external/bsd/atf/dist/tools/user.cpp

   1 //
   2 // Automated Testing Framework (atf)
   3 //
   4 // Copyright (c) 2007 The NetBSD Foundation, Inc.
   5 // All rights reserved.
   6 //
   7 // Redistribution and use in source and binary forms, with or without
   8 // modification, are permitted provided that the following conditions
   9 // are met:
  10 // 1. Redistributions of source code must retain the above copyright
  11 //    notice, this list of conditions and the following disclaimer.
  12 // 2. Redistributions in binary form must reproduce the above copyright
  13 //    notice, this list of conditions and the following disclaimer in the
  14 //    documentation and/or other materials provided with the distribution.
  15 //
  16 // THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17 // CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20 // IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23 // GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25 // IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27 // IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  29
  30 extern "C" {
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33
  34 #include <limits.h>
  35 #include <pwd.h>
  36 #include <unistd.h>
  37 }
  38
  39 #include <cassert>
  40 #include <stdexcept>
  41 #include <string>
  42
  43 #include "user.hpp"
  44
  45 namespace impl = tools::user;
  46 #define IMPL_NAME "tools::user"
  47
  48 uid_t
  49 impl::euid(void)
  50 {
  51     return ::geteuid();
  52 }
  53
  54 void
  55 impl::drop_privileges(const std::pair< int, int > ids)
  56 {
  57     if (::setgid(ids.second) == -1)
  58         throw std::runtime_error("Failed to drop group privileges");
  59     if (::setuid(ids.first) == -1)
  60         throw std::runtime_error("Failed to drop user privileges");
  61 }
  62
  63 std::pair< int, int >
  64 impl::get_user_ids(const std::string& user)
  65 {
  66     const struct passwd* pw = ::getpwnam(user.c_str());
  67     if (pw == NULL)
  68         throw std::runtime_error("Failed to get information for user " + user);
  69     return std::make_pair(pw->pw_uid, pw->pw_gid);
  70 }
  71
  72 bool
  73 impl::is_member_of_group(gid_t gid)
  74 {
  75     static gid_t groups[NGROUPS_MAX];
  76     static int ngroups = -1;
  77     bool found;
  78     int i;
  79
  80     if (ngroups == -1) {
  81         ngroups = getgroups(NGROUPS_MAX, groups);
  82         assert(ngroups >= 0);
  83     }
  84
  85     found = false;
  86     for (i = 0; !found && i < ngroups; i++)
  87         if (groups[i] == gid)
  88             found = true;
  89     return found;
  90 }
  91
  92 bool
  93 impl::is_root(void)
  94 {
  95     return ::geteuid() == 0;
  96 }
  97
  98 bool
  99 impl::is_unprivileged(void)
 100 {
 101     return ::geteuid() != 0;
 102 }