3.3. Managing S3 Users

The concept of S3 user is one of the base concepts of object storage along with those of object and bucket (container for storing objects). Amazon S3 protocol uses permissions model based on access control lists (ACLs) where each bucket and each object is assigned an ACL that lists all users with access to the given resource and the type of this access (read, write, read ACL, write ACL). The list of users includes entity owner assigned to every object and bucket at creation. Entity owner has extra rights compared to other users, for example, bucket owner is the only one who can delete that bucket.

User model and access policies implemented in Acronis Object Storage comply with the Amazon S3 user model and access policies.

User management scenarios in Acronis Object Storage are largely based on the Amazon Web Services user management and include the following operations: create, query, delete users as well as generate, revoke user access key pairs.

3.3.1. Creating S3 Users

You can generate a unique random S3 user ID and an access key pair (S3 Access Key ID, S3 Secret Access Key) using the ostor-s3-admin create-user command. You need to specify a user email. For example:

# ostor-s3-admin create-user -e user@email.com
UserEmail:user@email.com
UserId:a49e12a226bd760f
KeyPair[0]:S3AccessKeyId:a49e12a226bd760fGHQ7
KeyPair[0]:S3SecretAccessKey:HSDu2DA00JNGjnRcAhLKfhrvlymzOVdLPsCK2dcq
Flags:none

S3 user ID is a 16-digit hexadecimal string. The generated access key pair is used to sign requests to the S3 object storage according to the Amazon S3 Signature Version 2 authentication scheme.

3.3.2. Listing S3 Users

You can list all object storage users with the ostor-s3-admin query-users command. Information for each user can take one or more sequential rows in the table. Additional rows are used to lists S3 access key pairs associated with the user. If the user does not have any active key pairs, minus signs are shown in the corresponding table cells. For example:

# ostor-s3-admin query-users
      S3 USER ID      S3 ACCESS KEY ID              S3 SECRET ACCESS KEY  S3 USER EMAIL
bf0b3b15eb7c9019  bf0b3b15eb7c9019I36Y                               ***  user2@abc.com
d866d9d114cc3d20  d866d9d114cc3d20G456                               ***  user1@abc.com
                  d866d9d114cc3d20D8EW                               ***
e86d1c19e616455                      -                                 -  user3@abc.com

To output the list in XML, use the -X option; to output secret keys, use the -a option. For example:

# ostor-s3-admin query-users -a -X
<?xml version="1.0" encoding="UTF-8"?><QueryUsersResult><Users><User><Id>a49e12a226bd760f</Id><Email>user@email.com</Email><Keys><OwnerId>0000000000000000</OwnerId><KeyPair><S3AccessKeyId>a49e12a226bd760fGHQ7</S3AccessKeyId><S3SecretAccessKey>HSDu2DA00JNGjnRcAhLKfhrvlymzOVdLPsCK2dcq</S3SecretAccessKey></KeyPair></Keys></User><User><Id>d7c53fc1f931661f</Id><Email>user@email.com</Email><Keys><OwnerId>0000000000000000</OwnerId><KeyPair><S3AccessKeyId>d7c53fc1f931661fZLIV</S3AccessKeyId><S3SecretAccessKey>JL7gt1OH873zR0Fzv8Oh9ZuA6JtCVnkgV7lET6ET</S3SecretAccessKey></KeyPair></Keys></User></Users></QueryUsersResult>

3.3.3. Querying S3 User Information

To display information about the specified user, use the ostor-s3-admin query-user-info command. You need to specify either the user email (-e) or S3 ID (-i). For example:

# ostor-s3-admin query-user-info -e user@email.com
Query user: user id=d866d9d114cc3d20, user email=user@email.com
Key pair[0]: access key id=d866d9d114cc3d20G456,
secret access key=5EAne6PLL1jxprouRqq8hmfONMfgrJcOwbowCoTt
Key pair[1]: access key id=d866d9d114cc3d20D8EW,
secret access key=83tTsNAuuRyoBBqhxMFqHAC60dhKHtTCCkQe54zu

3.3.4. Disabling S3 Users

You can disable a user with the ostor-s3-admin disable-user command. You need to specify either the user email (-e) or S3 ID (-i). For example:

# ostor-s3-admin disable-user -e user@email.com

3.3.5. Deleting S3 Users

You can delete existing object storage users with the ostor-s3-admin delete-user command. Users who own any buckets cannot be deleted, so delete user’s buckets first. You need to specify either the user email (-e) or S3 ID (-i). For example:

# ostor-s3-admin delete-user -i bf0b3b15eb7c9019
Deleted user: user id=bf0b3b15eb7c9019

3.3.6. Generating S3 User Access Key Pairs

You can generate a new access key pair for the specified user with the ostor-s3-admin gen-access-key command. The maximum of 2 active access key pairs are allowed per user (same as with the Amazon Web Services). You need to specify either the user email (-e) or S3 ID (-i). For example:

# ostor-s3-admin gen-access-key -e user@email.com
Generate access key: user id=d866d9d114cc3d20, access key id=d866d9d114cc3d20D8EW,
secret access key=83tTsNAuuRyoBBqhxMFqHAC60dhKHtTCCkQe54zu

Note

It is recommended to periodically revoke old and generate new access key pairs.

3.3.7. Revoking S3 User Access Key Pairs

You can revoke the specified access key pair of the specified user with the ostor-s3-admin revoke-access-key command. You need to specify the access key in the key pair you want to delete as well as the user email or S3 ID. For example:

# ostor-s3-admin revoke-access-key -e user@email.com -k de86d1c19e616455YIPU
Revoke access key: user id=de86d1c19e616455, access key id=de86d1c19e616455YIPU

Note

It is recommended to periodically revoke old and generate new access key pairs.