::string("setgid() failed: ")
 181                               + ::strerror(errno), __FILE__, __LINE__);
 182     }
 183 }
 184
 185 std::string suPHP::API_Linux::UserInfo_getUsername(const UserInfo& uinfo) const
 186     throw (LookupException) {
 187     struct passwd *tmpuser = ::getpwuid(uinfo.getUid());
 188     if (tmpuser == NULL) {
 189         throw LookupException(std::string("Could not lookup UID ")
 190                               + Util::intToStr(uinfo.getUid()),
 191                               __FILE__, __LINE__);
 192     }
 193     return std::string(tmpuser->pw_name);
 194 }
 195
 196 GroupInfo suPHP::API_Linux::UserInfo_getGroupInfo(const UserInfo& uinfo) const
 197     throw (LookupException) {
 198     struct passwd *tmpuser = NULL;
 199     tmpuser = getpwuid(uinfo.getUid());
 200     if (tmpuser == NULL) {
 201         throw LookupException(std::string("Could not lookup UID ")
 202                               + Util::intToStr(uinfo.getUid()),
 203                               __FILE__, __LINE__);
 204     }
 205     return GroupInfo(tmpuser->pw_gid);
 206 }
 207
 208 std::string suPHP::API_Linux::UserInfo_getHomeDirectory(const UserInfo& uinfo) const
 209     throw (LookupException) {
 210     struct passwd *tmpuser = NULL;
 211     tmpuser = getpwuid(uinfo.getUid());
 212     if (tmpuser == NULL) {
 213         throw LookupException(std::string("Could not lookup UID ")
 214                               + Util::intToStr(uinfo.getUid()),
 215                               __FILE__, __LINE__);
 216     }
 217     return tmpuser->pw_dir;
 218 }
 219
 220 bool suPHP::API_Linux::UserInfo_isSuperUser(const UserInfo& uinfo) const {
 221     if (uinfo.getUid() == 0)
 222         return true;
 223     else
 224         return false;
 225 }
 226
 227 std::string suPHP::API_Linux::GroupInfo_getGroupname(const GroupInfo& ginfo)
 228     const throw (LookupException) {
 229     struct group *tmpgroup = ::getgrgid(ginfo.getGid());
 230     if (tmpgroup == NULL) {
 231         throw LookupException(std::string("Could not lookup GID ")
 232                                + Util::intToStr(ginfo.getGid()),
 233                               __FILE__, __LINE__);
 234     }
 235     return std::string(tmpgroup->gr_name);
 236 }
 237
 238 bool suPHP::API_Linux::File_exists(const File& file) const {
 239     struct stat dummy;
 240     if (::lstat(file.getPath().c_str(), &dummy) == 0)
 241         return true;
 242     else
 243         return false;
 244 }
 245
 246 std::string suPHP::API_Linux::File_getRealPath(const File& file) const
 247     throw (SystemException) {
 248     std::string currentpath = file.getPath();
 249     std::string resolvedpath = "";
 250     bool failed = true;
 251
 252     if ((currentpath.size() == 0) || (currentpath.at(0) != '/')) {
 253         currentpath = this->getCwd() + std::string("/") + currentpath;
 254     }
 255
 256     // Limit iterations to avoid infinite symlink loops
 257     for (int i=0; i<512; i++) {
 258         // If nothing is left, we have finished
 259         if (currentpath.size() == 0) {
 260             resolvedpath = ("/" + resolvedpath);
 261             failed = false;
 262             break;
 263         }
 264
 265         if (this->isSymlink(currentpath)) {
 266             currentpath = this->readSymlink(currentpath);
 267         } else {
 268             // We know last part is not a symlink, so it is resolved
 269             std::string part1 =
 270                 currentpath.substr(0, currentpath.rfind('/'));
 271             std::string part2 =
 272                 currentpath.substr(currentpath.rfind('/')+1);
 273             currentpath = part1;
