OTPServer Component
Properties Methods Events Config Settings Errors
The OTPServer component checks the validity of one-time passwords.
Syntax
nsoftware.SecureBlackbox.Otpserver
Remarks
A One-Time Password (OTP) is a password that is valid for only one session or transaction. OTPs were designed to overcome the weaknesses of traditional static passwords such as vulnerability to replay attacks. The OTPServer component can check the validity of HMAC-Based One-Time Passwords (HOTP) and Time-Based One-Time Passwords (TOTP).
Property List
The following is the full list of the properties of the component with short descriptions. Click on the links for further details.
Method List
The following is the full list of the methods of the component with short descriptions. Click on the links for further details.
Config | Sets or retrieves a configuration setting. |
DoAction | Performs an additional action. |
IsHOTPPasswordValid | Validates a hash-based one-time password. |
IsPasswordValid | Validates an OTP password for a user. |
IsTOTPPasswordValid | Validates a time-based one-time password. |
Event List
The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.
Error | Information about errors during one-time password (OTP) processing. |
Notification | This event notifies the application about an underlying control flow event. |
Config Settings
The following is a list of config settings for the component with short descriptions. Click on the links for further details.
BaseTime | . |
Delta | . |
CheckKeyIntegrityBeforeUse | Enables or disable private key integrity check before use. |
CookieCaching | Specifies whether a cookie cache should be used for HTTP(S) transports. |
Cookies | Gets or sets local cookies for the component. |
DefDeriveKeyIterations | Specifies the default key derivation algorithm iteration count. |
EnableClientSideSSLFFDHE | Enables or disables finite field DHE key exchange support in TLS clients. |
GlobalCookies | Gets or sets global cookies for all the HTTP transports. |
HttpUserAgent | Specifies the user agent name to be used by all HTTP clients. |
LogDestination | Specifies the debug log destination. |
LogDetails | Specifies the debug log details to dump. |
LogFile | Specifies the debug log filename. |
LogFilters | Specifies the debug log filters. |
LogFlushMode | Specifies the log flush mode. |
LogLevel | Specifies the debug log level. |
LogMaxEventCount | Specifies the maximum number of events to cache before further action is taken. |
LogRotationMode | Specifies the log rotation mode. |
MaxASN1BufferLength | Specifies the maximal allowed length for ASN.1 primitive tag data. |
MaxASN1TreeDepth | Specifies the maximal depth for processed ASN.1 trees. |
OCSPHashAlgorithm | Specifies the hash algorithm to be used to identify certificates in OCSP requests. |
StaticDNS | Specifies whether static DNS rules should be used. |
StaticIPAddress[domain] | Gets or sets an IP address for the specified domain name. |
StaticIPAddresses | Gets or sets all the static DNS rules. |
Tag | Allows to store any custom data. |
TLSSessionGroup | Specifies the group name of TLS sessions to be used for session resumption. |
TLSSessionLifetime | Specifies lifetime in seconds of the cached TLS session. |
TLSSessionPurgeInterval | Specifies how often the session cache should remove the expired TLS sessions. |
UseOwnDNSResolver | Specifies whether the client components should use own DNS resolver. |
UseSharedSystemStorages | Specifies whether the validation engine should use a global per-process copy of the system certificate stores. |
UseSystemOAEPAndPSS | Enforces or disables the use of system-driven RSA OAEP and PSS computations. |
UseSystemRandom | Enables or disables the use of the OS PRNG. |
FIPSMode Property (OTPServer Component)
Reserved.
Syntax
Default Value
False
Remarks
This property is reserved for future use.
Users Property (OTPServer Component)
A database of users containing all the per-user password settings.
Syntax
public UserAccountList Users { get; }
Public Property Users As UserAccountList
Remarks
Use this property to provide a list of known users to the OTP server.
This property is not available at design time.
Please refer to the UserAccount type for a complete list of fields.Config Method (OTPServer Component)
Sets or retrieves a configuration setting.
Syntax
Remarks
Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.
These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.
To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).
To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.
DoAction Method (OTPServer Component)
Performs an additional action.
