NAME

RPCSEC_GSS — GSS-API based authentication for RPC

SYNOPSIS

#include <rpc/rpcsec_gss.h>

DESCRIPTION

RPCSEC_GSS is a security mechanism for the RPC protocol. It uses the Generic Security Service API (GSS-API) to establish a security context between a client and a server and to ensure that all subsequent communication between client and server are properly authenticated. Optionally, extra protection can be applied to the connection. The integrity service uses checksums to ensure that all data sent by a peer is received without modification. The privacy service uses encryption to ensure that no third party can access the data for a connection.

To use this system, an application must first use rpc_gss_seccreate() to establish a security context.

DATA STRUCTURES

Data structures used by RPCSEC_GSS appear below.

rpc_gss_service_t

This type defines the types of security service required for rpc_gss_seccreate().

typedef enum {
	rpc_gss_svc_default	= 0,
	rpc_gss_svc_none	= 1,
	rpc_gss_svc_integrity	= 2,
	rpc_gss_svc_privacy	= 3
} rpc_gss_service_t;

rpc_gss_options_ret_t

This structure contains various optional values which are used while creating a security context.

typedef struct {
	int		req_flags;	/* GSS request bits */
	int		time_req;	/* requested lifetime */
	gss_cred_id_t	my_cred;	/* GSS credential */
	gss_channel_bindings_t input_channel_bindings;
} rpc_gss_options_req_t;

rpc_gss_options_ret_t

Various details of the created security context are returned using this structure.

typedef struct {
	int		major_status;
	int		minor_status;
	u_int		rpcsec_version;
	int		ret_flags;
	int		time_req;
	gss_ctx_id_t	gss_context;
	char		actual_mechanism[MAX_GSS_MECH];
} rpc_gss_options_ret_t;

rpc_gss_principal_t

This type is used to refer to an client principal which is represented in GSS-API exported name form (see gss_export_name(3) for more details). Names in this format may be stored in access control lists or compared with other names in exported name form. This structure is returned by rpc_gss_get_principal_name() and is also referenced by the rpc_gss_rawcred_t structure.

typedef struct {
	int		len;
	char		name[1];
} *rpc_gss_principal_t;

rpc_gss_rawcred_t

This structure is used to access the raw credentials associated with a security context.

typedef struct {
	u_int		version;	/* RPC version number */
	const char	*mechanism;	/* security mechanism */
	const char	*qop;		/* quality of protection */
	rpc_gss_principal_t client_principal; /* client name */
	const char	*svc_principal;	/* server name */
	rpc_gss_service_t service;	/* service type */
} rpc_gss_rawcred_t;

rpc_gss_ucred_t

Unix credentials which are derived form the raw credentials, accessed via rpc_gss_getcred().

typedef struct {
	uid_t		uid;		/* user ID */
	gid_t		gid;		/* group ID */
	short		gidlen;
	gid_t		*gidlist;	/* list of groups */
} rpc_gss_ucred_t;

rpc_gss_lock_t

Structure used to enforce a particular QOP and service.

typedef struct {
	bool_t		locked;
	rpc_gss_rawcred_t *raw_cred;
} rpc_gss_lock_t;

rpc_gss_callback_t

Callback structure used by rpc_gss_set_callback().

typedef struct {
	u_int		program;	/* RPC program number */
	u_int		version;	/* RPC version number */
					/* user defined callback */
	bool_t		(*callback)(struct svc_req *req,
				    gss_cred_id_t deleg,
				    gss_ctx_id_t gss_context,
				    rpc_gss_lock_t *lock,
				    void **cookie);
} rpc_gss_callback_t;

rpc_gss_error_t

Structure used to return error information by rpc_gss_get_error().

typedef struct {
	int		rpc_gss_error;
	int		system_error;	/* same as errno */
} rpc_gss_error_t;

/*
 * Values for rpc_gss_error
 */
#define RPC_GSS_ER_SUCCESS	0	/* no error */
#define RPC_GSS_ER_SYSTEMERROR	1	/* system error */

INDEX

rpc_gss_seccreate(3)

Create a new security context

rpc_gss_set_defaults(3)

Set service and quality of protection for a context

rpc_gss_max_data_length(3)

Calculate maximum client message sizes.

rpc_gss_get_error(3)

Get details of the last error

rpc_gss_mech_to_oid(3)

Convert a mechanism name to the corresponding GSS-API oid.

rpc_gss_oid_to_mech(3)

Convert a GSS-API oid to a mechanism name

rpc_gss_qop_to_num(3)

Convert a quality of protection name to the corresponding number

rpc_gss_get_mechanisms(3)

Get a list of security mechanisms.

rpc_gss_get_mech_info(3)

Return extra information about a security mechanism

rpc_gss_get_versions(3)

Return the maximum and minimum supported versions of the RPCSEC_GSS protocol

rpc_gss_is_installed(3)

Query for the presence of a particular security mechanism

rpc_gss_set_svc_name(3)

Set the name of a service principal which matches a given RPC program plus version pair

rpc_gss_getcred(3)

Get credential details for the security context of an RPC request

rpc_gss_set_callback(3)

Install a callback routine which is called on the server when new security contexts are created

rpc_gss_get_principal_name(3)

Create a client principal name from various strings

rpc_gss_svc_max_data_length(3)

Calculate maximum server message sizes.

AVAILABILITY

These functions are part of libtirpc.

SEE ALSO

rpc(3), gssapi(3)

AUTHORS

This manual page was written by Doug Rabson ⟨dfr@FreeBSD.org⟩.