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s3: fix role_arn, credential_source, ...

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When the env_auth option is enabled, the AWS SDK's session constructor
now loads configuration from ~/.aws/config and environment variables,
and credentials per the selected (or default) AWS_PROFILE's settings.

This is accomplished by **NOT** including any Credential provider in the
aws.Config passed to the session constructor: If the Config.Credentials
is non-nil, that will always be used and the user's configuration re
role_arn, credential_source, source_profile, etc... from the shared
config will be completely ignored.

(The conditional creation and configuration of the stscreds Credential
provider is complicated enough that it is not worth re-creating that
logic.)
This commit is contained in:
Erik Swanson 2018-11-06 18:50:28 -08:00 committed by Nick Craig-Wood
parent 4ad08794c9
commit fa0a1e7261
1 changed files with 15 additions and 2 deletions
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17
backend/s3/s3.go
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@ -804,8 +804,21 @@ func s3Connection(opt *Options) (*s3.S3, *session.Session, error) {
WithHTTPClient(fshttp.NewClient(fs.Config)).
WithS3ForcePathStyle(opt.ForcePathStyle)
// awsConfig.WithLogLevel(aws.LogDebugWithSigning)
ses := session.New()
c := s3.New(ses, awsConfig)
awsSessionOpts := session.Options{
Config: *awsConfig,
}
if opt.EnvAuth && opt.AccessKeyID == "" && opt.SecretAccessKey == "" {
// Enable loading config options from ~/.aws/config (selected by AWS_PROFILE env)
awsSessionOpts.SharedConfigState = session.SharedConfigEnable
// The session constructor (aws/session/mergeConfigSrcs) will only use the user's preferred credential source
// (from the shared config file) if the passed-in Options.Config.Credentials is nil.
awsSessionOpts.Config.Credentials = nil
}
ses, err := session.NewSessionWithOptions(awsSessionOpts)
if err != nil {
return nil, nil, err
}
c := s3.New(ses)
if opt.V2Auth || opt.Region == "other-v2-signature" {
fs.Debugf(nil, "Using v2 auth")
signer := func(req *request.Request) {