Add a Packages-Require-Authorization Release file field

This new field allows a repository to declare that access to
packages requires authorization. The current implementation will
set the pin to -32768 if no authorization has been provided in
the auth.conf(.d) files.

This implementation is suboptimal in two aspects:
(1) A repository should behave more like NotSource repositories
(2) We only have the host name for the repository, we cannot use
    paths yet.

- We can fix those after an ABI break.

The code also adds a check to acquire-item.cc to not use the
specified repository as a download source, mimicking NotSource.

(cherry picked from commit c2b9b0489538fed4770515bd8853a960b13a2618)
LP: #1814727
(cherry picked from commit d75162bc67d5a1a690eb2a8747d31ad68353823e)

1 files changed, 44 insertions, 0 deletions

diff --git a/apt-pkg/contrib/netrc.cc b/apt-pkg/contrib/netrc.cc
index ed8b2aa88..f741bc684 100644
--- a/apt-pkg/contrib/netrc.cc
+++ b/apt-pkg/contrib/netrc.cc
@@ -14,6 +14,7 @@
 #include <config.h>
 
 #include <apt-pkg/configuration.h>
+#include <apt-pkg/error.h>
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/strutl.h>
 
@@ -150,3 +151,46 @@ void maybe_add_auth(URI &Uri, std::string NetRCFile)
    if (fd.Open(NetRCFile, FileFd::ReadOnly))
       MaybeAddAuth(fd, Uri);
 }
+
+/* Check if we are authorized. */
+bool IsAuthorized(pkgCache::PkgFileIterator const I, std::vector<std::unique_ptr<FileFd>> &authconfs)
+{
+   if (authconfs.empty())
+   {
+      _error->PushToStack();
+      auto const netrc = _config->FindFile("Dir::Etc::netrc");
+      if (not netrc.empty())
+      {
+	 authconfs.emplace_back(new FileFd());
+	 authconfs.back()->Open(netrc, FileFd::ReadOnly);
+      }
+
+      auto const netrcparts = _config->FindDir("Dir::Etc::netrcparts");
+      if (not netrcparts.empty())
+      {
+	 for (auto const &netrc : GetListOfFilesInDir(netrcparts, "conf", true, true))
+	 {
+	    authconfs.emplace_back(new FileFd());
+	    authconfs.back()->Open(netrc, FileFd::ReadOnly);
+	 }
+      }
+      _error->RevertToStack();
+   }
+
+   // FIXME: Use the full base url
+   URI uri(std::string("http://") + I.Site() + "/");
+   for (auto &authconf : authconfs)
+   {
+      if (not authconf->IsOpen())
+	 continue;
+      if (not authconf->Seek(0))
+	 continue;
+
+      MaybeAddAuth(*authconf, uri);
+
+      if (not uri.User.empty() || not uri.Password.empty())
+	 return true;
+   }
+
+   return false;
+}