diff options
Diffstat (limited to 'source4/libads/krb5_setpw.c')
| -rw-r--r-- | source4/libads/krb5_setpw.c | 689 |
1 files changed, 0 insertions, 689 deletions
diff --git a/source4/libads/krb5_setpw.c b/source4/libads/krb5_setpw.c deleted file mode 100644 index 257c28e755..0000000000 --- a/source4/libads/krb5_setpw.c +++ /dev/null @@ -1,689 +0,0 @@ -/* - Unix SMB/CIFS implementation. - krb5 set password implementation - Copyright (C) Andrew Tridgell 2001 - Copyright (C) Remus Koos 2001 (remuskoos@yahoo.com) - - 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., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include "includes.h" - -#ifdef HAVE_KRB5 - -#define DEFAULT_KPASSWD_PORT 464 -#define KRB5_KPASSWD_VERS_CHANGEPW 1 -#define KRB5_KPASSWD_VERS_SETPW 2 -#define KRB5_KPASSWD_VERS_SETPW_MS 0xff80 -#define KRB5_KPASSWD_ACCESSDENIED 5 -#define KRB5_KPASSWD_BAD_VERSION 6 -#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7 - -/* Those are defined by kerberos-set-passwd-02.txt and are probably - * not supported by M$ implementation */ -#define KRB5_KPASSWD_POLICY_REJECT 8 -#define KRB5_KPASSWD_BAD_PRINCIPAL 9 -#define KRB5_KPASSWD_ETYPE_NOSUPP 10 - -/* This implements kerberos password change protocol as specified in - * kerb-chg-password-02.txt and kerberos-set-passwd-02.txt - * as well as microsoft version of the protocol - * as specified in kerberos-set-passwd-00.txt - */ -static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password) -{ - char* princ_part1 = NULL; - char* princ_part2 = NULL; - char* realm = NULL; - char* c; - char* princ; - struct asn1_data req; - DATA_BLOB ret; - - - princ = strdup(principal); - - if ((c = strchr(princ, '/')) == NULL) { - c = princ; - } else { - *c = '\0'; - c++; - princ_part1 = princ; - } - - princ_part2 = c; - - if ((c = strchr(c, '@')) != NULL) { - *c = '\0'; - c++; - realm = c; - } - - memset(&req, 0, sizeof(req)); - - asn1_push_tag(&req, ASN1_SEQUENCE(0)); - asn1_push_tag(&req, ASN1_CONTEXT(0)); - asn1_write_OctetString(&req, password, strlen(password)); - asn1_pop_tag(&req); - - asn1_push_tag(&req, ASN1_CONTEXT(1)); - asn1_push_tag(&req, ASN1_SEQUENCE(0)); - - asn1_push_tag(&req, ASN1_CONTEXT(0)); - asn1_write_Integer(&req, 1); - asn1_pop_tag(&req); - - asn1_push_tag(&req, ASN1_CONTEXT(1)); - asn1_push_tag(&req, ASN1_SEQUENCE(0)); - - if (princ_part1) - asn1_write_GeneralString(&req, princ_part1); - - asn1_write_GeneralString(&req, princ_part2); - asn1_pop_tag(&req); - asn1_pop_tag(&req); - asn1_pop_tag(&req); - asn1_pop_tag(&req); - - asn1_push_tag(&req, ASN1_CONTEXT(2)); - asn1_write_GeneralString(&req, realm); - asn1_pop_tag(&req); - asn1_pop_tag(&req); - - ret = data_blob(req.data, req.length); - asn1_free(&req); - - free(princ); - - return ret; -} - -static krb5_error_code build_kpasswd_request(uint16_t pversion, - krb5_context context, - krb5_auth_context auth_context, - krb5_data *ap_req, - const char *princ, - const char *passwd, - krb5_data *packet) -{ - krb5_error_code ret; - krb5_data cipherpw; - krb5_data encoded_setpw; - krb5_replay_data replay; - char *p; - DATA_BLOB setpw; - - ret = krb5_auth_con_setflags(context, - auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE); - if (ret) { - DEBUG(1,("krb5_auth_con_setflags failed (%s)\n", - error_message(ret))); - return ret; - } - - /* handle protocol differences in chpw and setpw */ - if (pversion == KRB5_KPASSWD_VERS_CHANGEPW) - setpw = data_blob(passwd, strlen(passwd)); - else if (pversion == KRB5_KPASSWD_VERS_SETPW || - pversion == KRB5_KPASSWD_VERS_SETPW_MS) - setpw = encode_krb5_setpw(princ, passwd); - else - return EINVAL; - - encoded_setpw.data = (char *)setpw.data; - encoded_setpw.length = setpw.length; - - ret = krb5_mk_priv(context, auth_context, - &encoded_setpw, &cipherpw, &replay); - - data_blob_free(&setpw); /*from 'encode_krb5_setpw(...)' */ - - if (ret) { - DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret))); - return ret; - } - - packet->data = (char *)malloc(ap_req->length + cipherpw.length + 6); - if (!packet->data) - return -1; - - /* see the RFC for details */ - p = ((char *)packet->data) + 2; - RSSVAL(p, 0, pversion); - p += 2; - RSSVAL(p, 0, ap_req->length); - p += 2; - memcpy(p, ap_req->data, ap_req->length); - p += ap_req->length; - memcpy(p, cipherpw.data, cipherpw.length); - p += cipherpw.length; - packet->length = PTR_DIFF(p,packet->data); - RSSVAL(packet->data, 0, packet->length); - - free(cipherpw.data); /* from 'krb5_mk_priv(...)' */ - - return 0; -} - -static const struct kpasswd_errors { - int result_code; - const char *error_string; -} kpasswd_errors[] = { - {KRB5_KPASSWD_MALFORMED, "Malformed request error"}, - {KRB5_KPASSWD_HARDERROR, "Server error"}, - {KRB5_KPASSWD_AUTHERROR, "Authentication error"}, - {KRB5_KPASSWD_SOFTERROR, "Password change rejected"}, - {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"}, - {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"}, - {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"}, - {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"}, - {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"}, - {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"}, - {0, NULL} -}; - -static krb5_error_code setpw_result_code_string(krb5_context context, - int result_code, - const char **code_string) -{ - uint_t idx = 0; - - while (kpasswd_errors[idx].error_string != NULL) { - if (kpasswd_errors[idx].result_code == - result_code) { - *code_string = kpasswd_errors[idx].error_string; - return 0; - } - idx++; - } - *code_string = "Password change failed"; - return (0); -} - -static krb5_error_code parse_setpw_reply(krb5_context context, - krb5_auth_context auth_context, - krb5_data *packet) -{ - krb5_data ap_rep; - char *p; - int vnum, ret, res_code; - krb5_data cipherresult; - krb5_data clearresult; - krb5_ap_rep_enc_part *ap_rep_enc; - krb5_replay_data replay; - - if (packet->length < 4) { - return KRB5KRB_AP_ERR_MODIFIED; - } - - p = packet->data; - - if (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e) { - /* it's an error packet. We should parse it ... */ - DEBUG(1,("Got error packet 0x%x from kpasswd server\n", - ((char *)packet->data)[0])); - return KRB5KRB_AP_ERR_MODIFIED; - } - - if (RSVAL(p, 0) != packet->length) { - DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n", - RSVAL(p, 0), packet->length)); - return KRB5KRB_AP_ERR_MODIFIED; - } - - p += 2; - - vnum = RSVAL(p, 0); p += 2; - - /* FIXME: According to standard there is only one type of reply */ - if (vnum != KRB5_KPASSWD_VERS_SETPW && - vnum != KRB5_KPASSWD_VERS_SETPW_MS && - vnum != KRB5_KPASSWD_VERS_CHANGEPW) { - DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum)); - return KRB5KDC_ERR_BAD_PVNO; - } - - ap_rep.length = RSVAL(p, 0); p += 2; - - if (p + ap_rep.length >= (char *)packet->data + packet->length) { - DEBUG(1,("ptr beyond end of packet from kpasswd server\n")); - return KRB5KRB_AP_ERR_MODIFIED; - } - - if (ap_rep.length == 0) { - DEBUG(1,("got unencrypted setpw result?!\n")); - return KRB5KRB_AP_ERR_MODIFIED; - } - - /* verify ap_rep */ - ap_rep.data = p; - p += ap_rep.length; - - ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc); - if (ret) { - DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret))); - return KRB5KRB_AP_ERR_MODIFIED; - } - - krb5_free_ap_rep_enc_part(context, ap_rep_enc); - - cipherresult.data = p; - cipherresult.length = ((char *)packet->data + packet->length) - p; - - ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult, - &replay); - if (ret) { - DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret))); - return KRB5KRB_AP_ERR_MODIFIED; - } - - if (clearresult.length < 2) { - free(clearresult.data); - ret = KRB5KRB_AP_ERR_MODIFIED; - return KRB5KRB_AP_ERR_MODIFIED; - } - - p = clearresult.data; - - res_code = RSVAL(p, 0); - - free(clearresult.data); - - if ((res_code < KRB5_KPASSWD_SUCCESS) || - (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) { - return KRB5KRB_AP_ERR_MODIFIED; - } - - if(res_code == KRB5_KPASSWD_SUCCESS) - return 0; - else { - const char *errstr; - setpw_result_code_string(context, res_code, &errstr); - DEBUG(1, ("Error changing password: %s\n", errstr)); - - switch(res_code) { - case KRB5_KPASSWD_ACCESSDENIED: - return KRB5KDC_ERR_BADOPTION; - break; - case KRB5_KPASSWD_INITIAL_FLAG_NEEDED: - return KRB5KDC_ERR_BADOPTION; - /* return KV5M_ALT_METHOD; MIT-only define */ - break; - case KRB5_KPASSWD_ETYPE_NOSUPP: - return KRB5KDC_ERR_ETYPE_NOSUPP; - break; - case KRB5_KPASSWD_BAD_PRINCIPAL: - return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN; - break; - case