824 lines
19 KiB
C
824 lines
19 KiB
C
/*
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* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <krb5_locl.h>
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RCSID("$Id: changepw.c 21505 2007-07-12 12:28:38Z lha $");
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static void
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str2data (krb5_data *d,
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const char *fmt,
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...) __attribute__ ((format (printf, 2, 3)));
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static void
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str2data (krb5_data *d,
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const char *fmt,
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...)
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{
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va_list args;
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char *str;
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va_start(args, fmt);
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d->length = vasprintf (&str, fmt, args);
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va_end(args);
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d->data = str;
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}
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/*
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* Change password protocol defined by
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* draft-ietf-cat-kerb-chg-password-02.txt
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*
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* Share the response part of the protocol with MS set password
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* (RFC3244)
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*/
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static krb5_error_code
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chgpw_send_request (krb5_context context,
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krb5_auth_context *auth_context,
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krb5_creds *creds,
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krb5_principal targprinc,
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int is_stream,
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int sock,
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const char *passwd,
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const char *host)
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{
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krb5_error_code ret;
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krb5_data ap_req_data;
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krb5_data krb_priv_data;
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krb5_data passwd_data;
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size_t len;
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u_char header[6];
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u_char *p;
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struct iovec iov[3];
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struct msghdr msghdr;
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if (is_stream)
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return KRB5_KPASSWD_MALFORMED;
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if (targprinc &&
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krb5_principal_compare(context, creds->client, targprinc) != TRUE)
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return KRB5_KPASSWD_MALFORMED;
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krb5_data_zero (&ap_req_data);
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ret = krb5_mk_req_extended (context,
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auth_context,
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AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
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NULL, /* in_data */
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creds,
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&ap_req_data);
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if (ret)
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return ret;
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passwd_data.data = rk_UNCONST(passwd);
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passwd_data.length = strlen(passwd);
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krb5_data_zero (&krb_priv_data);
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ret = krb5_mk_priv (context,
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*auth_context,
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&passwd_data,
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&krb_priv_data,
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NULL);
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if (ret)
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goto out2;
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len = 6 + ap_req_data.length + krb_priv_data.length;
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p = header;
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*p++ = (len >> 8) & 0xFF;
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*p++ = (len >> 0) & 0xFF;
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*p++ = 0;
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*p++ = 1;
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*p++ = (ap_req_data.length >> 8) & 0xFF;
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*p++ = (ap_req_data.length >> 0) & 0xFF;
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memset(&msghdr, 0, sizeof(msghdr));
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = iov;
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msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
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#if 0
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msghdr.msg_control = NULL;
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msghdr.msg_controllen = 0;
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#endif
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iov[0].iov_base = (void*)header;
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iov[0].iov_len = 6;
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iov[1].iov_base = ap_req_data.data;
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iov[1].iov_len = ap_req_data.length;
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iov[2].iov_base = krb_priv_data.data;
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iov[2].iov_len = krb_priv_data.length;
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if (sendmsg (sock, &msghdr, 0) < 0) {
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ret = errno;
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krb5_set_error_string(context, "sendmsg %s: %s", host, strerror(ret));
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}
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krb5_data_free (&krb_priv_data);
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out2:
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krb5_data_free (&ap_req_data);
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return ret;
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}
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/*
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* Set password protocol as defined by RFC3244 --
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* Microsoft Windows 2000 Kerberos Change Password and Set Password Protocols
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*/
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static krb5_error_code
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setpw_send_request (krb5_context context,
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krb5_auth_context *auth_context,
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krb5_creds *creds,
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krb5_principal targprinc,
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int is_stream,
