diff options
Diffstat (limited to 'crypto/heimdal/lib/krb5/changepw.c')
| -rw-r--r-- | crypto/heimdal/lib/krb5/changepw.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/krb5/changepw.c b/crypto/heimdal/lib/krb5/changepw.c new file mode 100644 index 000000000000..fd9444062934 --- /dev/null +++ b/crypto/heimdal/lib/krb5/changepw.c @@ -0,0 +1,346 @@ +/* + * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <krb5_locl.h> + +RCSID("$Id: changepw.c,v 1.19 1999/12/11 23:14:51 assar Exp $"); + +static krb5_error_code +get_kdc_address (krb5_context context, + krb5_realm realm, + struct addrinfo **ai) +{ + struct addrinfo hints; + krb5_error_code ret; + char **hostlist; + int port = 0; + char portstr[NI_MAXSERV]; + int error; + char *host; + char *dot; + + ret = krb5_get_krb_changepw_hst (context, + &realm, + &hostlist); + if (ret) + return ret; + + host = *hostlist; + + dot = strchr (host, ':'); + if (dot != NULL) { + char *end; + + *dot++ = '\0'; + port = strtol (dot, &end, 0); + } + if (port == 0) + port = krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT); + snprintf (portstr, sizeof(portstr), "%u", ntohs(port)); + + memset (&hints, 0, sizeof(hints)); + hints.ai_socktype = SOCK_DGRAM; + hints.ai_protocol = IPPROTO_UDP; + + error = getaddrinfo (host, portstr, &hints, ai); + krb5_free_krbhst (context, hostlist); + return error; +} + +static krb5_error_code +send_request (krb5_context context, + krb5_auth_context *auth_context, + krb5_creds *creds, + int sock, + struct sockaddr *sa, + int sa_size, + char *passwd) +{ + krb5_error_code ret; + krb5_data ap_req_data; + krb5_data krb_priv_data; + krb5_data passwd_data; + size_t len; + u_char header[6]; + u_char *p; + struct iovec iov[3]; + struct msghdr msghdr; + + krb5_data_zero (&ap_req_data); + + ret = krb5_mk_req_extended (context, + auth_context, + AP_OPTS_MUTUAL_REQUIRED, + NULL, /* in_data */ + creds, + &ap_req_data); + if (ret) + return ret; + + passwd_data.data = passwd; + passwd_data.length = strlen(passwd); + + krb5_data_zero (&krb_priv_data); + + ret = krb5_mk_priv (context, + *auth_context, + &passwd_data, + &krb_priv_data, + NULL); + if (ret) + goto out2; + + len = 6 + ap_req_data.length + krb_priv_data.length; + p = header; + *p++ = (len >> 8) & 0xFF; + *p++ = (len >> 0) & 0xFF; + *p++ = 0; + *p++ = 1; + *p++ = (ap_req_data.length >> 8) & 0xFF; + *p++ = (ap_req_data.length >> 0) & 0xFF; + + memset(&msghdr, 0, sizeof(msghdr)); + msghdr.msg_name = (void *)sa; + msghdr.msg_namelen = sa_size; + msghdr.msg_iov = iov; + msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov); +#if 0 + msghdr.msg_control = NULL; + msghdr.msg_controllen = 0; +#endif + + iov[0].iov_base = (void*)header; + iov[0].iov_len = 6; + iov[1].iov_base = ap_req_data.data; + iov[1].iov_len = ap_req_data.length; + iov[2].iov_base = krb_priv_data.data; + iov[2].iov_len = krb_priv_data.length; + + if (sendmsg (sock, &msghdr, 0) < 0) + ret = errno; + + krb5_data_free (&krb_priv_data); +out2: + krb5_data_free (&ap_req_data); + return ret; +} + +static void +str2data (krb5_data *d, + char *fmt, + ...) +{ + va_list args; + + va_start(args, fmt); + d->length = vasprintf ((char **)&d->data, fmt, args); + va_end(args); +} + +static krb5_error_code +process_reply (krb5_context context, + krb5_auth_context auth_context, + int sock, + int *result_code, + krb5_data *result_code_string, + krb5_data *result_string) +{ + krb5_error_code