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fix passing CA files into builtins:fetchurl sandbox

Browse Source 
This patch has been manually adapted from
14dc84ed03

Tested with:

$ NIX_SSL_CERT_FILE=$(nix-build '<nixpkgs>' -A cacert)/etc/ssl/certs/ca-bundle.crt nix-build --store $(mktemp -d) -E 'import <nix/fetchurl.nix> { url = https://google.com; }'
warning: found empty hash, assuming 'sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA='
this derivation will be built:
  /nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv
building '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv'...
error:
       … writing file '/nix/store/0zynn4n8yx59bczy1mgh1lq2rnprvvrc-google.com'

       error: unable to download 'https://google.com': Problem with the SSL CA cert (path? access rights?) (77)
error: builder for '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv' failed with exit code 1

Now returns:

nix-env % NIX_SSL_CERT_FILE=$(nix-build '<nixpkgs>' -A cacert)/etc/ssl/certs/ca-bundle.crt nix-build --store $(mktemp -d) -E 'import <nix/fetchurl.nix> { url = https://google.com; }'
this derivation will be built:
  /nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv
building '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv'...
error: hash mismatch in fixed-output derivation '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv':
         specified: sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
            got:    sha256-5xXEhGtnRdopaUTqaz2M1o2NE7ovhU0SjcSOPwntqwY=

(cherry picked from commit 1fbdf409524bb350b8614f3d95067cb9ba3c57f2)
This commit is contained in:
Puck Meerburg 2024-09-28 16:54:39 +02:00 committed by Robert Hensing
parent 8f3bda8276
commit b61952212e
3 changed files with 24 additions and 9 deletions
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21
src/libstore/build/local-derivation-goal.cc
View File

@ -1731,13 +1731,20 @@ void LocalDerivationGoal::runChild()
bool setUser = true;
/* Make the contents of netrc available to builtin:fetchurl
(which may run under a different uid and/or in a sandbox). */
/* Make the contents of netrc and the CA certificate bundle
available to builtin:fetchurl (which may run under a
different uid and/or in a sandbox). */
std::string netrcData;
try {
if (drv->isBuiltin() && drv->builder == "builtin:fetchurl")
netrcData = readFile(settings.netrcFile);
} catch (SysError &) { }
std::string caFileData;
if (drv->isBuiltin() && drv->builder == "builtin:fetchurl") {
try {
netrcData = readFile(settings.netrcFile);
} catch (SysError &) { }
try {
caFileData = readFile(settings.caFile);
} catch (SysError &) { }
}
#if __linux__
if (useChroot) {
@ -2185,7 +2192,7 @@ void LocalDerivationGoal::runChild()
e.second = rewriteStrings(e.second, inputRewrites);
if (drv->builder == "builtin:fetchurl")
builtinFetchurl(drv2, netrcData);
builtinFetchurl(drv2, netrcData, caFileData);
else if (drv->builder == "builtin:buildenv")
builtinBuildenv(drv2);
else if (drv->builder == "builtin:unpack-channel")

4
src/libstore/builtins.hh
View File

@ -6,7 +6,9 @@
namespace nix {
// TODO: make pluggable.
void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData);
void builtinFetchurl(const BasicDerivation & drv,
const std::string & netrcData,
const std::string & caFileData);
void builtinUnpackChannel(const BasicDerivation & drv);
}

8
src/libstore/builtins/fetchurl.cc
View File

@ -6,7 +6,10 @@
namespace nix {
void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
void builtinFetchurl(
const BasicDerivation & drv,
const std::string & netrcData,
const std::string & caFileData)
{
/* Make the host's netrc data available. Too bad curl requires
this to be stored in a file. It would be nice if we could just
@ -16,6 +19,9 @@ void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData)
writeFile(settings.netrcFile, netrcData, 0600);
}
settings.caFile = "ca-certificates.crt";
writeFile(settings.caFile, caFileData, 0600);
auto getAttr = [&](const std::string & name) {
auto i = drv.env.find(name);
if (i == drv.env.end()) throw Error("attribute '%s' missing", name);