Merge remote-tracking branch 'upstream/debian/experimental' into feature/no-more...

[apt.git] / apt-private / private-download.cc

diff --git a/apt-private/private-download.cc b/apt-private/private-download.cc
index a095f0c67a63285859a6cfa997a00ff3fb462e46..37fae18e91633c9d22bd3bbff375744b9186566e 100644 (file)
--- a/apt-private/private-download.cc
+++ b/apt-private/private-download.cc
@@ -5,6 +5,7 @@
 #include <apt-pkg/acquire-item.h>
 #include <apt-pkg/configuration.h>
 #include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
 #include <apt-pkg/strutl.h>
 
 #include <apt-private/private-output.h>
@@ -14,9 +15,66 @@
 #include <string>
 #include <vector>
 
+#include <unistd.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <fcntl.h>
+#include <sys/vfs.h>
+#include <sys/statvfs.h>
+#include <errno.h>
+
 #include <apti18n.h>
                                                                        /*}}}*/
 
+bool CheckDropPrivsMustBeDisabled(pkgAcquire &Fetcher)                 /*{{{*/
+{
+   // no need/possibility to drop privs
+   if(getuid() != 0)
+      return true;
+
+   // the user does not want to drop privs
+   std::string SandboxUser = _config->Find("APT::Sandbox::User");
+   if (SandboxUser.empty())
+      return true;
+
+   struct passwd const * const pw = getpwnam(SandboxUser.c_str());
+   if (pw == NULL)
+      return true;
+
+   if (seteuid(pw->pw_uid) != 0)
+      return _error->Errno("seteuid", "seteuid %u failed", pw->pw_uid);
+
+   bool res = true;
+   // check if we can write to destfile
+   for (pkgAcquire::ItemIterator I = Fetcher.ItemsBegin();
+       I != Fetcher.ItemsEnd() && res == true; ++I)
+   {
+      if ((*I)->DestFile.empty())
+        continue;
+      // we assume that an existing (partial) file means that we have sufficient rights
+      if (RealFileExists((*I)->DestFile))
+        continue;
+      int fd = open((*I)->DestFile.c_str(), O_CREAT | O_EXCL | O_RDWR, 0600);
+      if (fd < 0)
+      {
+        res = false;
+        std::string msg;
+        strprintf(msg, _("Can't drop privileges for downloading as file '%s' couldn't be accessed by user '%s'."),
+              (*I)->DestFile.c_str(), SandboxUser.c_str());
+        std::cerr << "W: " << msg << std::endl;
+        _config->Set("APT::Sandbox::User", "");
+        break;
+      }
+      unlink((*I)->DestFile.c_str());
+      close(fd);
+   }
+
+   if (seteuid(0) != 0)
+      return _error->Errno("seteuid", "seteuid %u failed", 0);
+
+   return res;
+}
+                                                                       /*}}}*/
 // CheckAuth - check if each download comes form a trusted source      /*{{{*/
 bool CheckAuth(pkgAcquire& Fetcher, bool const PromptUser)
 {
@@ -28,6 +86,11 @@ bool CheckAuth(pkgAcquire& Fetcher, bool const PromptUser)
    if (UntrustedList == "")
       return true;
 
+   return AuthPrompt(UntrustedList, PromptUser);
+}
+
+bool AuthPrompt(std::string const &UntrustedList, bool const PromptUser)
+{
    ShowList(c2out,_("WARNING: The following packages cannot be authenticated!"),UntrustedList,"");
 
    if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
@@ -93,3 +156,39 @@ bool AcquireRun(pkgAcquire &Fetcher, int const PulseInterval, bool * const Failu
    return true;
 }
                                                                        /*}}}*/
+bool CheckFreeSpaceBeforeDownload(std::string const &Dir, unsigned long long FetchBytes)/*{{{*/
+{
+   uint32_t const RAMFS_MAGIC = 0x858458f6;
+   /* Check for enough free space, but only if we are actually going to
+      download */
+   if (_config->FindB("APT::Get::Print-URIs", false) == true ||
+       _config->FindB("APT::Get::Download", true) == false)
+      return true;
+
+   struct statvfs Buf;
+   if (statvfs(Dir.c_str(),&Buf) != 0) {
+      if (errno == EOVERFLOW)
+        return _error->WarningE("statvfs",_("Couldn't determine free space in %s"),
+              Dir.c_str());
+      else
+        return _error->Errno("statvfs",_("Couldn't determine free space in %s"),
+              Dir.c_str());
+   }
+   else
+   {
+      unsigned long long const FreeBlocks = _config->Find("APT::Sandbox::User").empty() ? Buf.f_bfree : Buf.f_bavail;
+      if (FreeBlocks < (FetchBytes / Buf.f_bsize))
+      {
+        struct statfs Stat;
+        if (statfs(Dir.c_str(),&Stat) != 0
+#if HAVE_STRUCT_STATFS_F_TYPE
+              || Stat.f_type != RAMFS_MAGIC
+#endif
+           )
+           return _error->Error(_("You don't have enough free space in %s."),
+                 Dir.c_str());
+      }
+   }
+   return true;
+}
+                                                                       /*}}}*/