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int sock,
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const char *passwd,
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const char *host)
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{
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krb5_error_code ret;
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krb5_data ap_req_data;
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krb5_data krb_priv_data;
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krb5_data pwd_data;
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ChangePasswdDataMS chpw;
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size_t len;
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u_char header[4 + 6];
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u_char *p;
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struct iovec iov[3];
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struct msghdr msghdr;
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krb5_data_zero (&ap_req_data);
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ret = krb5_mk_req_extended (context,
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auth_context,
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AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
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NULL, /* in_data */
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creds,
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&ap_req_data);
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if (ret)
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return ret;
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chpw.newpasswd.length = strlen(passwd);
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chpw.newpasswd.data = rk_UNCONST(passwd);
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if (targprinc) {
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chpw.targname = &targprinc->name;
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chpw.targrealm = &targprinc->realm;
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} else {
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chpw.targname = NULL;
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chpw.targrealm = NULL;
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}
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ASN1_MALLOC_ENCODE(ChangePasswdDataMS, pwd_data.data, pwd_data.length,
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&chpw, &len, ret);
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if (ret) {
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krb5_data_free (&ap_req_data);
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return ret;
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}
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if(pwd_data.length != len)
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krb5_abortx(context, "internal error in ASN.1 encoder");
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ret = krb5_mk_priv (context,
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*auth_context,
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&pwd_data,
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&krb_priv_data,
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NULL);
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if (ret)
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goto out2;
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len = 6 + ap_req_data.length + krb_priv_data.length;
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p = header;
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if (is_stream) {
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_krb5_put_int(p, len, 4);
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p += 4;
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}
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*p++ = (len >> 8) & 0xFF;
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*p++ = (len >> 0) & 0xFF;
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*p++ = 0xff;
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*p++ = 0x80;
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*p++ = (ap_req_data.length >> 8) & 0xFF;
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*p++ = (ap_req_data.length >> 0) & 0xFF;
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memset(&msghdr, 0, sizeof(msghdr));
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = iov;
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msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
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#if 0
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msghdr.msg_control = NULL;
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msghdr.msg_controllen = 0;
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#endif
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iov[0].iov_base = (void*)header;
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if (is_stream)
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iov[0].iov_len = 10;
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else
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iov[0].iov_len = 6;
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iov[1].iov_base = ap_req_data.data;
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iov[1].iov_len = ap_req_data.length;
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iov[2].iov_base = krb_priv_data.data;
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iov[2].iov_len = krb_priv_data.length;
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if (sendmsg (sock, &msghdr, 0) < 0) {
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ret = errno;
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krb5_set_error_string(context, "sendmsg %s: %s", host, strerror(ret));
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}
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krb5_data_free (&krb_priv_data);
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out2:
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krb5_data_free (&ap_req_data);
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krb5_data_free (&pwd_data);
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return ret;
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}
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static krb5_error_code
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process_reply (krb5_context context,
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krb5_auth_context auth_context,
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int is_stream,
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int sock,
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int *result_code,
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krb5_data *result_code_string,
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krb5_data *result_string,
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const char *host)
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{
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krb5_error_code ret;
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u_char reply[1024 * 3];
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ssize_t len;
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uint16_t pkt_len, pkt_ver;
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krb5_data ap_rep_data;
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int save_errno;
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len = 0;
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if (is_stream) {
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while (len < sizeof(reply)) {
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unsigned long size;
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ret = recvfrom (sock, reply + len, sizeof(reply) - len,
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0, NULL, NULL);
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if (ret < 0) {
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save_errno = errno;
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krb5_set_error_string(context, "recvfrom %s: %s",
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host, strerror(save_errno));
