show the group we failed to drop via setgroups

[apt.git] / apt-pkg / contrib / fileutl.cc

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 837edef4b1e015a075549c5cccbc672c7c3149c3..f754b313e500c187e58706d809bd9527a00dd383 100644 (file)
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -158,24 +158,33 @@ bool CopyFile(FileFd &From,FileFd &To)
    if (From.IsOpen() == false || To.IsOpen() == false ||
         From.Failed() == true || To.Failed() == true)
       return false;
-   
+
    // Buffered copy between fds
    std::unique_ptr<unsigned char[]> Buf(new unsigned char[64000]);
-   unsigned long long Size = From.Size();
-   while (Size != 0)
-   {
-      unsigned long long ToRead = Size;
-      if (Size > 64000)
-        ToRead = 64000;
-      
-      if (From.Read(Buf.get(),ToRead) == false ||
+   constexpr unsigned long long BufSize = sizeof(Buf.get())/sizeof(Buf.get()[0]);
+   unsigned long long ToRead = 0;
+   do {
+      if (From.Read(Buf.get(),BufSize, &ToRead) == false ||
          To.Write(Buf.get(),ToRead) == false)
         return false;
-      
-      Size -= ToRead;
-   }
+   } while (ToRead != 0);
+
+   return true;
+}
+                                                                       /*}}}*/
+bool RemoveFile(char const * const Function, std::string const &FileName)/*{{{*/
+{
+   if (FileName == "/dev/null")
+      return true;
+   errno = 0;
+   if (unlink(FileName.c_str()) != 0)
+   {
+      if (errno == ENOENT)
+        return true;
 
-   return true;   
+      return _error->WarningE(Function,_("Problem unlinking the file %s"), FileName.c_str());
+   }
+   return true;
 }
                                                                        /*}}}*/
 // GetLock - Gets a lock file                                          /*{{{*/
@@ -671,7 +680,7 @@ string flAbsPath(string File)
    char *p = realpath(File.c_str(), NULL);
    if (p == NULL)
    {
-      _error->Errno("realpath", "flAbsPath failed");
+      _error->Errno("realpath", "flAbsPath on %s failed", File.c_str());
       return "";
    }
    std::string AbsPath(p);
@@ -1130,24 +1139,28 @@ bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Co
    if ((Mode & ReadWrite) == 0)
       return FileFdError("No openmode provided in FileFd::Open for %s", FileName.c_str());
 
-   if ((Mode & Atomic) == Atomic)
+   unsigned int OpenMode = Mode;
+   if (FileName == "/dev/null")
+      OpenMode = OpenMode & ~(Atomic | Exclusive | Create | Empty);
+
+   if ((OpenMode & Atomic) == Atomic)
    {
       Flags |= Replace;
    }
-   else if ((Mode & (Exclusive | Create)) == (Exclusive | Create))
+   else if ((OpenMode & (Exclusive | Create)) == (Exclusive | Create))
    {
       // for atomic, this will be done by rename in Close()
-      unlink(FileName.c_str());
+      RemoveFile("FileFd::Open", FileName);
    }
-   if ((Mode & Empty) == Empty)
+   if ((OpenMode & Empty) == Empty)
    {
       struct stat Buf;
       if (lstat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
-        unlink(FileName.c_str());
+        RemoveFile("FileFd::Open", FileName);
    }
 
    int fileflags = 0;
-   #define if_FLAGGED_SET(FLAG, MODE) if ((Mode & FLAG) == FLAG) fileflags |= MODE
+   #define if_FLAGGED_SET(FLAG, MODE) if ((OpenMode & FLAG) == FLAG) fileflags |= MODE
    if_FLAGGED_SET(ReadWrite, O_RDWR);
    else if_FLAGGED_SET(ReadOnly, O_RDONLY);
    else if_FLAGGED_SET(WriteOnly, O_WRONLY);
@@ -1157,7 +1170,7 @@ bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Co
    if_FLAGGED_SET(Exclusive, O_EXCL);
    #undef if_FLAGGED_SET
 
-   if ((Mode & Atomic) == Atomic)
+   if ((OpenMode & Atomic) == Atomic)
    {
       char *name = strdup((FileName + ".XXXXXX").c_str());
 
@@ -1184,7 +1197,7 @@ bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Co
       iFd = open(FileName.c_str(), fileflags, AccessMode);
 
    this->FileName = FileName;
-   if (iFd == -1 || OpenInternDescriptor(Mode, compressor) == false)
+   if (iFd == -1 || OpenInternDescriptor(OpenMode, compressor) == false)
    {
       if (iFd != -1)
       {
@@ -2027,8 +2040,7 @@ bool FileFd::Close()
 
    if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
        FileName.empty() == false)
-      if (unlink(FileName.c_str()) != 0)
-        Res &= _error->WarningE("unlnk",_("Problem unlinking the file %s"), FileName.c_str());
+      Res &= RemoveFile("FileFd::Close", FileName);
 
    if (Res == false)
       Flags |= Fail;
@@ -2078,7 +2090,7 @@ bool FileFd::FileFdError(const char *Description,...) {
 }
                                                                        /*}}}*/
 
-APT_DEPRECATED gzFile FileFd::gzFd() {
+gzFile FileFd::gzFd() {
 #ifdef HAVE_ZLIB
    return d->gz;
 #else
@@ -2236,11 +2248,14 @@ bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode)/
    {
       close(Pipe[1]);
       fd = Pipe[0];
-   } else if(Mode == FileFd::WriteOnly)
+   }
+   else if(Mode == FileFd::WriteOnly)
    {
       close(Pipe[0]);
       fd = Pipe[1];
    }
+   else
+      return _error->Error("Popen supports ReadOnly (x)or WriteOnly mode only");
    Fd.OpenDescriptor(fd, Mode, FileFd::None, true);
 
    return true;
@@ -2265,7 +2280,7 @@ bool DropPrivileges()                                                     /*{{{*/
    // empty setting disables privilege dropping - this also ensures
    // backward compatibility, see bug #764506
    const std::string toUser = _config->Find("APT::Sandbox::User");
-   if (toUser.empty())
+   if (toUser.empty() || toUser == "root")
       return true;
 
    // uid will be 0 in the end, but gid might be different anyway
@@ -2307,12 +2322,17 @@ bool DropPrivileges()                                                   /*{{{*/
       return _error->Errno("seteuid", "Failed to seteuid");
 #endif
 
-   // Verify that the user has only a single group, and the correct one
-   gid_t groups[1];
-   if (getgroups(1, groups) != 1)
-      return _error->Errno("getgroups", "Could not get new groups");
-   if (groups[0] != pw->pw_gid)
-      return _error->Error("Could not switch group");
+   // Verify that the user isn't still in any supplementary groups
+   long const ngroups_max = sysconf(_SC_NGROUPS_MAX);
+   std::unique_ptr<gid_t[]> gidlist(new gid_t[ngroups_max]);
+   if (unlikely(gidlist == NULL))
+      return _error->Error("Allocation of a list of size %lu for getgroups failed", ngroups_max);
+   ssize_t gidlist_nr;
+   if ((gidlist_nr = getgroups(ngroups_max, gidlist.get())) < 0)
+      return _error->Errno("getgroups", "Could not get new groups (%lu)", ngroups_max);
+   for (ssize_t i = 0; i < gidlist_nr; ++i)
+      if (gidlist[i] != pw->pw_gid)
+        return _error->Error("Could not switch group, user %s is still in group %d", toUser.c_str(), gidlist[i]);
 
    // Verify that gid, egid, uid, and euid changed
    if (getgid() != pw->pw_gid)