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sia_ses_init(3) Library Functions Manual sia_ses_init(3) NAME sia_ses_init, sia_ses_authent, sia_ses_suauthent, sia_ses_reauthent, sia_ses_estab, sia_ses_launch, sia_ses_release - SIA session routines (Security Integration Architecture) LIBRARY Standard C library (libc.so and libc.a) SYNOPSIS #include <sia.h> #include <siad.h> int sia_ses_init( SIAENTITY ** entityhdl, int argc, char **argv, char *hostname, char *username, char *ttyname, int can_collect_input, char *gssapi); int sia_ses_authent( int (*collect)(), char *passkey, SIAENTITY *entityhdl); int sia_ses_suauthent( int (*collect)(), SIAENTITY *entityhdl); int sia_ses_reauthent( int (*collect)(), SIAENTITY *entityhdl); int sia_ses_estab( int (*collect)(), SIAENTITY *entityhdl); int sia_ses_launch( int (*collect)(), SIAENTITY *entityhdl); int sia_ses_release( SIAENTITY **entityhdl); PARAMETERS argc and argv The argc and argv parameters are used by the underlying se- curity mechanisms for things like generating audit records and initializing database accesses. There should always be at least one argument argv[0] which contains the name of the command or utility issuing a session initialization. These parameters are read only. hostname The hostname parameter is used to determine if the session is being requested by a remote system. If the request is from a remote system, the hostname parameter points to a string containing the remote host information. If informa- tion about the requesting remote user is available, the in- formation is in the form "node::user" for DECnet or "user@host" for IP. If the remote user information is not available, the information is the remote "host". For local requests, this parameter is passed as a NULL pointer. username The username parameter is be set to point to the name or string representing the requesting user if this information is available. Otherwise this parameter is set to NULL. This parameter is read only. ttyname The ttyname parameter is set to point to the name or string representing the requesting or active tty if this informa- tion is available. Otherwise this parameter is set to NULL. This parameter is read only. can_collect_input The can_collect_input parameter specifies whether the col- lection of input is allowed during this session. A "1" means yes and "0" means no. This parameter is read only. gssapi The gssapi pointer is for future expansion to utilize gss_api datatypes. It is not currently used and should be set to NULL. This parameter is currently read only. collect The collect parameter is a pointer to an SIA collection routine. If this pointer is NULL, no collection is possi- ble. If the pointer is not NULL and the can_collect_input parameter entered during the sia_ses_init() call was zero, then this collection routine cannot be used to prompt for input but can be used to display warnings or error mes- sages. This parameter is read only. Further input on SIA collection routines is available from the interface specifications in /usr/include/{sia,siad}.h. entityhdl The entityhdl parameter points to the SIAENTITY structure that was allocated and setup by the previous sia_ses_init() call. Values in the SIAENTITY structure may be changed by the sia_* routines. passkey The passkey parameter provides a precollected password to the authentication routine. Set this parameter to NULL if no password has been precollected. This parameter is read only. DESCRIPTION sia_ses_init() The sia_ses_init() routine initializes SIA sessions. The routine allo- cates an entity handle structure and initializes various values in that structure. It must be called before any of the other SIA session pro- cessing routines. sia_ses_reauthent() The sia_ses_reauthent() routine is used to revalidate a user's pass- word. It is associated with applications that require that the user be reauthenticated. Such applications are the typical terminal or session locking applications. This call must be preceded by a call to sia_ses_init() and followed by a call to sia_ses_release(). sia_ses_release() The sia_ses_release() routine is called at the end of the session pro- cessing to release any resources associated with the session startup processing, including the SIAENTITY structure. After calling the sia_ses_release() routine, do the setuid and then exec the program to start the actual new process running as the session user ID. sia_ses_authent() The sia_ses_authent() routine is called to authenticate an entity. Since this routine may require parameter collection, a collect routine pointer is provided by the calling application. It is also possible that the password has been pre-collected by the application (such as, ftp). The passkey parameter allows the application to provide a pass- word to the security mechanisms. Providing a passkey is not sufficient to keep the underlying mechanisms from trying to prompt for additional information. The sia_ses_init() routine must be called before calling this routine. sia_ses_suauthent() The sia_ses_suauthent() routine processes the su command. Since the processing of the su command is viewed as special and may require an alternative configuration from the normal sia_ses_authent() routine, it has been made a separate SIA capability. Like the sia_ses_authent() routine sia_ses_suauthent is preceded by a call to sia_ses_init() and followed by a call to sia_ses_release(). sia_ses_estab() The sia_ses_estab() routine is called to establish context for a ses- sion that is already checked or authenticated. This routine checks sys- tem or mechanism wide parameters such as licensing or resource limita- tions. The sia_ses_estab() routine also collects the complete set of information or context required to launch a session. However, for a login model the environment processing (clearenv() and setenv()) must still be done. Copy any HOME or SHELL strings from the SIAENTITY structure because the final call to sia_ses_release() will free the en- tire SIAENTITY structure. If the sia_ses_estab() routine fails, sia_ses_release() is automatically called. sia_ses_launch() The sia_ses_launch() routine is called to do the final processing of a session before the actual start of the session by the application. This processing usually consists of the logging or auditing the session startup and any tty conditioning which may be required. Not all secu- rity mechanisms may require processing at this time. Generally, the lo- cal mechanism is required to do the launch processing. If the sia_ses_launch() routine fails, sia_ses_release() is automatically called. On the return from sia_ses_launch(), the effective UID (EUID) has been set to the UID of the user for this session. Generally, a setreuid(ge- teuid(),geteuid()) follows this return setting both the real user ID (RUID) and effective user ID (EUID) to the effective user ID (EUID). The remaining processing is utility dependent. All the users group memberships are set using initgroups(). RETURN VALUES The sia_ses_*() routines return SIASUCCESS when the are successful and SIAFAIL when they are not successful. ERRORS The errno value is not (normally) set explicitly by sia_* routines. The errno values are those returned from the dynamic loader interface, from dependent (siad_*) routines, or from malloc. Possible errors in- clude resource constraints (no memory) and various authentication fail- ures. FILES /etc/passwd /etc/group /etc/sia/matrix.conf RELATED INFORMATION initgroups(3), siad_ses_init(3), matrix.conf(4) Security delim off sia_ses_init(3)