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KAFS(3) FreeBSD Library Functions Manual KAFS(3)
NAME
k_hasafs, k_hasafs_recheck, k_pioctl, k_unlog, k_setpag,
k_afs_cell_of_file, kafs_set_verbose, kafs_settoken_rxkad, kafs_settoken,
krb_afslog, krb_afslog_uid, kafs_settoken5, krb5_afslog, krb5_afslog_uid
- AFS library
LIBRARY
AFS cache manager access library (libkafs5, -lkafs5)
SYNOPSIS
#include <kafs.h>
int
k_afs_cell_of_file(const char *path, char *cell, int len);
int
k_hasafs(void);
int
k_hasafs_recheck(void);
int
k_pioctl(char *a_path, int o_opcode, struct ViceIoctl *a_paramsP,
int a_followSymlinks);
int
k_setpag(void);
int
k_unlog(void);
void
kafs_set_verbose(void (*func)(void *, const char *, int), void *);
int
kafs_settoken_rxkad(const char *cell, struct ClearToken *token,
void *ticket, size_t ticket_len);
int
kafs_settoken(const char *cell, uid_t uid, CREDENTIALS *c);
krb_afslog(char *cell, char *realm);
int
krb_afslog_uid(char *cell, char *realm, uid_t uid);
krb5_error_code
krb5_afslog_uid(krb5_context context, krb5_ccache id, const char *cell,
krb5_const_realm realm, uid_t uid);
int
kafs_settoken5(const char *cell, uid_t uid, krb5_creds *c);
krb5_error_code
krb5_afslog(krb5_context context, krb5_ccache id, const char *cell,
krb5_const_realm realm);
kafs_set_verbose() set a log function that will be called each time the
kafs library does something important so that the application using
libkafs can output verbose logging. Calling the function
kafs_set_verbose with the function argument set to NULL will stop libkafs
from calling the logging function (if set).
kafs_settoken_rxkad() set rxkad with the token and ticket (that have the
length ticket_len) for a given cell.
kafs_settoken() and kafs_settoken5() work the same way as
kafs_settoken_rxkad() but internally converts the Kerberos 4 or 5
credential to a afs cleartoken and ticket.
krb_afslog(), and krb_afslog_uid() obtains new tokens (and possibly
tickets) for the specified cell and realm. If cell is NULL, the local
cell is used. If realm is NULL, the function tries to guess what realm to
use. Unless you have some good knowledge of what cell or realm to use,
you should pass NULL. krb_afslog() will use the real user-id for the
ViceId field in the token, krb_afslog_uid() will use uid.
krb5_afslog(), and krb5_afslog_uid() are the Kerberos 5 equivalents of
krb_afslog(), and krb_afslog_uid().
krb5_afslog(), kafs_settoken5() can be configured to behave differently
via a krb5_appdefault option afs-use-524 in krb5.conf. Possible values
for afs-use-524 are:
yes use the 524 server in the realm to convert the ticket
no use the Kerberos 5 ticket directly, can be used with if the afs
cell support 2b token.
local, 2b
convert the Kerberos 5 credential to a 2b token locally (the same
work as a 2b 524 server should have done).
Example:
[appdefaults]
SU.SE = { afs-use-524 = local }
PDC.KTH.SE = { afs-use-524 = yes }
afs-use-524 = yes
libkafs will use the libkafs as application name when running the
krb5_appdefault function call.
The (uppercased) cell name is used as the realm to the krb5_appdefault
function.
k_afs_cell_of_file() will in cell return the cell of a specified file, no
more than len characters is put in cell.
k_pioctl() does a pioctl() system call with the specified arguments. This
function is equivalent to lpioctl().
k_setpag() initializes a new PAG.
k_unlog() removes destroys all tokens in the current PAG.
ENVIRONMENT
The following environment variable affect the mode of operation of kafs:
AFS_SYSCALL Normally, kafs will try to figure out the correct system
call(s) that are used by AFS by itself. If it does not
manage to do that, or does it incorrectly, you can set this
variable to the system call number or list of system call
numbers that should be used.
EXAMPLES
The following code from login will obtain a new PAG and tokens for the
local cell and the cell of the users home directory.
if (k_hasafs()) {
char cell[64];
k_setpag();
if(k_afs_cell_of_file(pwd->pw_dir, cell, sizeof(cell)) == 0)
krb_afslog(cell, NULL);
krb_afslog(NULL, NULL);
}
ERRORS
If any of these functions (apart from k_hasafs()) is called without AFS
being present in the kernel, the process will usually (depending on the
operating system) receive a SIGSYS signal.
SEE ALSO
krb5_appdefault(3), krb5.conf(5)
Transarc Corporation, "File Server/Cache Manager Interface", AFS-3
Programmer's Reference, 1991.
FILES
libkafs will search for ThisCell and TheseCells in the following
locations: /usr/vice/etc, /etc/openafs, /var/db/openafs/etc,
/usr/arla/etc, /etc/arla, and /etc/afs
BUGS
AFS_SYSCALL has no effect under AIX.
HEIMDAL May 1, 2006 HEIMDAL