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msktpass.cpp
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msktpass.cpp
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/*
*----------------------------------------------------------------------------
*
* msktpass.cpp
*
* (C) 2004-2006 Dan Perry (dperry@pppl.gov)
* (C) 2006 Brian Elliott Finley (finley@anl.gov)
* (C) 2009-2010 Doug Engert (deengert@anl.gov)
* (C) 2010 James Y Knight (foom@fuhm.net)
* (C) 2010-2013 Ken Dreyer <ktdreyer at ktdreyer.com>
* (C) 2012-2017 Mark Proehl <mark at mproehl.net>
* (C) 2012-2017 Olaf Flebbe <of at oflebbe.de>
* (C) 2013-2017 Daniel Kobras <d.kobras at science-computing.de>
*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*-----------------------------------------------------------------------------
*/
#include "msktutil.h"
void init_password(msktutil_flags *flags)
{
if (flags->use_service_account) {
VERBOSE("Wiping the password structure");
} else {
VERBOSE("Wiping the computer password structure");
}
std::fill(flags->password.begin(), flags->password.end(), '\0');
}
int generate_new_password(msktutil_flags *flags)
{
int i;
int curr;
int have_lower = 0;
int have_upper = 0;
int have_symbol = 0;
int have_number = 0;
int chars_used = 0;
FILE *fp;
init_password(flags);
flags->password.resize(PASSWORD_LEN);
fp = fopen("/dev/urandom", "r");
if (!fp) {
error_exit( "failed to open /dev/urandom");
}
if (flags->use_service_account) {
VERBOSE("Generating a new, random password for the service account");
} else {
VERBOSE("Generating a new, random password for the computer account");
}
while (!(have_symbol && have_number && have_lower && have_upper)) {
have_symbol = 0;
have_number = 0;
have_upper = 0;
have_lower = 0;
for (i = 0; i < PASSWORD_LEN; i++) {
curr = 0;
while (curr < 33 || curr > 126) {
if ((curr = getc(fp)) == EOF) {
error_exit("Failed to read from /dev/urandom");
}
curr &= 0x7f;
chars_used++;
}
have_symbol |= (curr >= 33 && curr <= 47);
have_symbol |= (curr >= 91 && curr <= 96);
have_symbol |= (curr >= 123 && curr <= 126);
have_symbol |= (curr >= 58 && curr <= 64);
have_number |= (curr >= 48 && curr <= 57);
have_upper |= (curr >= 65 && curr <= 90);
have_lower |= (curr >= 97 && curr <= 122);
flags->password[i] = (char) curr;
}
}
fclose(fp);
VERBOSE("Characters read from /dev/urandom: %d", chars_used);
return 0;
}
/* Try to set the the new Samba secret to <flags->password>. */
static int set_samba_secret(msktutil_flags *flags)
{
VERBOSE("Setting samba machine trust account password using command: %s",
flags->samba_cmd.c_str());
FILE *pipe;
pipe = popen(flags->samba_cmd.c_str(), "w");
if (pipe == NULL) {
fprintf(stdout,
"Could not execute command: %s\n",
flags->samba_cmd.c_str()
);
return 1;
}
size_t len = flags->password.length();
if (fwrite(flags->password.c_str(), sizeof(char), len, pipe) != len) {
fprintf(stdout,
"Write error passing password to command: %s\n",
flags->samba_cmd.c_str()
);
return 1;
}
int rc = pclose(pipe);
if (rc != 0) {
fprintf(stderr,
"WARNING: Setting samba secret failed with error code %d\n",
rc
);
return 1;
}
VERBOSE("Successfully set samba machine trust account password");
return 0;
}
int set_password(msktutil_flags *flags)
{
int ret;
krb5_data resp_code_string;
krb5_data resp_string;
int response = 0;
/* Zero out these data structures, because we attempt to free them
* below, and sometimes, upon error conditions, the called API
* hasn't set them itself. */
resp_string.data = NULL;
resp_string.length = 0;
resp_code_string.data = NULL;
resp_code_string.length = 0;
if (flags->use_service_account) {
VERBOSE("Attempting to reset service account's password");
} else {
VERBOSE("Attempting to reset computer's password");
}
if (flags->auth_type == AUTH_FROM_USER_CREDS) {
VERBOSE("Try change password using user's ticket cache");
KRB5CCache ccache(KRB5CCache::defaultName());
KRB5Principal principal(flags->sAMAccountName);
ret = krb5_set_password_using_ccache(g_context,
ccache.get(),
const_cast<char*>(flags->password.c_str()),
