| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | krb5 set password implementation
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| 4 | Copyright (C) Andrew Tridgell 2001
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| 5 | Copyright (C) Remus Koos 2001 (remuskoos@yahoo.com)
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 3 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 |
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| 21 | #include "includes.h"
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| 22 | #include "smb_krb5.h"
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| 23 | #include "libads/kerberos_proto.h"
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| 24 | #include "../lib/util/asn1.h"
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| 25 |
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| 26 | #ifdef HAVE_KRB5
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| 27 |
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| 28 | /* Those are defined by kerberos-set-passwd-02.txt and are probably
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| 29 | * not supported by M$ implementation */
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| 30 | #define KRB5_KPASSWD_POLICY_REJECT 8
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| 31 | #define KRB5_KPASSWD_BAD_PRINCIPAL 9
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| 32 | #define KRB5_KPASSWD_ETYPE_NOSUPP 10
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| 33 |
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| 34 | /*
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| 35 | * we've got to be able to distinguish KRB_ERRORs from other
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| 36 | * requests - valid response for CHPW v2 replies.
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| 37 | */
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| 38 |
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| 39 | static krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code)
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| 40 | {
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| 41 | switch(res_code) {
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| 42 | case KRB5_KPASSWD_ACCESSDENIED:
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| 43 | return KRB5KDC_ERR_BADOPTION;
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| 44 | case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
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| 45 | return KRB5KDC_ERR_BADOPTION;
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| 46 | /* return KV5M_ALT_METHOD; MIT-only define */
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| 47 | case KRB5_KPASSWD_ETYPE_NOSUPP:
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| 48 | return KRB5KDC_ERR_ETYPE_NOSUPP;
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| 49 | case KRB5_KPASSWD_BAD_PRINCIPAL:
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| 50 | return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
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| 51 | case KRB5_KPASSWD_POLICY_REJECT:
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| 52 | case KRB5_KPASSWD_SOFTERROR:
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| 53 | return KRB5KDC_ERR_POLICY;
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| 54 | default:
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| 55 | return KRB5KRB_ERR_GENERIC;
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| 56 | }
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| 57 | }
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| 58 |
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| 59 | ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *principal,
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| 60 | const char *newpw, int time_offset)
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| 61 | {
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| 62 |
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| 63 | ADS_STATUS aret;
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| 64 | krb5_error_code ret = 0;
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| 65 | krb5_context context = NULL;
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| 66 | krb5_principal princ = NULL;
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| 67 | krb5_ccache ccache = NULL;
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| 68 | int result_code;
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| 69 | krb5_data result_code_string = { 0 };
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| 70 | krb5_data result_string = { 0 };
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| 71 |
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| 72 | initialize_krb5_error_table();
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| 73 | ret = krb5_init_context(&context);
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| 74 | if (ret) {
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| 75 | DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
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| 76 | return ADS_ERROR_KRB5(ret);
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| 77 | }
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| 78 |
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| 79 | if (principal) {
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| 80 | ret = smb_krb5_parse_name(context, principal, &princ);
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| 81 | if (ret) {
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| 82 | krb5_free_context(context);
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| 83 | DEBUG(1, ("Failed to parse %s (%s)\n", principal,
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| 84 | error_message(ret)));
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| 85 | return ADS_ERROR_KRB5(ret);
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| 86 | }
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| 87 | }
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| 88 |
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| 89 | if (time_offset != 0) {
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| 90 | krb5_set_real_time(context, time(NULL) + time_offset, 0);
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| 91 | }
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| 92 |
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| 93 | ret = krb5_cc_default(context, &ccache);
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| 94 | if (ret) {
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| 95 | krb5_free_principal(context, princ);
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| 96 | krb5_free_context(context);
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| 97 | DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
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| 98 | return ADS_ERROR_KRB5(ret);
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| 99 | }
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| 100 |
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| 101 | ret = krb5_set_password_using_ccache(context,
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| 102 | ccache,
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| 103 | discard_const_p(char, newpw),
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| 104 | princ,
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| 105 | &result_code,
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| 106 | &result_code_string,
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| 107 | &result_string);
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| 108 | if (ret) {
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| 109 | DEBUG(1, ("krb5_set_password failed (%s)\n", error_message(ret)));
