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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "Privacy.h"
     18 
     19 #include <android/os/IncidentReportArgs.h>
     20 #include <stdlib.h>
     21 #include <strstream>
     22 
     23 
     24 namespace android {
     25 namespace os {
     26 namespace incidentd {
     27 
     28 using namespace android::os;
     29 using std::strstream;
     30 
     31 uint64_t encode_field_id(const Privacy* p) { return (uint64_t)p->type << 32 | p->field_id; }
     32 
     33 string Privacy::toString() const {
     34     if (this == NULL) {
     35         return "Privacy{null}";
     36     }
     37     strstream os;
     38     os << "Privacy{field_id=" << field_id << " type=" << ((int)type)
     39             << " children=" << ((void*)children) << " policy=" << ((int)policy) << "}";
     40     return os.str();
     41 }
     42 
     43 const Privacy* lookup(const Privacy* p, uint32_t fieldId) {
     44     if (p->children == NULL) return NULL;
     45     for (int i = 0; p->children[i] != NULL; i++) {  // NULL-terminated.
     46         if (p->children[i]->field_id == fieldId) return p->children[i];
     47         // Incident section gen tool guarantees field ids in ascending order.
     48         if (p->children[i]->field_id > fieldId) return NULL;
     49     }
     50     return NULL;
     51 }
     52 
     53 static bool isAllowed(const uint8_t policy, const uint8_t check) {
     54     switch (check) {
     55         case PRIVACY_POLICY_LOCAL:
     56             return policy == PRIVACY_POLICY_LOCAL;
     57         case PRIVACY_POLICY_EXPLICIT:
     58         case PRIVACY_POLICY_UNSET:
     59             return policy == PRIVACY_POLICY_LOCAL
     60                     || policy == PRIVACY_POLICY_EXPLICIT
     61                     || policy == PRIVACY_POLICY_UNSET;
     62         case PRIVACY_POLICY_AUTOMATIC:
     63             return true;
     64         default:
     65             return false;
     66     }
     67 }
     68 
     69 PrivacySpec::PrivacySpec(uint8_t argPolicy) {
     70     // TODO: Why on earth do we have two definitions of policy.  Maybe
     71     // it's not too late to clean this up.
     72     switch (argPolicy) {
     73         case android::os::PRIVACY_POLICY_AUTOMATIC:
     74         case android::os::PRIVACY_POLICY_EXPLICIT:
     75         case android::os::PRIVACY_POLICY_LOCAL:
     76             mPolicy = argPolicy;
     77             break;
     78         default:
     79             mPolicy = android::os::PRIVACY_POLICY_AUTOMATIC;
     80             break;
     81     }
     82 }
     83 
     84 bool PrivacySpec::operator<(const PrivacySpec& that) const {
     85     return mPolicy < that.mPolicy;
     86 }
     87 
     88 bool PrivacySpec::CheckPremission(const Privacy* privacy, const uint8_t defaultDest) const {
     89     uint8_t check = privacy != NULL ? privacy->policy : defaultDest;
     90     return isAllowed(mPolicy, check);
     91 }
     92 
     93 bool PrivacySpec::RequireAll() const {
     94     return mPolicy == android::os::PRIVACY_POLICY_LOCAL;
     95 }
     96 
     97 uint8_t cleanup_privacy_policy(uint8_t policy) {
     98     if (policy >= PRIVACY_POLICY_AUTOMATIC) {
     99         return PRIVACY_POLICY_AUTOMATIC;
    100     }
    101     if (policy >= PRIVACY_POLICY_EXPLICIT) {
    102         return PRIVACY_POLICY_EXPLICIT;
    103     }
    104     return PRIVACY_POLICY_LOCAL;
    105 }
    106 
    107 }  // namespace incidentd
    108 }  // namespace os
    109 }  // namespace android
    110