static bool kpasswd_make_pwchange_reply(struct kdc_server *kdc, TALLOC_CTX *mem_ctx, NTSTATUS status, enum samr_RejectReason reject_reason, struct samr_DomInfo1 *dominfo, DATA_BLOB *error_blob) { if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_ACCESSDENIED, "No such user when changing password", error_blob); } if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_ACCESSDENIED, "Not permitted to change password", error_blob); } if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) { const char *reject_string; switch (reject_reason) { case SAMR_REJECT_TOO_SHORT: reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long", dominfo->min_password_length); break; case SAMR_REJECT_COMPLEXITY: reject_string = "Password does not meet complexity requirements"; break; case SAMR_REJECT_IN_HISTORY: reject_string = "Password is already in password history"; break; case SAMR_REJECT_OTHER: default: reject_string = talloc_asprintf(mem_ctx, "Password must be at least %d characters long, and cannot match any of your %d previous passwords", dominfo->min_password_length, dominfo->password_history_length); break; } return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SOFTERROR, reject_string, error_blob); } if (!NT_STATUS_IS_OK(status)) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_HARDERROR, talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)), error_blob); } return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS, "Password changed", error_blob); }
/* Return true if there is a valid error packet formed in the error_blob */ static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc, TALLOC_CTX *mem_ctx, uint16_t result_code, const char *error_string, DATA_BLOB *error_blob) { bool ret; int kret; DATA_BLOB error_bytes; krb5_data k5_error_bytes, k5_error_blob; ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string, &error_bytes); if (!ret) { return false; } k5_error_bytes.data = error_bytes.data; k5_error_bytes.length = error_bytes.length; kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context, result_code, NULL, &k5_error_bytes, NULL, NULL, NULL, NULL, &k5_error_blob); if (kret) { return false; } *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length); krb5_data_free(&k5_error_blob); if (!error_blob->data) { return false; } return true; }
/* A user password change Return true if there is a valid error packet (or sucess) formed in the error_blob */ static bool kpasswdd_change_password(struct kdc_server *kdc, TALLOC_CTX *mem_ctx, struct auth_session_info *session_info, const DATA_BLOB *password, DATA_BLOB *reply) { NTSTATUS status; enum samPwdChangeReason reject_reason; struct samr_DomInfo1 *dominfo; struct ldb_context *samdb; samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, system_session(kdc->task->lp_ctx)); if (!samdb) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_HARDERROR, "Failed to open samdb", reply); } DEBUG(3, ("Changing password of %s\\%s (%s)\n", session_info->server_info->domain_name, session_info->server_info->account_name, dom_sid_string(mem_ctx, session_info->security_token->user_sid))); /* User password change */ status = samdb_set_password_sid(samdb, mem_ctx, session_info->security_token->user_sid, password, NULL, NULL, true, /* this is a user password change */ &reject_reason, &dominfo); return kpasswd_make_pwchange_reply(kdc, mem_ctx, status, reject_reason, dominfo, reply); }
static bool kpasswd_process_request(struct kdc_server *kdc, TALLOC_CTX *mem_ctx, struct gensec_security *gensec_security, uint16_t version, DATA_BLOB *input, DATA_BLOB *reply) { struct auth_session_info *session_info; size_t pw_len; if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security, &session_info))) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_HARDERROR, "gensec_session_info failed!", reply); } switch (version) { case KRB5_KPASSWD_VERS_CHANGEPW: { DATA_BLOB password; if (!convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), CH_UTF8, CH_UTF16, (const char *)input->data, input->length, (void **)&password.data, &pw_len, false)) { return false; } password.length = pw_len; return kpasswdd_change_password(kdc, mem_ctx, session_info, &password, reply); break; } case KRB5_KPASSWD_VERS_SETPW: { NTSTATUS status; enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR; struct samr_DomInfo1 *dominfo = NULL; struct ldb_context *samdb; struct ldb_message *msg; krb5_context context = kdc->smb_krb5_context->krb5_context; ChangePasswdDataMS chpw; DATA_BLOB password; krb5_principal principal; char *set_password_on_princ; struct ldb_dn *set_password_on_dn; size_t len; int ret; msg = ldb_msg_new(mem_ctx); if (!msg) { return false; } ret = decode_ChangePasswdDataMS(input->data, input->length, &chpw, &len); if (ret) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_MALFORMED, "failed to decode password change structure", reply); } if (!convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), CH_UTF8, CH_UTF16, (const char *)chpw.newpasswd.data, chpw.newpasswd.length, (void **)&password.data, &pw_len, false)) { free_ChangePasswdDataMS(&chpw); return false; } password.length = pw_len; if ((chpw.targname && !chpw.targrealm) || (!chpw.targname && chpw.targrealm)) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_MALFORMED, "Realm and principal must be both present, or neither present", reply); } if (chpw.targname && chpw.targrealm) { #ifdef SAMBA4_INTERNAL_HEIMDAL if (_krb5_principalname2krb5_principal(kdc->smb_krb5_context->krb5_context, &principal, *chpw.targname, *chpw.targrealm) != 0) { free_ChangePasswdDataMS(&chpw); return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_MALFORMED, "failed to extract principal to set", reply); } #else /* SAMBA4_INTERNAL_HEIMDAL */ return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_BAD_VERSION, "Operation Not Implemented", reply); #endif /* SAMBA4_INTERNAL_HEIMDAL */ } else { free_ChangePasswdDataMS(&chpw); return kpasswdd_change_password(kdc, mem_ctx, session_info, &password, reply); } free_ChangePasswdDataMS(&chpw); if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) { krb5_free_principal(context, principal); return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_MALFORMED, "krb5_unparse_name failed!", reply); } krb5_free_principal(context, principal); samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info); if (!samdb) { return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_HARDERROR, "Unable to open database!", reply); } DEBUG(3, ("%s\\%s (%s) is changing password of %s\n", session_info->server_info->domain_name, session_info->server_info->account_name, dom_sid_string(mem_ctx, session_info->security_token->user_sid), set_password_on_princ)); ret = ldb_transaction_start(samdb); if (ret) { status = NT_STATUS_TRANSACTION_ABORTED; return kpasswd_make_pwchange_reply(kdc, mem_ctx, status, SAM_PWD_CHANGE_NO_ERROR, NULL, reply); } status = crack_user_principal_name(samdb, mem_ctx, set_password_on_princ, &set_password_on_dn, NULL); free(set_password_on_princ); if (!NT_STATUS_IS_OK(status)) { ldb_transaction_cancel(samdb); return kpasswd_make_pwchange_reply(kdc, mem_ctx, status, SAM_PWD_CHANGE_NO_ERROR, NULL, reply); } msg = ldb_msg_new(mem_ctx); if (msg == NULL) { ldb_transaction_cancel(samdb); status = NT_STATUS_NO_MEMORY; } else { msg->dn = ldb_dn_copy(msg, set_password_on_dn); if (!msg->dn) { status = NT_STATUS_NO_MEMORY; } } if (NT_STATUS_IS_OK(status)) { /* Admin password set */ status = samdb_set_password(samdb, mem_ctx, set_password_on_dn, NULL, msg, &password, NULL, NULL, false, /* this is not a user password change */ &reject_reason, &dominfo); } if (NT_STATUS_IS_OK(status)) { /* modify the samdb record */ ret = samdb_replace(samdb, mem_ctx, msg); if (ret != 0) { DEBUG(2,("Failed to modify record to set password on %s: %s\n", ldb_dn_get_linearized(msg->dn), ldb_errstring(samdb))); status = NT_STATUS_ACCESS_DENIED; } } if (NT_STATUS_IS_OK(status)) { ret = ldb_transaction_commit(samdb); if (ret != 0) { DEBUG(1,("Failed to commit transaction to set password on %s: %s\n", ldb_dn_get_linearized(msg->dn), ldb_errstring(samdb))); status = NT_STATUS_TRANSACTION_ABORTED; } } else { ldb_transaction_cancel(samdb); } return kpasswd_make_pwchange_reply(kdc, mem_ctx, status, reject_reason, dominfo, reply); } default: return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_BAD_VERSION, talloc_asprintf(mem_ctx, "Protocol version %u not supported", version), reply); } return true; }