ret; + u_char reply[BUFSIZ]; + size_t len; + u_int16_t pkt_len, pkt_ver; + krb5_data ap_rep_data; + + ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL); + if (ret < 0) + return errno; + + len = ret; + pkt_len = (reply[0] << 8) | (reply[1]); + pkt_ver = (reply[2] << 8) | (reply[3]); + + if (pkt_len != len) { + str2data (result_string, "client: wrong len in reply"); + *result_code = KRB5_KPASSWD_MALFORMED; + return 0; + } + if (pkt_ver != 0x0001) { + str2data (result_string, + "client: wrong version number (%d)", pkt_ver); + *result_code = KRB5_KPASSWD_MALFORMED; + return 0; + } + + ap_rep_data.data = reply + 6; + ap_rep_data.length = (reply[4] << 8) | (reply[5]); + + if (ap_rep_data.length) { + krb5_ap_rep_enc_part *ap_rep; + krb5_data priv_data; + u_char *p; + + ret = krb5_rd_rep (context, + auth_context, + &ap_rep_data, + &ap_rep); + if (ret) + return ret; + + krb5_free_ap_rep_enc_part (context, ap_rep); + + priv_data.data = (u_char*)ap_rep_data.data + ap_rep_data.length; + priv_data.length = len - ap_rep_data.length - 6; + + ret = krb5_rd_priv (context, + auth_context, + &priv_data, + result_code_string, + NULL); + if (ret) { + krb5_data_free (result_code_string); + return ret; + } + + if (result_code_string->length < 2) { + *result_code = KRB5_KPASSWD_MALFORMED; + str2data (result_string, + "client: bad length in result"); + return 0; + } + p = result_code_string->data; + + *result_code = (p[0] << 8) | p[1]; + krb5_data_copy (result_string, + (unsigned char*)result_code_string->data + 2, + result_code_string->length - 2); + return 0; + } else { + KRB_ERROR error; + size_t size; + u_char *p; + + ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size); + if (ret) { + return ret; + } + if (error.e_data->length < 2) { + krb5_warnx (context, "too short e_data to print anything usable"); + return 1; + } + + p = error.e_data->data; + *result_code = (p[0] << 8) | p[1]; + krb5_data_copy (result_string, + p + 2, + error.e_data->length - 2); + return 0; + } +} + +krb5_error_code +krb5_change_password (krb5_context context, + krb5_creds *creds, + char *newpw, + int *result_code, + krb5_data *result_code_string, + krb5_data *result_string) +{ + krb5_error_code ret; + krb5_auth_context auth_context = NULL; + int sock; + int i; + struct addrinfo *ai, *a; + + ret = krb5_auth_con_init (context, &auth_context); + if (ret) + return ret; + + ret = get_kdc_address (context, creds->client->realm, &ai); + if (ret) + goto out; + + krb5_auth_con_setflags (context, auth_context, + KRB5_AUTH_CONTEXT_DO_SEQUENCE); + + for (a = ai; a != NULL; a = a->ai_next) { + sock = socket (a->ai_family, a->ai_socktype, a->ai_protocol); + if (sock < 0) + continue; + + for (i = 0; i < 5; ++i) { + fd_set fdset; + struct timeval tv; + + ret = send_request (context, + &auth_context, + creds, + sock, + a->ai_addr, + a->ai_addrlen, + newpw); + if (ret) + goto out; + + FD_ZERO(&fdset); + FD_SET(sock, &fdset); + tv.tv_usec = 0; + tv.tv_sec = 1 << i; + + ret = select (sock + 1, &fdset, NULL, NULL, &tv); + if (ret < 0 && errno != EINTR) + goto out; + if (ret == 1) + break; + } + if (i == 5) { + ret = KRB5_KDC_UNREACH; + close (sock); + continue; + } + + ret = process_reply (context, + auth_context, + sock, + result_code, + result_code_string, + result_string); + close (sock); + if (ret == 0) + break; + } + freeaddrinfo (ai); + +out: + krb5_auth_con_free (context, auth_context); + return ret; +} |