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/*
* Command-line access to the krb5-sync kadmind plugin.
*
* This program provides command-line access to the functionality of the
* krb5-sync kadmind plugin. Using it, one can push password changes or
* enabled/disabled status according to the same configuration used by the
* plugin. It's primarily intended for testing, but can also be used to
* synchronize changes when the plugin previously failed for some reason.
*
* Written by Russ Allbery <eagle@eyrie.org>
* Based on code developed by Derrick Brashear and Ken Hornstein of Sine
* Nomine Associates, on behalf of Stanford University
* Copyright 2006, 2007, 2010, 2012, 2013
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/krb5.h>
#include <portable/system.h>
#include <errno.h>
#include <syslog.h>
#include <plugin/internal.h>
#include <util/messages-krb5.h>
#include <util/messages.h>
/*
* Change a password in Active Directory. Print a success message if we were
* successful, and exit with an error message if we weren't.
*/
static void
ad_password(kadm5_hook_modinfo *config, krb5_context ctx,
krb5_principal principal, char *password, const char *user)
{
krb5_error_code code;
code = sync_ad_chpass(config, ctx, principal, password);
if (code != 0)
die_krb5(ctx, code, "AD password change for %s failed", user);
notice("AD password change for %s succeeded", user);
}
/*
* Change the account status in Active Directory. Print a success message if
* we were successful, and exit with an error message if we weren't.
*/
static void
ad_status(kadm5_hook_modinfo *config, krb5_context ctx,
krb5_principal principal, bool enable, const char *user)
{
krb5_error_code code;
code = sync_ad_status(config, ctx, principal, enable);
if (code != 0)
die_krb5(ctx, code, "AD status change for %s failed", user);
notice("AD status change for %s succeeded", user);
}
/*
* Read a line from a queue file, making sure we got a complete line and
* cutting off the trailing newline. Doesn't return on error.
*/
static void
read_line(FILE *file, const char *filename, char *buffer, size_t bufsiz)
{
if (fgets(buffer, bufsiz, file) == NULL)
sysdie("cannot read from queue file %s", filename);
if (buffer[strlen(buffer) - 1] != '\n')
die("line too long in queue file %s", filename);
buffer[strlen(buffer) - 1] = '\0';
}
/*
* Read a queue file and take appropriate action based on its contents. The
* format is:
*
* <principal>
* ad
* enable | disable | password
* [<password>]
*
* The actions are the same as from the command-line switches, except that
* passwords are changed separately in AFS and AD. enable and disable are not
* supported for AFS.
*/
static void
process_queue_file(kadm5_hook_modinfo *config, krb5_context ctx,
const char *filename)
{
FILE *queue;
char buffer[BUFSIZ];
char *user;
krb5_principal principal;
krb5_error_code ret;
bool ad = false;
bool enable = false;
bool disable = false;
bool password = false;
/* Open the queue file. */
queue = fopen(filename, "r");
if (queue == NULL)
sysdie("cannot open queue file %s", filename);
/* Get user and convert into a principal. */
read_line(queue, filename, buffer, sizeof(buffer));
user = strdup(buffer);
ret = krb5_parse_name(ctx, buffer, &principal);
if (ret != 0)
die_krb5(ctx, ret, "cannot parse user %s into principal", buffer);
/* Get function. */
read_line(queue, filename, buffer, sizeof(buffer));
if (strcmp(buffer, "ad") == 0)
ad = true;
else
die("unknown target system %s in queue file %s", buffer, filename);
read_line(queue, filename, buffer, sizeof(buffer));
if (strcmp(buffer, "enable") == 0)
enable = true;
else if (strcmp(buffer, "disable") == 0)
disable = true;
else if (strcmp(buffer, "password") == 0)
password = true;
else
die("unknown action %s in queue file %s", buffer, filename);
/* Perform the appropriate action. */
if (password) {
read_line(queue, filename, buffer, sizeof(buffer));
if (ad)
ad_password(config, ctx, principal, buffer, user);
} else if (enable || disable) {
ad_status(config, ctx, principal, enable, user);
}
/* If we got here, we were successful. Close the file and delete it. */
fclose(queue);
if (unlink(filename) != 0)
sysdie("unable to unlink queue file %s", filename);
free(user);
}
int
main(int argc, char *argv[])
{
int option;
int enable = false;
int disable = false;
char *password = NULL;
char *filename = NULL;
char *user;
kadm5_hook_modinfo *config;
krb5_context ctx;
krb5_error_code code;
krb5_principal principal;
/*
* Actions should be logged to LOG_AUTH to go to the same place as the
* logs from kadmind for easier log analysis.
*/
openlog("krb5-sync", LOG_PID, LOG_AUTH);
message_program_name = "krb5-sync";
/* Parse command-line options. */
while ((option = getopt(argc, argv, "def:p:")) != EOF) {
switch (option) {
case 'd': disable = true; break;
case 'e': enable = true; break;
case 'f': filename = optarg; break;
case 'p': password = optarg; break;
default:
fprintf(stderr, "Usage: krb5-sync [-d | -e] [-p <pass>] <user>\n");
exit(1);
}
}
argc -= optind;
argv += optind;
if (argc != 1 && filename == NULL) {
fprintf(stderr, "Usage: krb5-sync [-d | -e] [-p <pass>] <user>\n");
exit(1);
}
if (argc != 0 && filename != NULL) {
fprintf(stderr, "Usage: krb5-sync -f <file>\n");
exit(1);
}
user = argv[0];
if (enable && disable)
die("cannot specify both -d and -e");
if (!enable && !disable && password == NULL && filename == NULL)
die("no action specified");
if (filename != NULL && (enable || disable || password != NULL))
die("must specify queue file or action, not both");
/* Create a Kerberos context for plugin initialization. */
code = krb5_init_context(&ctx);
if (code != 0)
die_krb5(ctx, code, "cannot initialize Kerberos context");
/* Initialize the plugin. */
code = sync_init(ctx, &config);
if (code != 0)
die_krb5(ctx, code, "plugin initialization failed");
/* Now, do whatever we were supposed to do. */
if (filename != NULL)
process_queue_file(config, ctx, filename);
else {
code = krb5_parse_name(ctx, user, &principal);
if (code != 0)
die_krb5(ctx, code, "cannot parse user %s into principal", user);
if (password != NULL)
ad_password(config, ctx, principal, password, user);
if (enable || disable)
ad_status(config, ctx, principal, enable, user);
}
exit(0);
}
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