Authentication
- Token authentication: Requests are authenticated using tokens.
- AK/SK authentication: Requests are encrypted using AK/SK pairs. AK/SK authentication is recommended because it is more secure than token authentication.
Token Authentication
![](https://support.huaweicloud.com/intl/en-us/api-rms/public_sys-resources/note_3.0-en-us.png)
The validity period of a token is 24 hours. When using a token for authentication, cache it to prevent frequently calling the IAM API used to obtain a user token.
A token specifies temporary permissions in a computer system. During API authentication using a token, the token is added to requests to get permissions for calling the API. You can obtain a token by calling the Obtaining a User Token API.
- For a project-level service, you need to obtain a project-level token. When you call the API, set auth.scope in the request body to project.
- For a global service, you need to obtain a global token. When you call the API, set auth.scope in the request body to domain.
Config is a global service. When you call the API, set auth.scope in the request body to domain. For details about how to obtain the user token, see Obtaining a User Token.
{ "auth": { "identity": { "methods": [ "password" ], "password": { "user": { "name": "username", // IAM user name "password": "********", // IAM user password "domain": { "name": "domainname" // Name of the account to which the IAM user belongs } } } }, "scope": { "domain": { "name": "xxxxxxxx" // Tenant name } } } }
After a token is obtained, the X-Auth-Token header field must be added to requests to specify the token when calling other APIs. For example, if the token is ABCDEFJ...., X-Auth-Token: ABCDEFJ.... can be added to a request as follows:
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POST https://iam.ap-southeast-1.myhuaweicloud.com/v3/auth/projects Content-Type: application/json X-Auth-Token: ABCDEFJ.... |
AK/SK Authentication
![](https://support.huaweicloud.com/intl/en-us/api-rms/public_sys-resources/note_3.0-en-us.png)
AK/SK authentication supports API requests with a body not larger than 12 MB. For API requests with a larger body, token authentication is recommended.
In AK/SK authentication, AK/SK is used to sign requests and the signature is then added to the requests for authentication.
- AK: access key ID, which is a unique identifier used in conjunction with a secret access key to sign requests cryptographically.
- SK: secret access key, which is used in conjunction with an AK to sign requests cryptographically. It identifies a request sender and prevents the request from being modified.
In AK/SK authentication, you can use an AK/SK to sign requests based on the signature algorithm or using the signing SDK. For details about how to sign requests and use the signing SDK, see API Request Signing Guide.
![](https://support.huaweicloud.com/intl/en-us/api-rms/public_sys-resources/note_3.0-en-us.png)
The signing SDK is only used for signing requests and is different from the SDKs provided by services.
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