SASL

SASL secure transport layer. More...

Typedefs
typedef struct pn_sasl_t	pn_sasl_t
	The SASL layer is responsible for establishing an authenticated and/or encrypted tunnel over which AMQP frames are passed between peers.

Enumerations
enum	pn_sasl_outcome_t {   PN_SASL_NONE , PN_SASL_OK , PN_SASL_AUTH , PN_SASL_SYS ,   PN_SASL_PERM , PN_SASL_TEMP }
	The result of the SASL negotiation. More...

Functions
pn_sasl_t *	pn_sasl (pn_transport_t *transport)
	Construct an Authentication and Security Layer object.
bool	pn_sasl_extended (void)
	Do we support extended SASL negotiation.
void	pn_sasl_done (pn_sasl_t *sasl, pn_sasl_outcome_t outcome)
	Deprecated - Do not use.
pn_sasl_outcome_t	pn_sasl_outcome (pn_sasl_t *sasl)
	Retrieve the outcome of SASL negotiation.
const char *	pn_sasl_get_user (pn_sasl_t *sasl)
	Retrieve the authenticated user.
const char *	pn_sasl_get_authorization (pn_sasl_t *sasl)
	Retrieve the authorization id.
const char *	pn_sasl_get_mech (pn_sasl_t *sasl)
	Return the selected SASL mechanism.
void	pn_sasl_allowed_mechs (pn_sasl_t *sasl, const char *mechs)
	SASL mechanisms that are to be considered for authentication.
void	pn_sasl_set_allow_insecure_mechs (pn_sasl_t *sasl, bool insecure)
	Boolean to allow use of clear text authentication mechanisms.
bool	pn_sasl_get_allow_insecure_mechs (pn_sasl_t *sasl)
	Return the current value for allow_insecure_mechs.
void	pn_sasl_config_name (pn_sasl_t *sasl, const char *name)
	Set the sasl configuration name.
void	pn_sasl_config_path (pn_sasl_t *sasl, const char *path)
	Set the sasl configuration path.

Detailed Description

SASL secure transport layer.

Typedef Documentation

pn_sasl_t

typedef struct pn_sasl_t pn_sasl_t

The SASL layer is responsible for establishing an authenticated and/or encrypted tunnel over which AMQP frames are passed between peers.

The peer acting as the SASL Client must provide authentication credentials. The peer acting as the SASL Server must provide authentication against the received credentials.

Enumeration Type Documentation

pn_sasl_outcome_t

enum pn_sasl_outcome_t

The result of the SASL negotiation.

Enumerator
PN_SASL_OK	negotiation not completed
PN_SASL_AUTH	authentication succeeded
PN_SASL_SYS	failed due to bad credentials
PN_SASL_PERM	failed due to a system error
PN_SASL_TEMP	failed due to unrecoverable error

Function Documentation

pn_sasl()

pn_sasl_t * pn_sasl

(

pn_transport_t *

transport

)

Construct an Authentication and Security Layer object.

This will return the SASL layer object for the supplied transport object. If there is currently no SASL layer one will be created.

On the client side of an AMQP connection this will have the effect of ensuring that the AMQP SASL layer is used for that connection.

Note

For incoming connections you must call pn_transport_set_server() before pn_sasl() in order to set up a server SASL configuration.

Returns

an object representing the SASL layer.

Examples

broker.c, and direct.c.

pn_sasl_extended()

bool pn_sasl_extended

(

void

)

Do we support extended SASL negotiation.

Do we support extended SASL negotiation? All implementations of Proton support ANONYMOUS and EXTERNAL on both client and server sides and PLAIN on the client side.

Extended SASL implementations use an external library (Cyrus SASL) to support other mechanisms beyond these basic ones.

Returns

true if we support extended SASL negotiation, false if we only support basic negotiation.

pn_sasl_done()

void pn_sasl_done	(	pn_sasl_t *	sasl,
		pn_sasl_outcome_t	outcome
	)

Deprecated - Do not use.

There is no correct way to use this API.

Set the outcome of SASL negotiation

Used by the server to set the result of the negotiation process.

pn_sasl_get_user()

const char * pn_sasl_get_user

(

pn_sasl_t *

sasl

)

Retrieve the authenticated user.

This is usually used at the the server end to find the name of the authenticated user. On the client it will merely return whatever user was passed in to the pn_transport_set_user_password() API.

