diff options
Diffstat (limited to 'vendor/github.com/aws/aws-sdk-go/aws/credentials/stscreds/assume_role_provider.go')
| -rw-r--r-- | vendor/github.com/aws/aws-sdk-go/aws/credentials/stscreds/assume_role_provider.go | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/vendor/github.com/aws/aws-sdk-go/aws/credentials/stscreds/assume_role_provider.go b/vendor/github.com/aws/aws-sdk-go/aws/credentials/stscreds/assume_role_provider.go index 4108e433e..2e528d130 100644 --- a/vendor/github.com/aws/aws-sdk-go/aws/credentials/stscreds/assume_role_provider.go +++ b/vendor/github.com/aws/aws-sdk-go/aws/credentials/stscreds/assume_role_provider.go @@ -80,16 +80,18 @@ package stscreds import ( "fmt" + "os" "time" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/awserr" "github.com/aws/aws-sdk-go/aws/client" "github.com/aws/aws-sdk-go/aws/credentials" + "github.com/aws/aws-sdk-go/internal/sdkrand" "github.com/aws/aws-sdk-go/service/sts" ) -// StdinTokenProvider will prompt on stdout and read from stdin for a string value. +// StdinTokenProvider will prompt on stderr and read from stdin for a string value. // An error is returned if reading from stdin fails. // // Use this function go read MFA tokens from stdin. The function makes no attempt @@ -102,7 +104,7 @@ import ( // Will wait forever until something is provided on the stdin. func StdinTokenProvider() (string, error) { var v string - fmt.Printf("Assume Role MFA token code: ") + fmt.Fprintf(os.Stderr, "Assume Role MFA token code: ") _, err := fmt.Scanln(&v) return v, err @@ -193,6 +195,18 @@ type AssumeRoleProvider struct { // // If ExpiryWindow is 0 or less it will be ignored. ExpiryWindow time.Duration + + // MaxJitterFrac reduces the effective Duration of each credential requested + // by a random percentage between 0 and MaxJitterFraction. MaxJitterFrac must + // have a value between 0 and 1. Any other value may lead to expected behavior. + // With a MaxJitterFrac value of 0, default) will no jitter will be used. + // + // For example, with a Duration of 30m and a MaxJitterFrac of 0.1, the + // AssumeRole call will be made with an arbitrary Duration between 27m and + // 30m. + // + // MaxJitterFrac should not be negative. + MaxJitterFrac float64 } // NewCredentials returns a pointer to a new Credentials object wrapping the @@ -244,7 +258,6 @@ func NewCredentialsWithClient(svc AssumeRoler, roleARN string, options ...func(* // Retrieve generates a new set of temporary credentials using STS. func (p *AssumeRoleProvider) Retrieve() (credentials.Value, error) { - // Apply defaults where parameters are not set. if p.RoleSessionName == "" { // Try to work out a role name that will hopefully end up unique. @@ -254,8 +267,9 @@ func (p *AssumeRoleProvider) Retrieve() (credentials.Value, error) { // Expire as often as AWS permits. p.Duration = DefaultDuration } + jitter := time.Duration(sdkrand.SeededRand.Float64() * p.MaxJitterFrac * float64(p.Duration)) input := &sts.AssumeRoleInput{ - DurationSeconds: aws.Int64(int64(p.Duration / time.Second)), + DurationSeconds: aws.Int64(int64((p.Duration - jitter) / time.Second)), RoleArn: aws.String(p.RoleARN), RoleSessionName: aws.String(p.RoleSessionName), ExternalId: p.ExternalID, |