1 files changed, 89 insertions, 0 deletions
diff --git a/lib/entropy/unix_procs/unix_procs.h b/lib/entropy/unix_procs/unix_procs.h
new file mode 100644
index 000000000..7c1ae8c65
--- /dev/null
+++ b/lib/entropy/unix_procs/unix_procs.h
@@ -0,0 +1,89 @@
+/*
+* Unix EntropySource
+* (C) 1999-2009,2013 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ENTROPY_SRC_UNIX_H__
+#define BOTAN_ENTROPY_SRC_UNIX_H__
+
+#include <botan/entropy_src.h>
+#include <vector>
+#include <sys/types.h>
+
+namespace Botan {
+
+/**
+* Entropy source for generic Unix. Runs various programs trying to
+* gather data hard for a remote attacker to guess. Probably not too
+* effective against local attackers as they can sample from the same
+* distribution.
+*/
+class Unix_EntropySource : public EntropySource
+   {
+   public:
+      std::string name() const { return "Unix Process Runner"; }
+
+      void poll(Entropy_Accumulator& accum) override;
+
+      /**
+      * @param trusted_paths is a list of directories that are assumed
+      *        to contain only 'safe' binaries. If an attacker can write
+      *        an executable to one of these directories then we will
+      *        run arbitrary code.
+      */
+      Unix_EntropySource(const std::vector<std::string>& trusted_paths,
+                         size_t concurrent_processes = 0);
+   private:
+      static std::vector<std::vector<std::string>> get_default_sources();
+
+      class Unix_Process
+         {
+         public:
+            int fd() const { return m_fd; }
+
+            void spawn(const std::vector<std::string>& args);
+            void shutdown();
+
+            Unix_Process() {}
+
+            Unix_Process(const std::vector<std::string>& args) { spawn(args); }
+
+            ~Unix_Process() { shutdown(); }
+
+            Unix_Process(Unix_Process&& other)
+               {
+               std::swap(m_fd, other.m_fd);
+               std::swap(m_pid, other.m_pid);
+               }
+
+            Unix_Process(const Unix_Process&) = delete;
+            Unix_Process& operator=(const Unix_Process&) = delete;
+         private:
+            int m_fd = -1;
+            pid_t m_pid = -1;
+         };
+
+      const std::vector<std::string>& next_source();
+
+      const std::vector<std::string> m_trusted_paths;
+      const size_t m_concurrent;
+
+      std::vector<std::vector<std::string>> m_sources;
+      size_t m_sources_idx = 0;
+
+      std::vector<Unix_Process> m_procs;
+   };
+
+class UnixProcessInfo_EntropySource : public EntropySource
+   {
+   public:
+      std::string name() const { return "Unix Process Info"; }
+
+      void poll(Entropy_Accumulator& accum);
+   };
+
+}
+
+#endif