If pn_sasl_outcome() returns a value other than PN_SASL_OK, then there will be no user to return. The returned value is only reliable after the PN_TRANSPORT_AUTHENTICATED event has been received.

Parameters

[in]

sasl

the sasl layer

Returns

If the SASL layer was not negotiated then 0 is returned If the ANONYMOUS mechanism is used then the user will be "anonymous" Otherwise a string containing the user is returned.

pn_sasl_get_authorization()

const char * pn_sasl_get_authorization

(

pn_sasl_t *

sasl

)

Retrieve the authorization id.

This is usually used at the the server end to find the name of the requested authorization id. On the client it will merely return whatever was passed in to the pn_transport_set_authorization() API.

If pn_sasl_outcome() returns a value other than PN_SASL_OK, then there will be no user to return. The returned value is only reliable after the PN_TRANSPORT_AUTHENTICATED event has been received.

Parameters

[in]

sasl

the sasl layer

Returns

If the SASL layer was not negotiated then 0 is returned If the ANONYMOUS mechanism is used then 0 is returned If no authorization id was requested then 0 is returned Otherwise a string containing the requested authorization id is returned.

pn_sasl_get_mech()

const char * pn_sasl_get_mech

(

pn_sasl_t *

sasl

)

Return the selected SASL mechanism.

The returned value is only reliable after the PN_TRANSPORT_AUTHENTICATED event has been received.

Parameters

[in]

sasl

the SASL layer

Returns

The authentication mechanism selected by the SASL layer

pn_sasl_allowed_mechs()

void pn_sasl_allowed_mechs	(	pn_sasl_t *	sasl,
		const char *	mechs
	)

SASL mechanisms that are to be considered for authentication.

This can be used on either the client or the server to restrict the SASL mechanisms that may be used to the mechanisms on the list.

Note

By default the GSSAPI and GSS-SPNEGO mechanisms are not enabled for clients. This is because these mechanisms have the problematic behaviour of 'capturing' the client whenever they are installed so that they will be used by the client if offered by the server even if the client can't successfully authenticate this way. This can lead to some very hard to debug failures.

The GSSAPI or GSS-SPNEGO mechanisms need to be explicitly enabled if they are required (together with any other required mechanisms).

Parameters

[in]	sasl	the SASL layer
[in]	mechs	space separated list of mechanisms that are allowed for authentication

Examples

broker.c, and direct.c.

pn_sasl_set_allow_insecure_mechs()

void pn_sasl_set_allow_insecure_mechs	(	pn_sasl_t *	sasl,
		bool	insecure
	)

Boolean to allow use of clear text authentication mechanisms.

By default the SASL layer is configured not to allow mechanisms that disclose the clear text of the password over an unencrypted AMQP connection. This specifically will disallow the use of the PLAIN mechanism without using SSL encryption.

This default is to avoid disclosing password information accidentally over an insecure network.

If you actually wish to use a clear text password unencrypted then you can use this API to set allow_insecure_mechs to true.

Parameters

[in]	sasl	the SASL layer
[in]	insecure	set this to true to allow unencrypted PLAIN authentication.

pn_sasl_get_allow_insecure_mechs()

bool pn_sasl_get_allow_insecure_mechs

(

pn_sasl_t *

sasl

)

Return the current value for allow_insecure_mechs.

Parameters

[in]

sasl

the SASL layer

pn_sasl_config_name()

void pn_sasl_config_name	(	pn_sasl_t *	sasl,
		const char *	name
	)

Set the sasl configuration name.

This is used to construct the SASL configuration filename. In the current implementation it ".conf" is added to the name and the file is looked for in the configuration directory.

If not set it will default to "proton-server" for a sasl server and "proton-client" for a client.

Parameters

[in]	sasl	the SASL layer
[in]	name	the configuration name

pn_sasl_config_path()

void pn_sasl_config_path	(	pn_sasl_t *	sasl,
		const char *	path
	)

Set the sasl configuration path.

This is used to tell SASL where to look for the configuration file. In the current implementation it can be a colon separated list of directories.

The environment variable PN_SASL_CONFIG_PATH can also be used to set this path, but if both methods are used then this pn_sasl_config_path() will take precedence.

If not set the underlying implementation default will be used. for a client.

Parameters

[in]	sasl	the SASL layer
[in]	path	the configuration path