Adds the ability to bypass Okta MFA checks. (#3944)

* Adds the ability to bypass Okta MFA checks.

Unlike before, the administrator opts-in to this behavior, and is
suitably warned.

Fixes #3872

builtin/credential/okta/backend.go

@@ -115,6 +115,11 @@ func (b *backend) Login(ctx context.Context, req *logical.Request, username stri
 	case "PASSWORD_WARN":
 		oktaResponse.AddWarning("Your Okta password is in warning state and needs to be changed soon.")
 
+	case "MFA_REQUIRED", "MFA_ENROLL":
+		if !cfg.BypassOktaMFA {
+			return nil, logical.ErrorResponse("okta mfa required for this account but mfa bypass not set in config"), nil, nil
+		}
+
 	case "SUCCESS":
 		// Do nothing here
 
@@ -126,7 +131,13 @@ func (b *backend) Login(ctx context.Context, req *logical.Request, username stri
 	}
 
 	// Verify result status again in case a switch case above modifies result
-	if result.Status != "SUCCESS" && result.Status != "PASSWORD_WARN" {
+	switch {
+	case result.Status == "SUCCESS",
+		result.Status == "PASSWORD_WARN",
+		result.Status == "MFA_REQUIRED" && cfg.BypassOktaMFA,
+		result.Status == "MFA_ENROLL" && cfg.BypassOktaMFA:
+		// Allowed
+	default:
 		if b.Logger().IsDebug() {
 			b.Logger().Debug("auth/okta: authentication returned a non-success status", "status", result.Status)
 		}

builtin/credential/okta/path_config.go

@@ -54,6 +54,10 @@ func pathConfig(b *backend) *framework.Path {
 				Type:        framework.TypeDurationSecond,
 				Description: `Maximum duration after which authentication will be expired`,
 			},
+			"bypass_okta_mfa": &framework.FieldSchema{
+				Type:        framework.TypeBool,
+				Description: `When set true, requests by Okta for a MFA check will be bypassed. This also disallows certain status checks on the account, such as whether the password is expired.`,
+			},
 		},
 
 		Callbacks: map[logical.Operation]framework.OperationFunc{
@@ -103,6 +107,7 @@ func (b *backend) pathConfigRead(ctx context.Context, req *logical.Request, d *f
 			"org_name":        cfg.Org,
 			"ttl":             cfg.TTL.Seconds(),
 			"max_ttl":         cfg.MaxTTL.Seconds(),
+			"bypass_okta_mfa": cfg.BypassOktaMFA,
 		},
 	}
 	if cfg.BaseURL != "" {
@@ -112,6 +117,10 @@ func (b *backend) pathConfigRead(ctx context.Context, req *logical.Request, d *f
 		resp.Data["production"] = *cfg.Production
 	}
 
+	if cfg.BypassOktaMFA {
+		resp.AddWarning("Okta MFA bypass is configured. In addition to ignoring Okta MFA requests, certain other account statuses will not be seen, such as PASSWORD_EXPIRED. Authentication will succeed in these cases.")
+	}
+
 	return resp, nil
 }
 
@@ -175,6 +184,11 @@ func (b *backend) pathConfigWrite(ctx context.Context, req *logical.Request, d *
 		cfg.Production = nil
 	}
 
+	bypass, ok := d.GetOk("bypass_okta_mfa")
+	if ok {
+		cfg.BypassOktaMFA = bypass.(bool)
+	}
+
 	ttl, ok := d.GetOk("ttl")
 	if ok {
 		cfg.TTL = time.Duration(ttl.(int)) * time.Second
@@ -197,7 +211,13 @@ func (b *backend) pathConfigWrite(ctx context.Context, req *logical.Request, d *
 		return nil, err
 	}
 
-	return nil, nil
+	var resp *logical.Response
+	if cfg.BypassOktaMFA {
+		resp = new(logical.Response)
+		resp.AddWarning("Okta MFA bypass is configured. In addition to ignoring Okta MFA requests, certain other account statuses will not be seen, such as PASSWORD_EXPIRED. Authentication will succeed in these cases.")
+	}
+
+	return resp, nil
 }
 
 func (b *backend) pathConfigExistenceCheck(ctx context.Context, req *logical.Request, d *framework.FieldData) (bool, error) {
@@ -234,6 +254,7 @@ type ConfigEntry struct {
 	Production    *bool         `json:"is_production,omitempty"`
 	TTL           time.Duration `json:"ttl"`
 	MaxTTL        time.Duration `json:"max_ttl"`
+	BypassOktaMFA bool          `json:"bypass_okta_mfa"`
 }
 
 const pathConfigHelp = `

website/source/api/auth/okta/index.html.md

@@ -37,6 +37,9 @@ distinction between the `create` and `update` capabilities inside ACL policies.
 - `ttl` `(string: "")` - Duration after which authentication will be expired.
 - `max_ttl` `(string: "")` - Maximum duration after which authentication will
   be expired.
+- `bypass_okta_mfa` `(bool: false)` - Whether to bypass an Okta MFA request.
+  Useful if using one of Vault's built-in MFA mechanisms, but this will also
+  cause certain other statuses to be ignored, such as `PASSWORD_EXPIRED`.
 
 ### Sample Payload