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secure_rpc(3NSL)     Networking Services Library Functions    secure_rpc(3NSL)

NAME
       secure_rpc,  authdes_getucred, authdes_seccreate, getnetname, host2net‐
       name, key_decryptsession,  key_encryptsession,  key_gendes,  key_setse‐
       cret,  key_secretkey_is_set, netname2host, netname2user, user2netname -
       library routines for secure remote procedure calls

SYNOPSIS
       cc [ flag... ] file... -lnsl [ library...]
       #include <rpc/rpc.h>
       #include <sys/types.h>
       int authdes_getucred(const struct authdes_cred *adc, uid_t *uidp,
	    gid_t *gidp, short *gidlenp, gid_t *gidlist);

       AUTH *authdes_seccreate(const char *name, const uint_t window,
	    const char *timehost, ckey);

       int getnetname(char name [MAXNETNAMELEN+1]);

       int host2netname(char name [MAXNETNAMELEN+1], const char *host,
	    const char *domain);

       int key_decryptsession(const char *remotename, des_block *deskey);

       int key_encryptsession(const char *remotename, des_block *deskey);

       int key_gendes(des_block *deskey);

       int key_setsecret(const char *key);

       int key_secretkey_is_set(void)

       int netname2host(const char *name, char *host, const int hostlen);

       int netname2user(const char *name, uid_t *uidp, gid_t *gidp, int *gidlenp,
	    gid_t *gidlist [NGRPS]);

       int user2netname(char name [MAXNETNAMELEN+1], const uid_t uid,
	    const char *domain);

DESCRIPTION
       The RPC library functions allow C programs to make procedure  calls  on
       other machines across the network.

       RPC supports various authentication flavors. Among them are:

       AUTH_NONE    No authentication (none).

       AUTH_SYS	    Traditional UNIX-style authentication.

       AUTH_DES	    DES encryption-based authentication.

       The  authdes_getucred() and authdes_seccreate() functions implement the
       AUTH_DES authentication style. The keyserver daemon keyserv(1M) must be
       running	for the AUTH_DES authentication system to work and keylogin(1)
       must have been run. The AUTH_DES style of authentication	 is  discussed
       here.  For  information	about  the  AUTH_NONE  and AUTH_SYS flavors of
       authentication, refer to rpc_clnt_auth(3NSL).  See  rpc(3NSL)  for  the
       definition of the AUTH data structure.

       The  following  functions  documented on this page are MT-Safe. For the
       MT-levels of other authentication styles, see relevant man pages.

       authdes_getucred()	 This is  the  first  of  two  functions  that
				 interface  to	the  RPC secure authentication
				 system	  AUTH_DES.   The   second   is	   the
				 authdes_seccreate()	   function.	   The
				 authdes_getucred() function is	 used  on  the
				 server	 side  to  convert an AUTH_DES creden‐
				 tial, which is operating system  independent,
				 to  an AUTH_SYS credential. The authdes_getu‐
				 cred() function returns 1 if it  succeeds,  0
				 if it fails.

				 The  *uidp  parameter	is  set	 to the user's
				 numerical ID associated with adc.  The	 *gidp
				 parameter  is	set to the numerical ID of the
				 user's group. The *gidlist parameter contains
				 the  numerical	 IDs  of  the  other groups to
				 which the user belongs. The *gidlenp  parame‐
				 ter  is  set  to the number of valid group ID
				 entries specified by the *gidlist parameter.

				 The authdes_getucred() function fails if  the
				 authdes_cred  structure  was created with the
				 netname of a  host.  In  such	a  case,  net‐
				 name2host()  should  be  used to get the host
				 name	from   the   host   netname   in   the
				 authdes_cred structure.

       authdes_seccreate()	 The  second  of  two  AUTH_DES authentication
				 functions, the	 authdes_seccreate()  function
				 is  used  on  the  client  side  to return an
				 authentication handle that enables the use of
				 the  secure  authentication system. The first
				 field, name, specifies the network name  net‐
				 name  of the owner of the server process. The
				 field usually represents a  hostname  derived
				 from  the  host2netname()  utility,  but  the
				 field might also represent a user  name  con‐
				 verted with the user2netname() utility.

				 The   second  field,  window,	specifies  the
				 validity of the client credential in seconds.
				 If   the   difference	in  time  between  the
				 client's clock and the server's clock exceeds
				 window,  the server rejects the client's cre‐
				 dentials and the clock will have to be resyn‐
				 chronized. A small window is more secure than
				 a large one, but choosing too small a	window
				 increases  the frequency of resynchronization
				 due to clock drift.

				 The third parameter, timehost, is the	host's
				 name  and  is	optional. If timehost is NULL,
				 the authentication system  assumes  that  the
				 local	clock is always in sync with the time‐
				 host clock and does  not  attempt  resynchro‐
				 nization. If a timehost is supplied, the sys‐
				 tem consults the remote time service whenever
				 resynchronization  is	required. The timehost
				 parameter is usually the name of the host  on
				 which the server is running.