KRB5_KPASSWD_POLICY_REJECT: - return KRB5KDC_ERR_POLICY; - break; - default: - return KRB5KRB_ERR_GENERIC; - break; - } - } -} - -static ADS_STATUS do_krb5_kpasswd_request(krb5_context context, - const char *kdc_host, - uint16_t pversion, - krb5_creds *credsp, - const char *princ, - const char *newpw) -{ - krb5_auth_context auth_context = NULL; - krb5_data ap_req, chpw_req, chpw_rep; - int ret, sock, addr_len; - struct sockaddr remote_addr, local_addr; - krb5_address local_kaddr, remote_kaddr; - - ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY, - NULL, credsp, &ap_req); - if (ret) { - DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT); - if (sock == -1) { - int rc = errno; - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("failed to open kpasswd socket to %s (%s)\n", - kdc_host, strerror(errno))); - return ADS_ERROR_SYSTEM(rc); - } - - addr_len = sizeof(remote_addr); - getpeername(sock, &remote_addr, &addr_len); - addr_len = sizeof(local_addr); - getsockname(sock, &local_addr, &addr_len); - - setup_kaddr(&remote_kaddr, &remote_addr); - setup_kaddr(&local_kaddr, &local_addr); - - ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL); - if (ret) { - close(sock); - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - ret = build_kpasswd_request(pversion, context, auth_context, &ap_req, - princ, newpw, &chpw_req); - if (ret) { - close(sock); - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) { - close(sock); - free(chpw_req.data); - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("send of chpw failed (%s)\n", strerror(errno))); - return ADS_ERROR_SYSTEM(errno); - } - - free(chpw_req.data); - - chpw_rep.length = 1500; - chpw_rep.data = (char *) malloc(chpw_rep.length); - if (!chpw_rep.data) { - close(sock); - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("send of chpw failed (%s)\n", strerror(errno))); - errno = ENOMEM; - return ADS_ERROR_SYSTEM(errno); - } - - ret = read(sock, chpw_rep.data, chpw_rep.length); - if (ret < 0) { - close(sock); - free(chpw_rep.data); - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno))); - return ADS_ERROR_SYSTEM(errno); - } - - close(sock); - chpw_rep.length = ret; - - ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr); - if (ret) { - free(chpw_rep.data); - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n", - error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - ret = parse_setpw_reply(context, auth_context, &chpw_rep); - free(chpw_rep.data); - - if (ret) { - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - DEBUG(1,("parse_setpw_reply failed (%s)\n", - error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - free(ap_req.data); - krb5_auth_con_free(context, auth_context); - - return ADS_SUCCESS; -} - -ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ, - const char *newpw, int time_offset) -{ - - ADS_STATUS aret; - krb5_error_code ret; - krb5_context context; - krb5_principal principal; - char *princ_name; - char *realm; - krb5_creds creds, *credsp; - krb5_ccache ccache; - - ret = krb5_init_context(&context); - if (ret) { - DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - if (time_offset != 0) { - krb5_set_real_time(context, time(NULL) + time_offset, 0); - } - - ret = krb5_cc_default(context, &ccache); - if (ret) { - krb5_free_context(context); - DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - ZERO_STRUCT(creds); - - realm = strchr(princ, '@'); - realm++; - - asprintf(&princ_name, "kadmin/changepw@%s", realm); - ret = krb5_parse_name(context, princ_name, &creds.server); - if (ret) { - krb5_free_context(context); - DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - free(princ_name); - - /* parse the principal we got as a function argument */ - ret = krb5_parse_name(context, princ, &principal); - if (ret) { - krb5_free_context(context); - DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - krb5_princ_set_realm(context, creds.server, - krb5_princ_realm(context, principal)); - - ret = krb5_cc_get_principal(context, ccache, &creds.client); - if (ret) { - krb5_free_principal(context, principal); - krb5_free_context(context); - DEBUG(1,("Failed to get principal from ccache (%s)\n", - error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp); - if (ret) { - krb5_free_principal(context, creds.client); - krb5_free_principal(context, principal); - krb5_free_context(context); - DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - /* we might have to call krb5_free_creds(...) from now on ... */ - - aret = do_krb5_kpasswd_request(context, kdc_host, - KRB5_KPASSWD_VERS_SETPW_MS, - credsp, princ, newpw); - - krb5_free_creds(context, credsp); - krb5_free_principal(context, creds.client); - krb5_free_principal(context, principal); - krb5_free_context(context); - - return aret; -} - -/* - we use a prompter to avoid a crash bug in the kerberos libs when - dealing with empty passwords - this prompter is just a string copy ... -*/ -static krb5_error_code -kerb_prompter(krb5_context ctx, void *data, - const char *name, - const char *banner, - int num_prompts, - krb5_prompt prompts[]) -{ - if (num_prompts == 0) return 0; - - memset(prompts[0].reply->data, 0, prompts[0].reply->length); - if (prompts[0].reply->length > 0) { - if (data) { - strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1); - prompts[0].reply->length = strlen(prompts[0].reply->data); - } else { - prompts[0].reply->length = 0; - } - } - return 0; -} - -static ADS_STATUS ads_krb5_chg_password(const char *kdc_host, - const char *principal, - const char *oldpw, - const char *newpw, - int time_offset) -{ - ADS_STATUS aret; - krb5_error_code ret; - krb5_context context; - krb5_principal princ; - krb5_get_init_creds_opt opts; - krb5_creds creds; - char *chpw_princ = NULL, *password; - - ret = krb5_init_context(&context); - if (ret) { - DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - if ((ret = krb5_parse_name(context, principal, - &princ))) { - krb5_free_context(context); - DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - krb5_get_init_creds_opt_init(&opts); - krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60); - krb5_get_init_creds_opt_set_renew_life(&opts, 0); - krb5_get_init_creds_opt_set_forwardable(&opts, 0); - krb5_get_init_creds_opt_set_proxiable(&opts, 0); - - /* We have to obtain an INITIAL changepw ticket for changing password */ - asprintf(&chpw_princ, "kadmin/changepw@%s", - (char *) krb5_princ_realm(context, princ)); - password = strdup(oldpw); - ret = krb5_get_init_creds_password(context, &creds, princ, password, - kerb_prompter, NULL, - 0, chpw_princ, &opts); - SAFE_FREE(chpw_princ); - SAFE_FREE(password); - - if (ret) { - if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) - DEBUG(1,("Password incorrect while getting initial ticket")); - else - DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret))); - - krb5_free_principal(context, princ); - krb5_free_context(context); - return ADS_ERROR_KRB5(ret); - } - - aret = do_krb5_kpasswd_request(context, kdc_host, - KRB5_KPASSWD_VERS_CHANGEPW, - &creds, principal, newpw); - - krb5_free_principal(context, princ); - krb5_free_context(context); - - return aret; -} - - -ADS_STATUS kerberos_set_password(const char *kpasswd_server, - const char *auth_principal, const char *auth_password, - const char *target_principal, const char *new_password, - int time_offset) -{ - int ret; - - if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset))) { - DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret))); - return ADS_ERROR_KRB5(ret); - } - - if (!strcmp(auth_principal, target_principal)) - return ads_krb5_chg_password(kpasswd_server, target_principal, - auth_password, new_password, time_offset); - else - return ads_krb5_set_password(kpasswd_server, target_principal, - new_password, time_offset); -} - - -/** - * Set the machine account password - * @param ads connection to ads server - * @param hostname machine whose password is being set - * @param password new password - * @return status of password change - **/ -ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads, - const char *machine_account, - const char *password) -{ - ADS_STATUS status; - char *principal = NULL; - - /* - we need to use the '$' form of the name here (the machine account name), - as otherwise the server might end up setting the password for a user - instead - */ - asprintf(&principal, "%s@%s", machine_account, ads->config.realm); - - status = ads_krb5_set_password(ads->auth.kdc_server, principal, - password, ads->auth.time_offset); - - free(principal); - - return status; -} - - - -#endif |