Syntax
Remarks
DoAction is a generic method available in every component. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.
The unique identifier (case insensitive) of the action is provided in the ActionID parameter.
ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....
IsHOTPPasswordValid Method (OTPServer Component)
Validates a hash-based one-time password.
Syntax
Remarks
Use this method to validate a hash-based one-time password (HOTP) by using explicit HOTP parameters. For this method to work, no user details need to be provided in Users collection.
IsPasswordValid Method (OTPServer Component)
Validates an OTP password for a user.
Syntax
Remarks
Use this method to check a one-time Password for a user specified by UserID. The known users' details need to be provided in Users list.
IsTOTPPasswordValid Method (OTPServer Component)
Validates a time-based one-time password.
Syntax
Remarks
Use this method to validate a time-based one-time password (TOTP) by using explicit TOTP parameters. For this method to work, no user details need to be provided in Users collection.
Supported hash algorithms:
SB_MAC_ALGORITHM_HMAC_SHA1 | SHA1 | |
SB_MAC_ALGORITHM_HMAC_SHA256 | SHA256 | |
SB_MAC_ALGORITHM_HMAC_SHA512 | SHA512 |
Error Event (OTPServer Component)
Information about errors during one-time password (OTP) processing.
Syntax
public event OnErrorHandler OnError; public delegate void OnErrorHandler(object sender, OtpserverErrorEventArgs e); public class OtpserverErrorEventArgs : EventArgs { public int ErrorCode { get; } public string Description { get; } }
Public Event OnError As OnErrorHandler Public Delegate Sub OnErrorHandler(sender As Object, e As OtpserverErrorEventArgs) Public Class OtpserverErrorEventArgs Inherits EventArgs Public ReadOnly Property ErrorCode As Integer Public ReadOnly Property Description As String End Class
Remarks
This event is fired in case of exceptional conditions during OTP checks.
ErrorCode contains an error code and Description contains a textual description of the error.
Notification Event (OTPServer Component)
This event notifies the application about an underlying control flow event.
Syntax
public event OnNotificationHandler OnNotification; public delegate void OnNotificationHandler(object sender, OtpserverNotificationEventArgs e); public class OtpserverNotificationEventArgs : EventArgs { public string EventID { get; } public string EventParam { get; } }
Public Event OnNotification As OnNotificationHandler Public Delegate Sub OnNotificationHandler(sender As Object, e As OtpserverNotificationEventArgs) Public Class OtpserverNotificationEventArgs Inherits EventArgs Public ReadOnly Property EventID As String Public ReadOnly Property EventParam As String End Class
Remarks
The component fires this event to let the application know about some event, occurrence, or milestone in the component. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.
The unique identifier of the event is provided in the EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the component, the exact action it is performing, or the document being processed, one or both may be omitted.
UserAccount Type
A container for user account information.
Remarks
UserAccount objects are used to store user account information, such as logins and passwords.
Fields
AssociatedData
byte[]
Default Value: ""
Contains the user's Associated Data when SSH AEAD (Authenticated Encryption with Associated Data) algorithm is used.
BasePath
string
Default Value: ""
Base path for this user in the server's file system.
Cert
byte[]
Default Value: ""
Contains the user's certificate.
Data
string
Default Value: ""
Contains uninterpreted user-defined data that should be associated with the user account, such as comments or custom settings.
HashAlgorithm
string
Default Value: ""
Specifies the hash algorithm used to generate TOTP (Time-based One-Time Passwords) passwords for this user. Three HMAC algorithms are supported, with SHA-1, SHA-256, and SHA-512 digests:
SB_MAC_ALGORITHM_HMAC_SHA1 | SHA1 | |
SB_MAC_ALGORITHM_HMAC_SHA256 | SHA256 | |
SB_MAC_ALGORITHM_HMAC_SHA512 | SHA512 |
IncomingSpeedLimit
int
Default Value: 0
Specifies the incoming speed limit for this user. The value of 0 (zero) means "no limitation".