				 The  final parameter, ckey, is also optional.
				 If ckey is NULL,  the	authentication	system
				 generates a random DES key to be used for the
				 encryption of credentials. If	ckey  is  sup‐
				 plied, it is used for encryption.

				 If   authdes_seccreate()  fails,  it  returns
				 NULL.

       getnetname()		 This function returns the  unique,  operating
				 system	 independent  netname of the caller in
				 the fixed-length  array  name.	 The  function
				 returns 1 if it succeeds and 0 if it fails.

       host2netname()		 This	function  converts  a  domain-specific
				 hostname host to an operating system indepen‐
				 dent  netname.	 The  function returns 1 if it
				 succeeds and 0 if  it	fails.	The  host2net‐
				 name()	 function  is  the inverse of the net‐
				 name2host() function. If the domain is	 NULL,
				 host2netname()	 uses  the default domain name
				 of the machine. If host is NULL, it  defaults
				 to that machine itself. If domain is NULL and
				 host is an NIS name such as  myhost.sun.exam‐
				 ple.com, the host2netname() function uses the
				 domain	 sun.example.com   rather   than   the
				 default domain name of the machine.

       key_decryptsession()	 This  function	 is  an	 interface to the key‐
				 server daemon, which is associated with RPC's
				 secure	   authentication   system   (AUTH_DES
				 authentication). User programs rarely need to
				 call  key_decryptsession()  or the associated
				 functions key_encryptsession(), key_gendes(),
				 and key_setsecret().

				 The  key_decryptsession()  function  takes  a
				 server	 netname  remotename  and  a  DES  key
				 deskey, and decrypts the key by using the the
				 public key of the server and the  secret  key
				 associated  with  the	effective  UID	of the
				 calling  process.  The	  key_decryptsession()
				 function  is  the  inverse of key_encryptses‐
				 sion() function.

       key_encryptsession()	 This function is a keyserver  interface  that
				 takes	a  server netname remotename and a DES
				 key deskey, and encrypts the  key  using  the
				 public	 key  of the the server and the secret
				 key associated with the effective UID of  the
				 calling  process.  If	the keyserver does not
				 have a key registered for the UID,  it	 falls
				 back  to using the secret key for the netname
				 nobody unless this feature has been disabled.
				 See   keyserv(1M).  The  key_encryptsession()
				 function is the  inverse  of  key_decryptses‐
				 sion()	  function.  The  key_encryptsession()
				 function returns 0 if it succeeds, −1	if  it
				 fails.

       key_gendes()		 This  is  a keyserver interface function used
				 to ask the keyserver for a  secure  conversa‐
				 tion  key. Selecting a conversion key at ran‐
				 dom is generally not secure because the  com‐
				 mon  ways  of choosing random numbers are too
				 easy  to  guess.  The	key_gendes()  function
				 returns 0 if it succeeds, −1 if it fails.

       key_setsecret()		 This  is  a keyserver interface function used
				 to set the key for the effective UID  of  the
				 calling  process.  This function returns 0 if
				 it succeeds, −1 if it fails.

       key_secretkey_is_set()	 This is a keyserver interface	function  used
				 to  determine	if  a key has been set for the
				 effective UID of the calling process. If  the
				 keyserver  has a key stored for the effective
				 UID   of    the    calling    process,	   the
				 key_secretkey_is_set()	 function  returns  1.
				 Otherwise it returns 0.

       netname2host()		 This function converts	 an  operating	system
				 independent netname name to a domain-specific
				 hostname host. The hostlen parameter  is  the
				 maximum  size	of  host.  The	netname2host()
				 function returns 1 if it succeeds and 0 if it
				 fails.	 The  function	is  the inverse of the
				 host2netname() function.

       netname2user()		 This function converts	 an  operating	system
				 independent netname to a domain-specific user
				 ID. The netname2user() function returns 1  if
				 it succeeds and 0 if it fails.The function is
				 the inverse of the user2netname() function.

				 The *uidp parameter  is  set  to  the	user's
				 numerical  ID associated with name. The *gidp
				 parameter is set to the numerical ID  of  the
				 user's	 group. The gidlist parameter contains
				 the numerical IDs  of	the  other  groups  to
				 which	the user belongs. The *gidlenp parame‐
				 ter is set to the number of  valid  group  ID
				 entries specified by the gidlist parameter.

       user2netname()		 This	function  converts  a  domain-specific
				 username to an operating  system  independent
				 netname.  The user2netname() function returns
				 1 if it succeeds and 0 if it fails. The func‐
				 tion  is  the inverse of netname2user() func‐
				 tion.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       chkey(1),    keylogin(1),    keyserv(1M),    newkey(1M),	    rpc(3NSL),
       rpc_clnt_auth(3NSL), attributes(5)

SunOS 5.11			  19 Feb 2004		      secure_rpc(3NSL)
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