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return save_errno;
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} else if (ret == 0) {
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krb5_set_error_string(context, "recvfrom timeout %s", host);
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return 1;
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}
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len += ret;
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if (len < 4)
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continue;
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_krb5_get_int(reply, &size, 4);
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if (size + 4 < len)
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continue;
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memmove(reply, reply + 4, size);
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len = size;
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break;
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}
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if (len == sizeof(reply)) {
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krb5_set_error_string(context, "message too large from %s",
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host);
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return ENOMEM;
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}
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} else {
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ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL);
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if (ret < 0) {
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save_errno = errno;
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krb5_set_error_string(context, "recvfrom %s: %s",
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host, strerror(save_errno));
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return save_errno;
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}
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len = ret;
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}
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if (len < 6) {
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str2data (result_string, "server %s sent to too short message "
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"(%ld bytes)", host, (long)len);
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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pkt_len = (reply[0] << 8) | (reply[1]);
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pkt_ver = (reply[2] << 8) | (reply[3]);
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if ((pkt_len != len) || (reply[1] == 0x7e || reply[1] == 0x5e)) {
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KRB_ERROR error;
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size_t size;
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u_char *p;
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memset(&error, 0, sizeof(error));
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ret = decode_KRB_ERROR(reply, len, &error, &size);
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if (ret)
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return ret;
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if (error.e_data->length < 2) {
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str2data(result_string, "server %s sent too short "
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"e_data to print anything usable", host);
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free_KRB_ERROR(&error);
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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p = error.e_data->data;
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*result_code = (p[0] << 8) | p[1];
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if (error.e_data->length == 2)
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str2data(result_string, "server only sent error code");
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else
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krb5_data_copy (result_string,
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p + 2,
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error.e_data->length - 2);
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free_KRB_ERROR(&error);
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return 0;
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}
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if (pkt_len != len) {
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str2data (result_string, "client: wrong len in reply");
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW) {
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str2data (result_string,
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"client: wrong version number (%d)", pkt_ver);
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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ap_rep_data.data = reply + 6;
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ap_rep_data.length = (reply[4] << 8) | (reply[5]);
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if (reply + len < (u_char *)ap_rep_data.data + ap_rep_data.length) {
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str2data (result_string, "client: wrong AP len in reply");
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*result_code = KRB5_KPASSWD_MALFORMED;
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return 0;
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}
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if (ap_rep_data.length) {
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krb5_ap_rep_enc_part *ap_rep;
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krb5_data priv_data;
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u_char *p;
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priv_data.data = (u_char*)ap_rep_data.data + ap_rep_data.length;
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priv_data.length = len - ap_rep_data.length - 6;
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ret = krb5_rd_rep (context,
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auth_context,
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&ap_rep_data,
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&ap_rep);
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if (ret)
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return ret;
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krb5_free_ap_rep_enc_part (context, ap_rep);
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ret = krb5_rd_priv (context,
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auth_context,
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&priv_data,
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result_code_string,
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NULL);
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if (ret) {
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krb5_data_free (result_code_string);
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return ret;
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}
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if (result_code_string->length < 2) {
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*result_code = KRB5_KPASSWD_MALFORMED;
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str2data (result_string,
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"client: bad length in result");
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return 0;
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}
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p = result_code_string->data;
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*result_code = (p[0] << 8) | p[1];
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krb5_data_copy (result_string,
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(unsigned char*)result_code_string->data + 2,
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result_code_string->length - 2);
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return 0;
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} else {