OtpAlgorithm
OTPAlgorithms
Default Value: 0
The algorithm used to generate one-time passwords (OTP) for this user, either HOTP (Hash-based OTP) or TOTP (Time-based OTP). In the former case, a value of a dedicated counter is used to generate a unique password, while in the latter the password is generated on the basis of the current time value.
oaHmac | 0 | |
oaTime | 1 |
OtpValue
int
Default Value: 0
The user's time interval (TOTP) or Counter (HOTP).
OutgoingSpeedLimit
int
Default Value: 0
Specifies the outgoing speed limit for this user. The value of 0 (zero) means "no limitation".
Password
string
Default Value: ""
The user's authentication password.
PasswordLen
int
Default Value: 0
Specifies the length of the user's OTP password.
SharedSecret
byte[]
Default Value: ""
Contains the user's secret key, which is essentially a shared secret between the client and server.
Shared secrets can be used in TLS-driven protocols, as well as in OTP (where it is called a 'key secret') for generating one-time passwords on one side, and validate them on the other.
SSHKey
byte[]
Default Value: ""
Contains the user's SSH key.
Username
string
Default Value: ""
The registered name (login) of the user.
Constructors
public UserAccount();
Public UserAccount()
Creates a new UserAccount object.
Config Settings (OTPServer Component)
The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.OTPServer Config Settings
Defines the Time-based OTP (TOTP) server's base time.
Specifies the resynchronization limit. This property is used to overcome the asynchronicity between the one-time password (OTP) client and server. For HOTP servers (HMAC-based OTP, RFC 4226), Delta defines the maximum possible deviation of the client's counter value. For TOTP servers (Time-based OTP, RFC 6238), Delta contains the maximum number of time steps the client can be out of synch.
Base Config Settings
This global property enables or disables private key material check before each signing operation. This slows down performance a bit, but prevents a selection of attacks on RSA keys where keys with unknown origins are used.
You can switch this property off to improve performance if your project only uses known, good private keys.
Set this property to enable or disable cookies caching for the component.
Supported values are:
off | No caching (default) | |
local | Local caching | |
global | Global caching |
Use this property to get cookies from the internal cookie storage of the component and/or restore them back between application sessions.
This global property sets the default number of iterations for all supported key derivation algorithms. Note that you can provide the required number of iterations by using properties of the relevant key generation component; this global setting is used in scenarios where specific iteration count is not or cannot be provided.
This global property enables or disables support for finite field DHE key exchange methods in TLS clients. FF DHE is a slower algorithm if compared to EC DHE; enabling it may result in slower connections.
This setting only applies to sessions negotiated with TLS version 1.3.
Use this property to get cookies from the GLOBAL cookie storage or restore them back between application sessions. These cookies will be used by all the components that have its CookieCaching property set to "global".
This global setting defines the User-Agent field of the HTTP request provides information about the software that initiates the request. This value will be used by all the HTTP clients including the ones used internally in other components.
Contains a comma-separated list of values that specifies where debug log should be dumped.
Supported values are:
file | File | |
console | Console | |
systemlog | System Log (supported for Android only) | |
debugger | Debugger (supported for VCL for Windows and .Net) |
Contains a comma-separated list of values that specifies which debug log details to dump.
Supported values are:
time | Current time | |
level | Level | |
package | Package name | |
module | Module name | |
class | Class name | |
method | Method name | |
threadid | Thread Id | |
contenttype | Content type | |
content | Content | |
all | All details |
Use this property to provide a path to the log file.
Contains a comma-separated list of value pairs ("name:value") that describe filters.
Supported filter names are:
exclude-package | Exclude a package specified in the value | |
exclude-module | Exclude a module specified in the value | |
exclude-class | Exclude a class specified in the value | |
exclude-method | Exclude a method specified in the value | |
include-package | Include a package specified in the value | |
include-module | Include a module specified in the value | |
include-class | Include a class specified in the value | |
include-method | Include a method specified in the value |
Use this property to set the log flush mode. The following values are defined:
none | No flush (caching only) | |
immediate | Immediate flush (real-time logging) | |
maxcount | Flush cached entries upon reaching LogMaxEventCount entries in the cache. |
Use this property to provide the desired debug log level.
