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-rw-r--r--apt-pkg/contrib/fileutl.cc18
-rw-r--r--apt-pkg/contrib/fileutl.h4
2 files changed, 22 insertions, 0 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 29450ada0..6b8f04dea 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -47,6 +47,7 @@
#include <signal.h>
#include <errno.h>
#include <glob.h>
+#include <pwd.h>
#include <set>
#include <algorithm>
@@ -2166,3 +2167,20 @@ bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode)
return true;
}
+
+bool DropPrivs()
+{
+ if (getuid() != 0)
+ return true;
+
+ const std::string nobody = _config->Find("APT::User::Nobody", "nobody");
+ struct passwd *pw = getpwnam(nobody.c_str());
+ if (pw == NULL)
+ return _error->Warning("No user %s, can not drop rights", nobody.c_str());
+ if (setgid(pw->pw_gid) != 0)
+ return _error->Errno("setgid", "Failed to setgid");
+ if (setuid(pw->pw_uid) != 0)
+ return _error->Errno("setuid", "Failed to setuid");
+
+ return true;
+}
diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index 0b4d94885..e04f75e2a 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -193,9 +193,13 @@ pid_t ExecFork(std::set<int> keep_fds);
void MergeKeepFdsFromConfiguration(std::set<int> &keep_fds);
bool ExecWait(pid_t Pid,const char *Name,bool Reap = false);
+
// check if the given file starts with a PGP cleartext signature
bool StartsWithGPGClearTextSignature(std::string const &FileName);
+// process releated
+bool DropPrivs();
+
// File string manipulators
std::string flNotDir(std::string File);
std::string flNotFile(std::string File);