From 58839cefb50e56ae5b157b37e9814ae83ceee70b Mon Sep 17 00:00:00 2001 From: Christopher Speller Date: Thu, 20 Jul 2017 15:22:49 -0700 Subject: Upgrading server dependancies (#6984) --- .../minio/minio-go/pkg/credentials/iam_aws.go | 227 +++++++++++++++++++++ 1 file changed, 227 insertions(+) create mode 100644 vendor/github.com/minio/minio-go/pkg/credentials/iam_aws.go (limited to 'vendor/github.com/minio/minio-go/pkg/credentials/iam_aws.go') diff --git a/vendor/github.com/minio/minio-go/pkg/credentials/iam_aws.go b/vendor/github.com/minio/minio-go/pkg/credentials/iam_aws.go new file mode 100644 index 000000000..b862cf538 --- /dev/null +++ b/vendor/github.com/minio/minio-go/pkg/credentials/iam_aws.go @@ -0,0 +1,227 @@ +/* + * Minio Go Library for Amazon S3 Compatible Cloud Storage + * (C) 2017 Minio, Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package credentials + +import ( + "bufio" + "encoding/json" + "errors" + "net/http" + "net/url" + "path" + "time" +) + +// DefaultExpiryWindow - Default expiry window. +// ExpiryWindow will allow the credentials to trigger refreshing +// prior to the credentials actually expiring. This is beneficial +// so race conditions with expiring credentials do not cause +// request to fail unexpectedly due to ExpiredTokenException exceptions. +const DefaultExpiryWindow = time.Second * 10 // 10 secs + +// A IAM retrieves credentials from the EC2 service, and keeps track if +// those credentials are expired. +type IAM struct { + Expiry + + // Required http Client to use when connecting to IAM metadata service. + Client *http.Client + + // Custom endpoint to fetch IAM role credentials. + endpoint string +} + +// redirectHeaders copies all headers when following a redirect URL. +// This won't be needed anymore from go 1.8 (https://github.com/golang/go/issues/4800) +func redirectHeaders(req *http.Request, via []*http.Request) error { + if len(via) == 0 { + return nil + } + for key, val := range via[0].Header { + req.Header[key] = val + } + return nil +} + +// IAM Roles for Amazon EC2 +// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html +const ( + defaultIAMRoleEndpoint = "http://169.254.169.254" + defaultIAMSecurityCredsPath = "/latest/meta-data/iam/security-credentials" +) + +// NewIAM returns a pointer to a new Credentials object wrapping +// the IAM. Takes a ConfigProvider to create a EC2Metadata client. +// The ConfigProvider is satisfied by the session.Session type. +func NewIAM(endpoint string) *Credentials { + if endpoint == "" { + endpoint = defaultIAMRoleEndpoint + } + p := &IAM{ + Client: &http.Client{ + Transport: http.DefaultTransport, + CheckRedirect: redirectHeaders, + }, + endpoint: endpoint, + } + return New(p) +} + +// Retrieve retrieves credentials from the EC2 service. +// Error will be returned if the request fails, or unable to extract +// the desired +func (m *IAM) Retrieve() (Value, error) { + roleCreds, err := getCredentials(m.Client, m.endpoint) + if err != nil { + return Value{}, err + } + + // Expiry window is set to 10secs. + m.SetExpiration(roleCreds.Expiration, DefaultExpiryWindow) + + return Value{ + AccessKeyID: roleCreds.AccessKeyID, + SecretAccessKey: roleCreds.SecretAccessKey, + SessionToken: roleCreds.Token, + SignerType: SignatureV4, + }, nil +} + +// A ec2RoleCredRespBody provides the shape for unmarshaling credential +// request responses. +type ec2RoleCredRespBody struct { + // Success State + Expiration time.Time + AccessKeyID string + SecretAccessKey string + Token string + + // Error state + Code string + Message string + + // Unused params. + LastUpdated time.Time + Type string +} + +// Get the final IAM role URL where the request will +// be sent to fetch the rolling access credentials. +// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html +func getIAMRoleURL(endpoint string) (*url.URL, error) { + if endpoint == "" { + endpoint = defaultIAMRoleEndpoint + } + u, err := url.Parse(endpoint) + if err != nil { + return nil, err + } + u.Path = defaultIAMSecurityCredsPath + return u, nil +} + +// listRoleNames lists of credential role names associated +// with the current EC2 service. If there are no credentials, +// or there is an error making or receiving the request. +// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html +func listRoleNames(client *http.Client, u *url.URL) ([]string, error) { + req, err := http.NewRequest("GET", u.String(), nil) + if err != nil { + return nil, err + } + resp, err := client.Do(req) + if err != nil { + return nil, err + } + defer resp.Body.Close() + if resp.StatusCode != http.StatusOK { + return nil, errors.New(resp.Status) + } + + credsList := []string{} + s := bufio.NewScanner(resp.Body) + for s.Scan() { + credsList = append(credsList, s.Text()) + } + + if err := s.Err(); err != nil { + return nil, err + } + + return credsList, nil +} + +// getCredentials - obtains the credentials from the IAM role name associated with +// the current EC2 service. +// +// If the credentials cannot be found, or there is an error +// reading the response an error will be returned. +func getCredentials(client *http.Client, endpoint string) (ec2RoleCredRespBody, error) { + // http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html + u, err := getIAMRoleURL(endpoint) + if err != nil { + return ec2RoleCredRespBody{}, err + } + + // http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html + roleNames, err := listRoleNames(client, u) + if err != nil { + return ec2RoleCredRespBody{}, err + } + + if len(roleNames) == 0 { + return ec2RoleCredRespBody{}, errors.New("No IAM roles attached to this EC2 service") + } + + // http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html + // - An instance profile can contain only one IAM role. This limit cannot be increased. + roleName := roleNames[0] + + // http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html + // The following command retrieves the security credentials for an + // IAM role named `s3access`. + // + // $ curl http://169.254.169.254/latest/meta-data/iam/security-credentials/s3access + // + u.Path = path.Join(u.Path, roleName) + req, err := http.NewRequest("GET", u.String(), nil) + if err != nil { + return ec2RoleCredRespBody{}, err + } + + resp, err := client.Do(req) + if err != nil { + return ec2RoleCredRespBody{}, err + } + defer resp.Body.Close() + if resp.StatusCode != http.StatusOK { + return ec2RoleCredRespBody{}, errors.New(resp.Status) + } + + respCreds := ec2RoleCredRespBody{} + if err := json.NewDecoder(resp.Body).Decode(&respCreds); err != nil { + return ec2RoleCredRespBody{}, err + } + + if respCreds.Code != "Success" { + // If an error code was returned something failed requesting the role. + return ec2RoleCredRespBody{}, errors.New(respCreds.Message) + } + + return respCreds, nil +} -- cgit v1.2.3-1-g7c22