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KRB_ERROR error;
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size_t size;
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u_char *p;
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ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size);
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if (ret) {
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return ret;
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}
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if (error.e_data->length < 2) {
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krb5_warnx (context, "too short e_data to print anything usable");
|
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return 1; /* XXX */
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}
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p = error.e_data->data;
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*result_code = (p[0] << 8) | p[1];
|
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krb5_data_copy (result_string,
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p + 2,
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error.e_data->length - 2);
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return 0;
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}
|
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}
|
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|
|
|
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/*
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* change the password using the credentials in `creds' (for the
|
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* principal indicated in them) to `newpw', storing the result of
|
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* the operation in `result_*' and an error code or 0.
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*/
|
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|
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typedef krb5_error_code (*kpwd_send_request) (krb5_context,
|
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krb5_auth_context *,
|
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krb5_creds *,
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krb5_principal,
|
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int,
|
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int,
|
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const char *,
|
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const char *);
|
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typedef krb5_error_code (*kpwd_process_reply) (krb5_context,
|
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krb5_auth_context,
|
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int,
|
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int,
|
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int *,
|
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krb5_data *,
|
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krb5_data *,
|
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const char *);
|
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|
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static struct kpwd_proc {
|
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const char *name;
|
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int flags;
|
|
#define SUPPORT_TCP 1
|
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#define SUPPORT_UDP 2
|
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kpwd_send_request send_req;
|
|
kpwd_process_reply process_rep;
|
|
} procs[] = {
|
|
{
|
|
"MS set password",
|
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SUPPORT_TCP|SUPPORT_UDP,
|
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setpw_send_request,
|
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process_reply
|
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},
|
|
{
|
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"change password",
|
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SUPPORT_UDP,
|
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chgpw_send_request,
|
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process_reply
|
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},
|
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{ NULL }
|
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};
|
|
|
|
static struct kpwd_proc *
|
|
find_chpw_proto(const char *name)
|
|
{
|
|
struct kpwd_proc *p;
|
|
for (p = procs; p->name != NULL; p++) {
|
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if (strcmp(p->name, name) == 0)
|
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return p;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
static krb5_error_code
|
|
change_password_loop (krb5_context context,
|
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krb5_creds *creds,
|
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krb5_principal targprinc,
|
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const char *newpw,
|
|
int *result_code,
|
|
krb5_data *result_code_string,
|
|
krb5_data *result_string,
|
|
struct kpwd_proc *proc)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_auth_context auth_context = NULL;
|
|
krb5_krbhst_handle handle = NULL;
|
|
krb5_krbhst_info *hi;
|
|
int sock;
|
|
int i;
|
|
int done = 0;
|
|
krb5_realm realm;
|
|
|
|
if (targprinc)
|
|
realm = targprinc->realm;
|
|
else
|
|
realm = creds->client->realm;
|
|
|
|
ret = krb5_auth_con_init (context, &auth_context);
|
|
if (ret)
|
|
return ret;
|
|
|
|
krb5_auth_con_setflags (context, auth_context,
|
|
KRB5_AUTH_CONTEXT_DO_SEQUENCE);
|
|
|
|
ret = krb5_krbhst_init (context, realm, KRB5_KRBHST_CHANGEPW, &handle);
|
|
if (ret)
|
|
goto out;
|
|
|
|
while (!done && (ret = krb5_krbhst_next(context, handle, &hi)) == 0) {
|
|
struct addrinfo *ai, *a;
|
|
int is_stream;
|
|
|
|
switch (hi->proto) {
|
|
case KRB5_KRBHST_UDP:
|
|
if ((proc->flags & SUPPORT_UDP) == 0)
|
|
continue;
|
|
is_stream = 0;
|
|
break;
|
|
case KRB5_KRBHST_TCP:
|
|
if ((proc->flags & SUPPORT_TCP) == 0)
|
|
continue;
|
|
is_stream = 1;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
|
|
if (ret)
|
|
continue;
|
|
|
|
for (a = ai; !done && a != NULL; a = a->ai_next) {
|
|
int replied = 0;
|
|
|
|
sock = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
|
|
if (sock < 0)
|
|
continue;
|
|
|
|
ret = connect(sock, a->ai_addr, a->ai_addrlen);
|
|
if (ret < 0) {
|
|
close (sock);
|
|
goto out;
|
|
}
|
|
|
|
ret = krb5_auth_con_genaddrs (context, auth_context, sock,
|
|
KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR);
|
|
if (ret) {
|
|
close (sock);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; !done && i < 5; ++i) {
|
|
fd_set fdset;
|
|
struct timeval tv;
|
|
|
|
if (!replied) {
|
|
replied = 0;
|
|
|
|
ret = (*proc->send_req) (context,
|
|
&auth_context,
|
|
creds,
|
|
targprinc,
|
|
is_stream,
|
|
sock,
|
|
newpw,
|
|
hi->hostname);
|
|
if (ret) {
|
|
close(sock);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (sock >= FD_SETSIZE) {
|
|
krb5_set_error_string(context, "fd %d too large", sock);
|
|
ret = ERANGE;
|
|
close (sock);
|
|
goto out;
|
|
}
|
|
|
|
FD_ZERO(&fdset);
|
|
FD_SET(sock, &fdset);
|
|
tv.tv_usec = 0;
|
|
tv.tv_sec = 1 + (1 << i);
|
|
|
|
ret = select (sock + 1, &fdset, NULL, NULL, &tv);
|
|
if (ret < 0 && errno != EINTR) {
|
|
close(sock);
|
|
goto out;
|
|
}
|
|
if (ret == 1) {
|
|
ret = (*proc->process_rep) (context,
|
|
auth_context,
|
|
is_stream,
|
|
sock,
|
|
result_code,
|
|
result_code_string,
|
|
result_string,
|
|
hi->hostname);
|
|
if (ret == 0)
|
|
done = 1;
|
|
else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
|
|
replied = 1;
|
|
} else {
|
|
ret = KRB5_KDC_UNREACH;
|
|
}
|
|
}
|
|
close (sock);
|
|
}
|
|
}
|
|
|
|
out:
|
|
krb5_krbhst_free (context, handle);
|
|
krb5_auth_con_free (context, auth_context);
|
|
if (done)
|
|
return 0;
|
|
else {
|
|
if (ret == KRB5_KDC_UNREACH) {
|
|
krb5_set_error_string(context,
|
|
"unable to reach any changepw server "
|
|
" in realm %s", realm);
|
|
*result_code = KRB5_KPASSWD_HARDERROR;
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* change the password using the credentials in `creds' (for the
|
|
* principal indicated in them) to `newpw', storing the result of
|
|
* the operation in `result_*' and an error code or 0.
