104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
package ssh
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import (
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"context"
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"github.com/hashicorp/vault/api"
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"github.com/hashicorp/vault/logical"
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"github.com/hashicorp/vault/logical/framework"
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)
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func pathVerify(b *backend) *framework.Path {
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return &framework.Path{
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Pattern: "verify",
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Fields: map[string]*framework.FieldSchema{
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"otp": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "[Required] One-Time-Key that needs to be validated",
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},
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},
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Callbacks: map[logical.Operation]framework.OperationFunc{
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logical.UpdateOperation: b.pathVerifyWrite,
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},
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HelpSynopsis: pathVerifyHelpSyn,
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HelpDescription: pathVerifyHelpDesc,
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}
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}
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func (b *backend) getOTP(ctx context.Context, s logical.Storage, n string) (*sshOTP, error) {
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entry, err := s.Get(ctx, "otp/"+n)
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if err != nil {
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return nil, err
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}
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if entry == nil {
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return nil, nil
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}
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var result sshOTP
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if err := entry.DecodeJSON(&result); err != nil {
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return nil, err
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}
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return &result, nil
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}
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func (b *backend) pathVerifyWrite(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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otp := d.Get("otp").(string)
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// If OTP is not a UUID and a string matching VerifyEchoRequest, then the
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// response will be VerifyEchoResponse. This is used by agent to check if
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// connection to Vault server is proper.
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if otp == api.VerifyEchoRequest {
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return &logical.Response{
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Data: map[string]interface{}{
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"message": api.VerifyEchoResponse,
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},
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}, nil
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}
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// Create the salt of OTP because entry would have been create with the
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// salt and not directly of the OTP. Salt will yield the same value which
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// because the seed is the same, the backend salt.
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salt, err := b.Salt(ctx)
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if err != nil {
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return nil, err
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}
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otpSalted := salt.SaltID(otp)
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// Return nil if there is no entry found for the OTP
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otpEntry, err := b.getOTP(ctx, req.Storage, otpSalted)
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if err != nil {
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return nil, err
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}
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if otpEntry == nil {
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return logical.ErrorResponse("OTP not found"), nil
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}
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// Delete the OTP if found. This is what makes the key an OTP.
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err = req.Storage.Delete(ctx, "otp/"+otpSalted)
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if err != nil {
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return nil, err
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}
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// Return username and IP only if there were no problems uptill this point.
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return &logical.Response{
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Data: map[string]interface{}{
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"username": otpEntry.Username,
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"ip": otpEntry.IP,
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"role_name": otpEntry.RoleName,
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},
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}, nil
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}
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const pathVerifyHelpSyn = `
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Validate the OTP provided by Vault SSH Agent.
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`
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const pathVerifyHelpDesc = `
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This path will be used by Vault SSH Agent running in the remote hosts. The OTP
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provided by the client is sent to Vault for validation by the agent. If Vault
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finds an entry for the OTP, it responds with the username and IP it is associated
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with. Agent uses this information to authenticate the client. Vault deletes the
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OTP after validating it once.
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`
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