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/*
* Implementation of keytab handling for the wallet client.
*
* Written by Russ Allbery <rra@stanford.edu>
* Copyright 2007, 2008, 2010 Board of Trustees, Leland Stanford Jr. University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/krb5.h>
#include <portable/system.h>
#include <remctl.h>
#include <client/internal.h>
#include <util/concat.h>
#include <util/messages-krb5.h>
#include <util/messages.h>
/*
* Given keytab data as a pointer to memory and a length and the path of a
* second keytab, merge the keys in the memory keytab into the file keytab.
* Currently, this doesn't do any cleanup of old kvnos and doesn't handle
* duplicate kvnos correctly. Dies on any error.
*/
static void
merge_keytab(krb5_context ctx, const char *newfile, const char *file)
{
char *oldfile;
krb5_keytab old = NULL, temp = NULL;
krb5_kt_cursor cursor;
krb5_keytab_entry entry;
krb5_error_code status;
memset(&entry, 0, sizeof(entry));
oldfile = concat("WRFILE:", file, (char *) 0);
status = krb5_kt_resolve(ctx, oldfile, &old);
if (status != 0)
die_krb5(ctx, status, "cannot open keytab %s", file);
free(oldfile);
status = krb5_kt_resolve(ctx, newfile, &temp);
if (status != 0)
die_krb5(ctx, status, "cannot open temporary keytab %s", newfile);
status = krb5_kt_start_seq_get(ctx, temp, &cursor);
if (status != 0)
die_krb5(ctx, status, "cannot read temporary keytab %s", newfile);
while ((status = krb5_kt_next_entry(ctx, temp, &entry, &cursor)) == 0) {
status = krb5_kt_add_entry(ctx, old, &entry);
if (status != 0)
die_krb5(ctx, status, "cannot write to keytab %s", file);
krb5_kt_free_entry(ctx, &entry);
}
if (status != KRB5_KT_END)
die_krb5(ctx, status, "error reading temporary keytab %s", newfile);
krb5_kt_end_seq_get(ctx, temp, &cursor);
if (old != NULL)
krb5_kt_close(ctx, old);
if (temp != NULL)
krb5_kt_close(ctx, temp);
}
/*
* Given a remctl object, the Kerberos context, the name of a keytab object,
* and a file name, call the correct wallet commands to download a keytab and
* write it to that file. Returns the setatus or 255 on an internal error.
*/
int
get_keytab(struct remctl *r, krb5_context ctx, const char *type,
const char *name, const char *file, const char *srvtab)
{
const char *command[5];
char *tempfile;
char *data = NULL;
size_t length = 0;
int status;
command[0] = type;
command[1] = "get";
command[2] = "keytab";
command[3] = name;
command[4] = NULL;
status = run_command(r, command, &data, &length);
if (status != 0)
return status;
if (data == NULL) {
warn("no data returned by wallet server");
return 255;
}
if (access(file, F_OK) == 0) {
tempfile = concat(file, ".new", (char *) 0);
overwrite_file(tempfile, data, length);
if (srvtab != NULL)
write_srvtab(ctx, srvtab, name, tempfile);
merge_keytab(ctx, tempfile, file);
if (unlink(tempfile) < 0)
sysdie("unlink of temporary keytab file %s failed", tempfile);
free(tempfile);
} else {
write_file(file, data, length);
if (srvtab != NULL)
write_srvtab(ctx, srvtab, name, file);
}
return 0;
}
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