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| 110 | aret = ADS_ERROR_KRB5(ret);
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| 111 | goto done;
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| 112 | }
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| 113 |
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| 114 | if (result_code != KRB5_KPASSWD_SUCCESS) {
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| 115 | ret = kpasswd_err_to_krb5_err(result_code);
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| 116 | DEBUG(1, ("krb5_set_password failed (%s)\n", error_message(ret)));
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| 117 | aret = ADS_ERROR_KRB5(ret);
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| 118 | goto done;
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| 119 | }
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| 120 |
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| 121 | aret = ADS_SUCCESS;
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| 122 |
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| 123 | done:
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| 124 | kerberos_free_data_contents(context, &result_code_string);
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| 125 | kerberos_free_data_contents(context, &result_string);
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| 126 | krb5_free_principal(context, princ);
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| 127 | krb5_cc_close(context, ccache);
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| 128 | krb5_free_context(context);
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| 129 |
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| 130 | return aret;
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| 131 | }
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| 132 |
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| 133 | /*
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| 134 | we use a prompter to avoid a crash bug in the kerberos libs when
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| 135 | dealing with empty passwords
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| 136 | this prompter is just a string copy ...
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| 137 | */
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| 138 | static krb5_error_code
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| 139 | kerb_prompter(krb5_context ctx, void *data,
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| 140 | const char *name,
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| 141 | const char *banner,
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| 142 | int num_prompts,
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| 143 | krb5_prompt prompts[])
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| 144 | {
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| 145 | if (num_prompts == 0) return 0;
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| 146 |
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| 147 | memset(prompts[0].reply->data, 0, prompts[0].reply->length);
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| 148 | if (prompts[0].reply->length > 0) {
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| 149 | if (data) {
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| 150 | strncpy((char *)prompts[0].reply->data,
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| 151 | (const char *)data,
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| 152 | prompts[0].reply->length-1);
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| 153 | prompts[0].reply->length = strlen((const char *)prompts[0].reply->data);
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| 154 | } else {
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| 155 | prompts[0].reply->length = 0;
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| 156 | }
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| 157 | }
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| 158 | return 0;
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| 159 | }
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| 160 |
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| 161 | static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
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| 162 | const char *principal,
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| 163 | const char *oldpw,
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| 164 | const char *newpw,
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| 165 | int time_offset)
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| 166 | {
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| 167 | ADS_STATUS aret;
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| 168 | krb5_error_code ret;
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| 169 | krb5_context context = NULL;
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| 170 | krb5_principal princ;
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| 171 | krb5_get_init_creds_opt opts;
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| 172 | krb5_creds creds;
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| 173 | char *chpw_princ = NULL, *password;
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| 174 | char *realm = NULL;
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| 175 | int result_code;
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| 176 | krb5_data result_code_string = { 0 };
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| 177 | krb5_data result_string = { 0 };
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| 178 | smb_krb5_addresses *addr = NULL;
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| 179 |
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| 180 | initialize_krb5_error_table();
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| 181 | ret = krb5_init_context(&context);
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| 182 | if (ret) {
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| 183 | DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
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| 184 | return ADS_ERROR_KRB5(ret);
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| 185 | }
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| 186 |
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| 187 | if ((ret = smb_krb5_parse_name(context, principal,
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| 188 | &princ))) {
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| 189 | krb5_free_context(context);
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| 190 | DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
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| 191 | return ADS_ERROR_KRB5(ret);
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| 192 | }
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| 193 |
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| 194 | krb5_get_init_creds_opt_init(&opts);
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| 195 |
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| 196 | krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
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| 197 | krb5_get_init_creds_opt_set_renew_life(&opts, 0);
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| 198 | krb5_get_init_creds_opt_set_forwardable(&opts, 0);
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| 199 | krb5_get_init_creds_opt_set_proxiable(&opts, 0);
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| 200 |
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| 201 | /* note that heimdal will fill in the local addresses if the addresses
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| 202 | * in the creds_init_opt are all empty and then later fail with invalid
