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If TGTs can be used as kpasswd tickets, the two-minute lifetime of a authentic kpasswd ticket may be bypassed. Furthermore, kpasswd tickets are not supposed to be cached, but using this flaw, a stolen credentials cache containing a TGT may be used to change that account's password, and thus is made more valuable to an attacker. Since all TGTs should be issued with a REQUESTER_SID PAC buffer, and service tickets without it, we assert the absence of this buffer to ensure we're not accepting a TGT. BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047 BUG: https://bugzilla.samba.org/show_bug.cgi?id=15049 Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz> Reviewed-by: Andreas Schneider <asn@samba.org>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba kpasswd implementation
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Copyright (c) 2016 Andreas Schneider <asn@samba.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _KPASSWD_HELPER_H
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#define _KPASSWD_HELPER_H
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bool kpasswd_make_error_reply(TALLOC_CTX *mem_ctx,
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krb5_error_code error_code,
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const char *error_string,
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DATA_BLOB *error_data);
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bool kpasswd_make_pwchange_reply(TALLOC_CTX *mem_ctx,
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NTSTATUS status,
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enum samPwdChangeReason reject_reason,
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struct samr_DomInfo1 *dominfo,
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DATA_BLOB *error_blob);
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NTSTATUS kpasswd_samdb_set_password(TALLOC_CTX *mem_ctx,
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struct tevent_context *event_ctx,
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struct loadparm_context *lp_ctx,
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struct auth_session_info *session_info,
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bool is_service_principal,
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const char *target_principal_name,
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DATA_BLOB *password,
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enum samPwdChangeReason *reject_reason,
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struct samr_DomInfo1 **dominfo);
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krb5_error_code kpasswd_check_non_tgt(struct auth_session_info *session_info,
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const char **error_string);
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#endif /* _KPASSWD_HELPER_H */
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