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path_role_create.go
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/
path_role_create.go
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package postgresql
import (
"context"
"fmt"
"strings"
"time"
"github.com/hashicorp/go-uuid"
"github.com/hashicorp/vault/helper/dbtxn"
"github.com/hashicorp/vault/helper/strutil"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
_ "github.com/lib/pq"
)
func pathRoleCreate(b *backend) *framework.Path {
return &framework.Path{
Pattern: "creds/" + framework.GenericNameRegex("name"),
Fields: map[string]*framework.FieldSchema{
"name": &framework.FieldSchema{
Type: framework.TypeString,
Description: "Name of the role.",
},
},
Callbacks: map[logical.Operation]framework.OperationFunc{
logical.ReadOperation: b.pathRoleCreateRead,
},
HelpSynopsis: pathRoleCreateReadHelpSyn,
HelpDescription: pathRoleCreateReadHelpDesc,
}
}
func (b *backend) pathRoleCreateRead(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
name := data.Get("name").(string)
// Get the role
role, err := b.Role(ctx, req.Storage, name)
if err != nil {
return nil, err
}
if role == nil {
return logical.ErrorResponse(fmt.Sprintf("unknown role: %s", name)), nil
}
// Determine if we have a lease
lease, err := b.Lease(ctx, req.Storage)
if err != nil {
return nil, err
}
// Unlike some other backends we need a lease here (can't leave as 0 and
// let core fill it in) because Postgres also expires users as a safety
// measure, so cannot be zero
if lease == nil {
lease = &configLease{
Lease: b.System().DefaultLeaseTTL(),
}
}
// Generate the username, password and expiration. PG limits user to 63 characters
displayName := req.DisplayName
if len(displayName) > 26 {
displayName = displayName[:26]
}
userUUID, err := uuid.GenerateUUID()
if err != nil {
return nil, err
}
username := fmt.Sprintf("%s-%s", displayName, userUUID)
if len(username) > 63 {
username = username[:63]
}
password, err := uuid.GenerateUUID()
if err != nil {
return nil, err
}
ttl, _, err := framework.CalculateTTL(b.System(), 0, lease.Lease, 0, lease.LeaseMax, 0, time.Time{})
if err != nil {
return nil, err
}
expiration := time.Now().
Add(ttl).
Format("2006-01-02 15:04:05-0700")
// Get our handle
db, err := b.DB(ctx, req.Storage)
if err != nil {
return nil, err
}
// Start a transaction
tx, err := db.Begin()
if err != nil {
return nil, err
}
defer func() {
tx.Rollback()
}()
// Execute each query
for _, query := range strutil.ParseArbitraryStringSlice(role.SQL, ";") {
query = strings.TrimSpace(query)
if len(query) == 0 {
continue
}
m := map[string]string{
"name": username,
"password": password,
"expiration": expiration,
}
if err := dbtxn.ExecuteTxQuery(ctx, tx, m, query); err != nil {
return nil, err
}
}
// Commit the transaction
if err := tx.Commit(); err != nil {
return nil, err
}
// Return the secret
resp := b.Secret(SecretCredsType).Response(map[string]interface{}{
"username": username,
"password": password,
}, map[string]interface{}{
"username": username,
"role": name,
})
resp.Secret.TTL = lease.Lease
resp.Secret.MaxTTL = lease.LeaseMax
return resp, nil
}
const pathRoleCreateReadHelpSyn = `
Request database credentials for a certain role.
`
const pathRoleCreateReadHelpDesc = `
This path reads database credentials for a certain role. The
database credentials will be generated on demand and will be automatically
revoked when the lease is up.
`