| Avi Drissman | 201a9a83 | 2022-09-13 19:39:25 | [diff] [blame] | 1 | // Copyright 2020 The Chromium Authors |
| Michael Ershov | 1c50ac95 | 2020-12-02 21:01:17 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "crypto/chaps_support.h" |
| 6 | |
| 7 | #include <dlfcn.h> |
| Michael Ershov | d9a627e | 2021-11-03 13:55:27 | [diff] [blame] | 8 | #include <secmod.h> |
| Michael Ershov | 1c50ac95 | 2020-12-02 21:01:17 | [diff] [blame] | 9 | #include <secmodt.h> |
| 10 | |
| 11 | #include "base/logging.h" |
| 12 | #include "base/threading/scoped_blocking_call.h" |
| Michael Ershov | d9a627e | 2021-11-03 13:55:27 | [diff] [blame] | 13 | #include "crypto/scoped_nss_types.h" |
| Michael Ershov | 1c50ac95 | 2020-12-02 21:01:17 | [diff] [blame] | 14 | #include "nss_util_internal.h" |
| 15 | |
| 16 | namespace crypto { |
| 17 | |
| 18 | namespace { |
| 19 | |
| 20 | // Constants for loading the Chrome OS TPM-backed PKCS #11 library. |
| 21 | const char kChapsModuleName[] = "Chaps"; |
| 22 | const char kChapsPath[] = "libchaps.so"; |
| 23 | |
| 24 | class ScopedChapsLoadFixup { |
| 25 | public: |
| 26 | ScopedChapsLoadFixup(); |
| 27 | ~ScopedChapsLoadFixup(); |
| 28 | |
| 29 | private: |
| 30 | #if defined(COMPONENT_BUILD) |
| 31 | void* chaps_handle_; |
| 32 | #endif |
| 33 | }; |
| 34 | |
| 35 | #if defined(COMPONENT_BUILD) |
| 36 | |
| 37 | ScopedChapsLoadFixup::ScopedChapsLoadFixup() { |
| 38 | // HACK: libchaps links the system protobuf and there are symbol conflicts |
| 39 | // with the bundled copy. Load chaps with RTLD_DEEPBIND to workaround. |
| 40 | chaps_handle_ = dlopen(kChapsPath, RTLD_LOCAL | RTLD_NOW | RTLD_DEEPBIND); |
| 41 | } |
| 42 | |
| 43 | ScopedChapsLoadFixup::~ScopedChapsLoadFixup() { |
| 44 | // LoadNSSModule() will have taken a 2nd reference. |
| 45 | if (chaps_handle_) |
| 46 | dlclose(chaps_handle_); |
| 47 | } |
| 48 | |
| 49 | #else |
| 50 | |
| 51 | ScopedChapsLoadFixup::ScopedChapsLoadFixup() = default; |
| 52 | ScopedChapsLoadFixup::~ScopedChapsLoadFixup() = default; |
| 53 | |
| 54 | #endif // defined(COMPONENT_BUILD) |
| 55 | |
| 56 | } // namespace |
| 57 | |
| 58 | SECMODModule* LoadChaps() { |
| 59 | // NSS functions may reenter //net via extension hooks. If the reentered |
| 60 | // code needs to synchronously wait for a task to run but the thread pool in |
| 61 | // which that task must run doesn't have enough threads to schedule it, a |
| 62 | // deadlock occurs. To prevent that, the base::ScopedBlockingCall below |
| 63 | // increments the thread pool capacity for the duration of the TPM |
| 64 | // initialization. |
| 65 | base::ScopedBlockingCall scoped_blocking_call(FROM_HERE, |
| 66 | base::BlockingType::WILL_BLOCK); |
| 67 | |
| 68 | ScopedChapsLoadFixup chaps_loader; |
| 69 | |
| 70 | DVLOG(3) << "Loading chaps..."; |
| 71 | return LoadNSSModule( |
| 72 | kChapsModuleName, kChapsPath, |
| 73 | // For more details on these parameters, see: |
| 74 | // https://developer.mozilla.org/en/PKCS11_Module_Specs |
| 75 | // slotFlags=[PublicCerts] -- Certificates and public keys can be |
| 76 | // read from this slot without requiring a call to C_Login. |
| 77 | // askpw=only -- Only authenticate to the token when necessary. |
| 78 | "NSS=\"slotParams=(0={slotFlags=[PublicCerts] askpw=only})\""); |
| 79 | } |
| 80 | |
| Michael Ershov | d9a627e | 2021-11-03 13:55:27 | [diff] [blame] | 81 | ScopedPK11Slot GetChapsSlot(SECMODModule* chaps_module, CK_SLOT_ID slot_id) { |
| 82 | DCHECK(chaps_module); |
| 83 | |
| 84 | // NSS functions may reenter //net via extension hooks. If the reentered |
| 85 | // code needs to synchronously wait for a task to run but the thread pool in |
| 86 | // which that task must run doesn't have enough threads to schedule it, a |
| 87 | // deadlock occurs. To prevent that, the base::ScopedBlockingCall below |
| 88 | // increments the thread pool capacity for the duration of the TPM |
| 89 | // initialization. |
| 90 | base::ScopedBlockingCall scoped_blocking_call(FROM_HERE, |
| 91 | base::BlockingType::WILL_BLOCK); |
| 92 | |
| 93 | DVLOG(3) << "Poking chaps module."; |
| 94 | SECStatus rv = SECMOD_UpdateSlotList(chaps_module); |
| 95 | if (rv != SECSuccess) |
| 96 | LOG(ERROR) << "SECMOD_UpdateSlotList failed: " << PORT_GetError(); |
| 97 | |
| 98 | ScopedPK11Slot slot = |
| 99 | ScopedPK11Slot(SECMOD_LookupSlot(chaps_module->moduleID, slot_id)); |
| 100 | if (!slot) |
| 101 | LOG(ERROR) << "TPM slot " << slot_id << " not found."; |
| 102 | return slot; |
| 103 | } |
| 104 | |
| Michael Ershov | 1c50ac95 | 2020-12-02 21:01:17 | [diff] [blame] | 105 | bool IsSlotProvidedByChaps(PK11SlotInfo* slot) { |
| 106 | if (!slot) |
| 107 | return false; |
| 108 | |
| 109 | SECMODModule* pk11_module = PK11_GetModule(slot); |
| 110 | return pk11_module && base::StringPiece(pk11_module->commonName) == |
| 111 | base::StringPiece(kChapsModuleName); |
| 112 | } |
| 113 | |
| 114 | } // namespace crypto |