Supported values are:
none | None (by default) | |
fatal | Severe errors that cause premature termination. | |
error | Other runtime errors or unexpected conditions. | |
warning | Use of deprecated APIs, poor use of API, 'almost' errors, other runtime situations that are undesirable or unexpected, but not necessarily "wrong". | |
info | Interesting runtime events (startup/shutdown). | |
debug | Detailed information on flow of through the system. | |
trace | More detailed information. |
Use this property to specify the log event number threshold. This threshold may have different effects, depending on the rotation setting and/or the flush mode.
The default value of this setting is 100.
Use this property to set the log rotation mode. The following values are defined:
none | No rotation | |
deleteolder | Delete older entries from the cache upon reaching LogMaxEventCount | |
keepolder | Keep older entries in the cache upon reaching LogMaxEventCount (newer entries are discarded) |
This global property limits the maximal allowed length for ASN.1 tag data for non-content-carrying structures, such as certificates, CRLs, or timestamps. It does not affect structures that can carry content, such as CMS/CAdES messages. This is a security property aiming at preventing DoS attacks.
This global property limits the maximal depth of ASN.1 trees that the component can handle without throwing an error. This is a security property aiming at preventing DoS attacks.
This global setting defines the hash algorithm to use in OCSP requests during chain validation. Some OCSP responders can only use older algorithms, in which case setting this property to SHA1 may be helpful.
Set this property to enable or disable static DNS rules for the component. Works only if UseOwnDNSResolver is set to true.
Supported values are:
none | No static DNS rules (default) | |
local | Local static DNS rules | |
global | Global static DNS rules |
Use this property to get or set an IP address for the specified domain name in the internal (of the component) or global DNS rules storage depending on the StaticDNS value. The type of the IP address (IPv4 or IPv6) is determined automatically. If both addresses are available, they are devided by the | (pipe) character.
Use this property to get static DNS rules from the current rules storage or restore them back between application sessions. If StaticDNS of the component is set to "local", the property returns/restores the rules from/to the internal storage of the component. If StaticDNS of the component is set to "global", the property returns/restores the rules from/to the GLOBAL storage. The rules list is returned and accepted in JSON format.
Use this config property to store any custom data.
Use this property to limit the search of chached TLS sessions to the specified group. Sessions from other groups will be ignored. By default, all sessions are cached with an empty group name and available to all the components.
Use this property to specify how much time the TLS session should be kept in the session cache. After this time, the session expires and will be automatically removed from the cache. Default value is 300 seconds (5 minutes).
Use this property to specify the time interval of purging the expired TLS sessions from the session cache. Default value is 60 seconds (1 minute).
Set this global property to false to force all the client components to use the DNS resolver provided by the target OS instead of using own one.
Set this global property to false to make each validation run use its own copy of system certificate stores.
This global setting defines who is responsible for performing RSA-OAEP and RSA-PSS computations where the private key is stored in a Windows system store and is exportable. If set to true, SBB will delegate the computations to Windows via a CryptoAPI call. Otherwise, it will export the key material and perform the computations using its own OAEP/PSS implementation.
This setting only applies to certificates originating from a Windows system store.
Use this global property to enable or disable the use of operating system-driven pseudorandom number generation.
Trappable Errors (OTPServer Component)
OTPServer Errors
1048577 Invalid parameter value (SB_ERROR_INVALID_PARAMETER) | |
1048578 Component is configured incorrectly (SB_ERROR_INVALID_SETUP) | |
1048579 Operation cannot be executed in the current state (SB_ERROR_INVALID_STATE) | |
1048580 Attempt to set an invalid value to a property (SB_ERROR_INVALID_VALUE) | |
1048581 Certificate does not have its private key loaded (SB_ERROR_NO_PRIVATE_KEY) | |
1048581 Cancelled by the user (SB_ERROR_CANCELLED_BY_USER) | |
25165825 User not found (SB_ERROR_OTP_USER_NOT_FOUND) |