 274             if (resolvedpath.size() == 0)
 275                 resolvedpath = part2;
 276             else
 277                 resolvedpath = part2 + "/" + resolvedpath;
 278         }
 279     }
 280
 281     if (failed) {
 282         throw SystemException("Could not resolve path \"" +
 283                               file.getPath() + "\"", __FILE__, __LINE__);
 284     }
 285
 286     while (resolvedpath.find("/./") != std::string::npos) {
 287         int pos = resolvedpath.find("/./");
 288         resolvedpath = resolvedpath.substr(0, pos)
 289             + resolvedpath.substr(pos + 2);
 290     }
 291
 292     while (resolvedpath.find("/../") != std::string::npos) {
 293         int pos = resolvedpath.find("/../");
 294         int pos2 = resolvedpath.rfind('/', pos-1);
 295         resolvedpath = resolvedpath.substr(0, pos2)
 296             + resolvedpath.substr(pos + 3);
 297     }
 298
 299     if (resolvedpath.find("/..", resolvedpath.size() - 3)
 300         != std::string::npos) {
 301         resolvedpath = resolvedpath.substr(0, resolvedpath.size() - 3);
 302         resolvedpath = resolvedpath.substr(0, resolvedpath.rfind('/'));
 303     }
 304
 305     if (resolvedpath.find("/.", resolvedpath.size() - 2)
 306         != std::string::npos) {
 307         resolvedpath = resolvedpath.substr(0, resolvedpath.size() - 2);
 308     }
 309
 310     if (resolvedpath.size() == 0)
 311         resolvedpath = "/";
 312
 313     return resolvedpath;
 314 }
 315
 316 bool suPHP::API_Linux::File_hasPermissionBit(const File& file, FileMode perm)
 317     const throw (SystemException) {
 318     struct stat temp;
 319     if (lstat(file.getPath().c_str(), &temp) == -1) {
 320         throw SystemException(std::string("Could not stat \"")
 321                               + file.getPath() + "\": "
 322                               + ::strerror(errno), __FILE__, __LINE__);
 323     }
 324     switch (perm) {
 325     case FILEMODE_USER_READ:
 326         if ((temp.st_mode & S_IRUSR) == S_IRUSR)
 327             return true;
 328         break;
 329
 330     case FILEMODE_USER_WRITE:
 331         if ((temp.st_mode & S_IWUSR) == S_IWUSR)
 332             return true;
 333         break;
 334
 335     case FILEMODE_USER_EXEC:
 336         if ((temp.st_mode & S_IXUSR) == S_IXUSR)
 337             return true;
 338         break;
 339
 340     case FILEMODE_GROUP_READ:
 341         if ((temp.st_mode & S_IRGRP) == S_IRGRP)
 342             return true;
 343         break;
 344
 345     case FILEMODE_GROUP_WRITE:
 346         if ((temp.st_mode & S_IWGRP) == S_IWGRP)
 347             return true;
 348         break;
 349
 350     case FILEMODE_GROUP_EXEC:
 351         if ((temp.st_mode & S_IXGRP) == S_IXGRP)
 352             return true;
 353         break;
 354
 355     case FILEMODE_OTHERS_READ:
 356         if ((temp.st_mode & S_IROTH) == S_IROTH)
 357             return true;
 358         break;
 359
 360     case FILEMODE_OTHERS_WRITE:
 361         if ((temp.st_mode & S_IWOTH) == S_IWOTH)
 362             return true;
 363         break;
 364
 365     case FILEMODE_OTHERS_EXEC:
 366         if ((temp.st_mode & S_IXOTH) == S_IXOTH)
 367             return true;
 368         break;
 369     }
 370
 371     return false;
 372 }
 373
 374 UserInfo suPHP::API_Linux::File_getUser(const File& file) const
 375     throw (SystemException) {
 376     struct stat temp;
 377     if (lstat(file.getPath().c_str(), &temp) == -1) {
 378         throw SystemException(std::string("Could not stat \"")
 379                               + file.getPath() + "\": "
 380                               + ::strerror(errno), __FILE__, __LINE__);