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_change_password (krb5_context context,
|
|
krb5_creds *creds,
|
|
const char *newpw,
|
|
int *result_code,
|
|
krb5_data *result_code_string,
|
|
krb5_data *result_string)
|
|
{
|
|
struct kpwd_proc *p = find_chpw_proto("change password");
|
|
|
|
*result_code = KRB5_KPASSWD_MALFORMED;
|
|
result_code_string->data = result_string->data = NULL;
|
|
result_code_string->length = result_string->length = 0;
|
|
|
|
if (p == NULL)
|
|
return KRB5_KPASSWD_MALFORMED;
|
|
|
|
return change_password_loop(context, creds, NULL, newpw,
|
|
result_code, result_code_string,
|
|
result_string, p);
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_set_password(krb5_context context,
|
|
krb5_creds *creds,
|
|
const char *newpw,
|
|
krb5_principal targprinc,
|
|
int *result_code,
|
|
krb5_data *result_code_string,
|
|
krb5_data *result_string)
|
|
{
|
|
krb5_principal principal = NULL;
|
|
krb5_error_code ret = 0;
|
|
int i;
|
|
|
|
*result_code = KRB5_KPASSWD_MALFORMED;
|
|
result_code_string->data = result_string->data = NULL;
|
|
result_code_string->length = result_string->length = 0;
|
|
|
|
if (targprinc == NULL) {
|
|
ret = krb5_get_default_principal(context, &principal);
|
|
if (ret)
|
|
return ret;
|
|
} else
|
|
principal = targprinc;
|
|
|
|
for (i = 0; procs[i].name != NULL; i++) {
|
|
*result_code = 0;
|
|
ret = change_password_loop(context, creds, principal, newpw,
|
|
result_code, result_code_string,
|
|
result_string,
|
|
&procs[i]);
|
|
if (ret == 0 && *result_code == 0)
|
|
break;
|
|
}
|
|
|
|
if (targprinc == NULL)
|
|
krb5_free_principal(context, principal);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
krb5_error_code KRB5_LIB_FUNCTION
|
|
krb5_set_password_using_ccache(krb5_context context,
|
|
krb5_ccache ccache,
|
|
const char *newpw,
|
|
krb5_principal targprinc,
|
|
int *result_code,
|
|
krb5_data *result_code_string,
|
|
krb5_data *result_string)
|
|
{
|
|
krb5_creds creds, *credsp;
|
|
krb5_error_code ret;
|
|
krb5_principal principal = NULL;
|
|
|
|
*result_code = KRB5_KPASSWD_MALFORMED;
|
|
result_code_string->data = result_string->data = NULL;
|
|
result_code_string->length = result_string->length = 0;
|
|
|
|
memset(&creds, 0, sizeof(creds));
|
|
|
|
if (targprinc == NULL) {
|
|
ret = krb5_cc_get_principal(context, ccache, &principal);
|
|
if (ret)
|
|
return ret;
|
|
} else
|
|
principal = targprinc;
|
|
|
|
ret = krb5_make_principal(context, &creds.server,
|
|
krb5_principal_get_realm(context, principal),
|
|
"kadmin", "changepw", NULL);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = krb5_cc_get_principal(context, ccache, &creds.client);
|
|
if (ret) {
|
|
krb5_free_principal(context, creds.server);
|
|
goto out;
|
|
}
|
|
|
|
ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
|
|
krb5_free_principal(context, creds.server);
|
|
krb5_free_principal(context, creds.client);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = krb5_set_password(context,
|
|
credsp,
|
|
newpw,
|
|
principal,
|
|
result_code,
|
|
result_code_string,
|
|
result_string);
|
|
|
|
krb5_free_creds(context, credsp);
|
|
|
|
return ret;
|
|
out:
|
|
if (targprinc == NULL)
|
|
krb5_free_principal(context, principal);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
const char* KRB5_LIB_FUNCTION
|
|
krb5_passwd_result_to_string (krb5_context context,
|
|
int result)
|
|
{
|
|
static const char *strings[] = {
|
|
"Success",
|
|
"Malformed",
|
|
"Hard error",
|
|
"Auth error",
|
|
"Soft error" ,
|
|
"Access denied",
|
|
"Bad version",
|
|
"Initial flag needed"
|
|
};
|
|
|
|
if (result < 0 || result > KRB5_KPASSWD_INITIAL_FLAG_NEEDED)
|
|
return "unknown result code";
|
|
else
|
|
return strings[result];
|
|
}
|