return false;
} 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 _error->WarningE(Function,_("Problem unlinking the file %s"), FileName.c_str());
+ }
return true;
}
/*}}}*/
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);
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());
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)
{
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;
}
/*}}}*/
-APT_DEPRECATED gzFile FileFd::gzFd() {
+gzFile FileFd::gzFd() {
#ifdef HAVE_ZLIB
return d->gz;
#else
// 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;
+ // a lot can go wrong trying to drop privileges completely,
+ // so ideally we would like to verify that we have done it –
+ // but the verify asks for too much in case of fakeroot (and alike)
+ // [Specific checks can be overridden with dedicated options]
+ bool const VerifySandboxing = _config->FindB("APT::Sandbox::Verify", false);
+
// uid will be 0 in the end, but gid might be different anyway
uid_t const old_uid = getuid();
gid_t const old_gid = getgid();
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 gid, egid, uid, and euid changed
- if (getgid() != pw->pw_gid)
- return _error->Error("Could not switch group");
- if (getegid() != pw->pw_gid)
- return _error->Error("Could not switch effective group");
- if (getuid() != pw->pw_uid)
- return _error->Error("Could not switch user");
- if (geteuid() != pw->pw_uid)
- return _error->Error("Could not switch effective user");
+ // disabled by default as fakeroot doesn't implement getgroups currently (#806521)
+ if (VerifySandboxing == true || _config->FindB("APT::Sandbox::Verify::Groups", false) == true)
+ {
+ // 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]);
+ }
+
+ // enabled by default as all fakeroot-lookalikes should fake that accordingly
+ if (VerifySandboxing == true || _config->FindB("APT::Sandbox::Verify::IDs", true) == true)
+ {
+ // Verify that gid, egid, uid, and euid changed
+ if (getgid() != pw->pw_gid)
+ return _error->Error("Could not switch group");
+ if (getegid() != pw->pw_gid)
+ return _error->Error("Could not switch effective group");
+ if (getuid() != pw->pw_uid)
+ return _error->Error("Could not switch user");
+ if (geteuid() != pw->pw_uid)
+ return _error->Error("Could not switch effective user");
#ifdef HAVE_GETRESUID
- // verify that the saved set-user-id was changed as well
- uid_t ruid = 0;
- uid_t euid = 0;
- uid_t suid = 0;
- if (getresuid(&ruid, &euid, &suid))
- return _error->Errno("getresuid", "Could not get saved set-user-ID");
- if (suid != pw->pw_uid)
- return _error->Error("Could not switch saved set-user-ID");
+ // verify that the saved set-user-id was changed as well
+ uid_t ruid = 0;
+ uid_t euid = 0;
+ uid_t suid = 0;
+ if (getresuid(&ruid, &euid, &suid))
+ return _error->Errno("getresuid", "Could not get saved set-user-ID");
+ if (suid != pw->pw_uid)
+ return _error->Error("Could not switch saved set-user-ID");
#endif
#ifdef HAVE_GETRESGID
- // verify that the saved set-group-id was changed as well
- gid_t rgid = 0;
- gid_t egid = 0;
- gid_t sgid = 0;
- if (getresgid(&rgid, &egid, &sgid))
- return _error->Errno("getresuid", "Could not get saved set-group-ID");
- if (sgid != pw->pw_gid)
- return _error->Error("Could not switch saved set-group-ID");
+ // verify that the saved set-group-id was changed as well
+ gid_t rgid = 0;
+ gid_t egid = 0;
+ gid_t sgid = 0;
+ if (getresgid(&rgid, &egid, &sgid))
+ return _error->Errno("getresuid", "Could not get saved set-group-ID");
+ if (sgid != pw->pw_gid)
+ return _error->Error("Could not switch saved set-group-ID");
#endif
+ }
- // Check that uid and gid changes do not work anymore
- if (pw->pw_gid != old_gid && (setgid(old_gid) != -1 || setegid(old_gid) != -1))
- return _error->Error("Could restore a gid to root, privilege dropping did not work");
+ // disabled as fakeroot doesn't forbid (by design) (re)gaining root from unprivileged
+ if (VerifySandboxing == true || _config->FindB("APT::Sandbox::Verify::Regain", false) == true)
+ {
+ // Check that uid and gid changes do not work anymore
+ if (pw->pw_gid != old_gid && (setgid(old_gid) != -1 || setegid(old_gid) != -1))
+ return _error->Error("Could restore a gid to root, privilege dropping did not work");
- if (pw->pw_uid != old_uid && (setuid(old_uid) != -1 || seteuid(old_uid) != -1))
- return _error->Error("Could restore a uid to root, privilege dropping did not work");
+ if (pw->pw_uid != old_uid && (setuid(old_uid) != -1 || seteuid(old_uid) != -1))
+ return _error->Error("Could restore a uid to root, privilege dropping did not work");
+ }
return true;
}
projects / apt.git / blobdiff