 381     }
 382     return UserInfo(temp.st_uid);
 383 }
 384
 385 GroupInfo suPHP::API_Linux::File_getGroup(const File& file) const
 386     throw (SystemException) {
 387     struct stat temp;
 388     if (lstat(file.getPath().c_str(), &temp) == -1) {
 389         throw SystemException(std::string("Could not stat \"")
 390                               + file.getPath() + "\": "
 391                               + ::strerror(errno), __FILE__, __LINE__);
 392     }
 393     return GroupInfo(temp.st_gid);
 394 }
 395
 396
 397 bool suPHP::API_Linux::File_isSymlink(const File& file) const throw (SystemException) {
 398     return this->isSymlink(file.getPath());
 399 }
 400
 401
 402 void suPHP::API_Linux::execute(std::string program, const CommandLine& cline,
 403                                const Environment& env) const
 404     throw (SystemException) {
 405     char **sysCline = NULL;
 406     char **sysEnv = NULL;
 407     char **p = NULL;
 408     char *sysProgram = NULL;
 409     std::map<std::string, std::string> map;
 410     int i;
 411
 412
 413
 414     // Construct commandline
 415     sysCline = new char*[cline.size() + 1];
 416     for (i=0; i<cline.size(); i++) {
 417         std::string arg = cline.getArgument(i);
 418         sysCline[i] = new char[arg.size()+1];
 419         ::strncpy(sysCline[i], arg.c_str(), arg.size()+1);
 420     }
 421     sysCline[cline.size()] = NULL;
 422
 423     // Construct environment
 424     map = env.getBackendMap();
 425     sysEnv = new char*[map.size() + 1];
 426     p = sysEnv;
 427     for (std::map<std::string, std::string>::iterator pos = map.begin();
 428          pos != map.end();
 429          pos++) {
 430         std::string var;
 431         var = pos->first + "=" + pos->second;
 432         *p = new char[var.size()+1];
 433         ::strncpy(*p, var.c_str(), var.size()+1);
 434         p++;
 435     }
 436     *p = NULL;
 437
 438     // Make sure target program name is on heap
 439     sysProgram = new char[program.size() + 1];
 440     ::strncpy(sysProgram, program.c_str(), program.size()+1);
 441     if (execve(sysProgram, sysCline, sysEnv) == -1) {
 442         throw SystemException("execve() for program \"" + program
 443                               + "\" failed: " + ::strerror(errno),
 444                               __FILE__, __LINE__);
 445     }
 446
 447     // We are still here? This cannot be good..
 448     throw SystemException("execve() for program \"" + program
 449                           + "\" failed because of unknown reason",
 450                           __FILE__, __LINE__);
 451 }
 452
 453 std::string suPHP::API_Linux::getCwd() const throw (SystemException) {
 454     char buf[4096] = {0};
 455     if (::getcwd(buf, 4095) == NULL)
 456         throw SystemException(std::string("getcwd() failed: ")
 457                               + ::strerror(errno), __FILE__, __LINE__);
 458     return std::string(buf);
 459 }
 460
 461 void suPHP::API_Linux::setCwd(const std::string& dir) const
 462     throw (SystemException) {
 463     if(::chdir(dir.c_str())) {
 464         throw SystemException(std::string("chdir() failed: ")
 465                               + ::strerror(errno), __FILE__, __LINE__);
 466     }
 467 }
 468
 469 void suPHP::API_Linux::setUmask(int mode) const throw (SystemException) {
 470     ::umask(mode);
 471 }
 472
 473 void suPHP::API_Linux::chroot(const std::string& dir) const
 474     throw (SystemException) {
 475     if (::chroot(dir.c_str())) {
 476         throw SystemException(std::string("chroot() failed: ")
 477                               + ::strerror(errno), __FILE__, __LINE__);
 478     }
 479 }