principal.get(),
&response,
&resp_code_string,
&resp_string);
krb5_free_data_contents(g_context, &resp_string);
if (!ret && response) {
fprintf(stderr,
"Error: Unable to set machine password for %s: (%d) %s\n",
flags->sAMAccountName.c_str(),
response,
(char *) resp_code_string.data);
krb5_free_data_contents(g_context, &resp_code_string);
return response;
}
krb5_free_data_contents(g_context, &resp_code_string);
if (ret) {
if (!response && ret == KRB5KRB_AP_ERR_BADADDR) {
VERBOSE("krb5_set_password_using_ccache: password changed "
"successfully, but sender IP in KRB-PRIV failed "
"validation");
if (!flags->server_behind_nat) {
fprintf(stderr,
"Error: krb5_set_password_using_ccache "
"failed: %s\n",
error_message(ret)
);
return ret;
}
} else {
fprintf(stderr,
"Error: krb5_set_password_using_ccache failed: %s\n",
error_message(ret)
);
return ret;
}
}
} else {
KRB5Creds creds;
/* Use the machine's credentials */
if (flags->auth_type == AUTH_FROM_SAM_KEYTAB ||
flags->auth_type == AUTH_FROM_SAM_UPPERCASE_KEYTAB ||
flags->auth_type == AUTH_FROM_EXPLICIT_KEYTAB ||
flags->auth_type == AUTH_FROM_HOSTNAME_KEYTAB) {
std::string princ_name;
if (flags->auth_type == AUTH_FROM_SAM_KEYTAB) {
princ_name = flags->sAMAccountName;
} else if (flags->auth_type == AUTH_FROM_SAM_UPPERCASE_KEYTAB) {
princ_name = flags->sAMAccountName_uppercase;
} else if (flags->auth_type == AUTH_FROM_EXPLICIT_KEYTAB) {
princ_name = flags->keytab_auth_princ;
} else {
princ_name = "host/" + flags->hostname;
}
VERBOSE("Trying to use keytab for %s to change password",
princ_name.c_str());
KRB5Keytab keytab(flags->keytab_readname);
KRB5Principal principal(princ_name);
KRB5Creds local_creds(principal, keytab, "kadmin/changepw");
creds.move_from(local_creds);
} else if (flags->auth_type == AUTH_FROM_PASSWORD) {
VERBOSE("Trying to use default password for %s to change password",
flags->sAMAccountName.c_str());
KRB5Principal principal(flags->sAMAccountName);
KRB5Creds local_creds(principal,
create_default_machine_password(
flags->sAMAccountName),
"kadmin/changepw");
creds.move_from(local_creds);
} else if ((flags->auth_type == AUTH_FROM_SUPPLIED_PASSWORD) ||
(flags->auth_type == AUTH_FROM_SUPPLIED_EXPIRED_PASSWORD)) {
VERBOSE("Trying to use supplied password for %s to change password",
flags->sAMAccountName.c_str());
KRB5Principal principal(flags->sAMAccountName);
KRB5Creds local_creds(principal,
flags->old_account_password,
"kadmin/changepw");
creds.move_from(local_creds);
} else /* shouldn't happen */
throw Exception("Error: unknown auth_type");
ret = krb5_change_password(g_context,
creds.get(),
const_cast<char*>(flags->password.c_str()),
&response,
&resp_code_string,
&resp_string);
krb5_free_data_contents(g_context, &resp_string);
if (response) {
VERBOSE("krb5_change_password failed using keytab: (%d) %s",
response,
(char *) resp_code_string.data);
krb5_free_data_contents(g_context, &resp_code_string);
return response;
}
krb5_free_data_contents(g_context, &resp_code_string);
if (ret) {
if (!response && ret == KRB5KRB_AP_ERR_BADADDR) {
VERBOSE("krb5_change_password: password changed "
"successfully, but sender IP in KRB-PRIV "
"failed validation");
if (!flags->server_behind_nat) {
fprintf(stderr,
"Error: krb5_change_password failed: %s\n",
error_message(ret)
);
return ret;
}
} else {
fprintf(stderr,
"Error: krb5_change_password failed: %s\n",
error_message(ret)
);
return ret;
}
}
}
VERBOSE("Successfully set password");
if (flags->set_samba_secret) {
/* At this point, we've already set the new password in AD, and there's
* no way to roll back for us because we don't know the old password.
* Therefore, even if we fail to propagate the new password to Samba,
* we still need to carry on, and write out the new keys to the keytab.
* Failing here is not an option, so ignore the return value from
* set_samba_secret(), and proceed normally. (The function has already
* notified on stderr if a failure had occurred.)
*/
(void) set_samba_secret(flags);
}
return 0;
}