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Better Handling for Expired Credentials

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When AWS credentials expired, in some scenarios they led to the
nix process aborting with an error similar to ' Unable to parse ExceptionName: ExpiredToken'.

This change updates the S3 handling code such that those errors are treated like 403s or 404s.

Closes #13459
This commit is contained in:
Justin Bailey 2025-07-11 17:30:03 -07:00
parent ab3cd76e73
commit a48632f2e0
1 changed files with 18 additions and 3 deletions
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21
src/libstore/s3-binary-cache-store.cc
View file

@ -37,10 +37,11 @@ namespace nix {
struct S3Error : public Error
{
Aws::S3::S3Errors err;
Aws::String exceptionName;
template<typename... Args>
S3Error(Aws::S3::S3Errors err, const Args & ... args)
: Error(args...), err(err) { };
S3Error(Aws::S3::S3Errors err, Aws::String exceptionName, const Args & ... args)
: Error(args...), err(err), exceptionName(exceptionName) { };
};
/* Helper: given an Outcome<R, E>, return R in case of success, or
@ -51,6 +52,7 @@ R && checkAws(std::string_view s, Aws::Utils::Outcome<R, E> && outcome)
if (!outcome.IsSuccess())
throw S3Error(
outcome.GetError().GetErrorType(),
outcome.GetError().GetExceptionName(),
fmt(
"%s: %s (request id: %s)",
s,
@ -226,7 +228,13 @@ S3Helper::FileTransferResult S3Helper::getObject(
} catch (S3Error & e) {
if ((e.err != Aws::S3::S3Errors::NO_SUCH_KEY) &&
(e.err != Aws::S3::S3Errors::ACCESS_DENIED)) throw;
(e.err != Aws::S3::S3Errors::ACCESS_DENIED) &&
// Expired tokens are not really an error, more of a caching problem. Should be treated same as 403.
//
// AWS unwilling to provide a specific error type for the situation (https://github.com/aws/aws-sdk-cpp/issues/1843)
// so use this hack
(e.exceptionName != "ExpiredToken")
) throw;
}
auto now2 = std::chrono::steady_clock::now();
@ -325,15 +333,22 @@ struct S3BinaryCacheStoreImpl : virtual S3BinaryCacheStore
{
stats.head++;
// error: AWS error fetching 'vjgpmfn7s6vkynymnk8jfx2fcxnsbd6b.narinfo': Unable to parse ExceptionName: ExpiredToken Message: The provided token has expired.
auto res = s3Helper.client->HeadObject(
Aws::S3::Model::HeadObjectRequest()
.WithBucket(config->bucketName)
.WithKey(path));
printError("Checking for file");
if (!res.IsSuccess()) {
auto & error = res.GetError();
if (error.GetErrorType() == Aws::S3::S3Errors::RESOURCE_NOT_FOUND
|| error.GetErrorType() == Aws::S3::S3Errors::NO_SUCH_KEY
// Expired tokens are not really an error, more of a caching problem. Should be treated same as 403.
// AWS unwilling to provide a specific error type for the situation (https://github.com/aws/aws-sdk-cpp/issues/1843)
// so use this hack
|| (error.GetErrorType() == Aws::S3::S3Errors::UNKNOWN && error.GetExceptionName() == "ExpiredToken")
// If bucket listing is disabled, 404s turn into 403s
|| error.GetErrorType() == Aws::S3::S3Errors::ACCESS_DENIED)
return false;