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| 203 | * address, sending our local netbios krb5 address - just like windows
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| 204 | * - avoids this - gd */
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| 205 | ret = smb_krb5_gen_netbios_krb5_address(&addr, lp_netbios_name());
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| 206 | if (ret) {
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| 207 | krb5_free_principal(context, princ);
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| 208 | krb5_free_context(context);
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| 209 | return ADS_ERROR_KRB5(ret);
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| 210 | }
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| 211 | krb5_get_init_creds_opt_set_address_list(&opts, addr->addrs);
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| 212 |
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| 213 | realm = smb_krb5_principal_get_realm(context, princ);
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| 214 |
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| 215 | /* We have to obtain an INITIAL changepw ticket for changing password */
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| 216 | if (asprintf(&chpw_princ, "kadmin/changepw@%s", realm) == -1) {
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| 217 | krb5_free_context(context);
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| 218 | free(realm);
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| 219 | DEBUG(1,("ads_krb5_chg_password: asprintf fail\n"));
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| 220 | return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
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| 221 | }
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| 222 |
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| 223 | free(realm);
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| 224 | password = SMB_STRDUP(oldpw);
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| 225 | ret = krb5_get_init_creds_password(context, &creds, princ, password,
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| 226 | kerb_prompter, NULL,
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| 227 | 0, chpw_princ, &opts);
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| 228 | SAFE_FREE(chpw_princ);
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| 229 | SAFE_FREE(password);
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| 230 |
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| 231 | if (ret) {
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| 232 | if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
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| 233 | DEBUG(1,("Password incorrect while getting initial ticket"));
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| 234 | else
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| 235 | DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
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| 236 |
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| 237 | krb5_free_principal(context, princ);
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| 238 | krb5_free_context(context);
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| 239 | return ADS_ERROR_KRB5(ret);
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| 240 | }
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| 241 |
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| 242 | ret = krb5_change_password(context,
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| 243 | &creds,
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| 244 | discard_const_p(char, newpw),
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| 245 | &result_code,
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| 246 | &result_code_string,
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| 247 | &result_string);
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| 248 | if (ret) {
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| 249 | DEBUG(1, ("krb5_change_password failed (%s)\n", error_message(ret)));
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| 250 | aret = ADS_ERROR_KRB5(ret);
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| 251 | goto done;
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| 252 | }
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| 253 |
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| 254 | if (result_code != KRB5_KPASSWD_SUCCESS) {
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| 255 | ret = kpasswd_err_to_krb5_err(result_code);
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| 256 | DEBUG(1, ("krb5_change_password failed (%s)\n", error_message(ret)));
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| 257 | aret = ADS_ERROR_KRB5(ret);
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| 258 | goto done;
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| 259 | }
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| 260 |
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| 261 | aret = ADS_SUCCESS;
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| 262 |
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| 263 | done:
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| 264 | kerberos_free_data_contents(context, &result_code_string);
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| 265 | kerberos_free_data_contents(context, &result_string);
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| 266 | krb5_free_principal(context, princ);
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| 267 | krb5_free_context(context);
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| 268 |
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| 269 | return aret;
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| 270 | }
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| 271 |
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| 272 |
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| 273 | ADS_STATUS kerberos_set_password(const char *kpasswd_server,
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| 274 | const char *auth_principal, const char *auth_password,
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| 275 | const char *target_principal, const char *new_password,
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| 276 | int time_offset)
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| 277 | {
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| 278 | int ret;
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| 279 |
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| 280 | if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL))) {
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| 281 | DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
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| 282 | return ADS_ERROR_KRB5(ret);
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| 283 | }
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| 284 |
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| 285 | if (!strcmp(auth_principal, target_principal))
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| 286 | return ads_krb5_chg_password(kpasswd_server, target_principal,
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| 287 | auth_password, new_password, time_offset);
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| 288 | else
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| 289 | return ads_krb5_set_password(kpasswd_server, target_principal,
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| 290 | new_password, time_offset);
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| 291 | }
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| 292 |
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| 293 | #endif
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