Add sm_sec_req_auto_pair: configurable auto-pairing on Security Request - #1181
Add sm_sec_req_auto_pair: configurable auto-pairing on Security Request#1181tonywestonuk wants to merge 1 commit into
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughArrr, this change adds a public setting for automatic pairing after a peer Security Request. The setting is enabled by default and applies when no stored keys exist. ChangesSecurity Request Pairing
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Disabling automatic pairing can cause a peer’s security request to be ignored when key storage cannot be read, potentially leaving the connection unsecured. The change is otherwise mergeable with explicit owner awareness or follow-up for this bounded failure case. Sequence Diagram(s)sequenceDiagram
participant Peer
participant ble_sm_sec_req_rx
participant ble_hs_cfg
Peer->>ble_sm_sec_req_rx: Send Security Request
ble_sm_sec_req_rx->>ble_hs_cfg: Check sm_sec_req_auto_pair
alt Enabled
ble_sm_sec_req_rx->>Peer: Start pairing
else Disabled
ble_sm_sec_req_rx-->>Peer: Return successfully without pairing
end
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Inline comments:
In `@src/nimble/nimble/host/src/ble_sm.c`:
- Around line 2093-2099: Update the Security Request handling around
ble_store_read_peer_sec() so the no-keys pairing path is entered only for
BLE_HS_ENOENT. When sm_sec_req_auto_pair is false, preserve BLE_HS_ENOENT
behavior but return or propagate other nonzero store errors before
ble_sm_enc_initiate(), rather than clearing them via app_status.
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src/NimBLEDevice.cppsrc/NimBLEDevice.hsrc/nimble/nimble/host/include/host/ble_hs.hsrc/nimble/nimble/host/src/ble_hs_cfg.csrc/nimble/nimble/host/src/ble_sm.csrc/syscfg/syscfg.h
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…gurable On a Security Request from a peer we have no keys for, the host sends a Pairing Request immediately from ble_sm_sec_req_rx(). Some peripherals never answer a Pairing Request sent in the same instant as their own Security Request (e.g. the Okida OT-2000 oven module: no Pairing Response, link dropped after its 30 s SMP timeout). They pair first try with Bluedroid, macOS and iOS, which leave initiation to the application. Core Spec Vol 3, Part H, 2.4.6 says the central "may" initiate pairing on a Security Request. Make it configurable: ble_hs_cfg.sm_sec_req_auto_pair (syscfg BLE_SM_SEC_REQ_AUTO_PAIR, default 1 = unchanged). When cleared the request is ignored and the application initiates pairing, e.g. via NimBLEClient::secureConnection(). Peers we have keys for are unaffected. Exposed as NimBLEDevice::setSecurityAutoPairOnSecReq(). Verified on ESP32-C3 / arduino-esp32 3.3.11: the oven pairs with the flag cleared; with stock behaviour it fails regardless of MTU exchange, connection interval, key distribution, address type or SC/legacy.
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Fixes #1182 |
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When a peripheral we have no keys for sends an SMP Security Request, the host currently sends a Pairing Request immediately, synchronously from ble_sm_sec_req_rx(), with no way for the application to intervene.
Some peripherals (e.g. the Okida OT-2000 oven timer module, BLE 4.0 era) cannot handle a Pairing Request arriving in the same instant as their own Security Request: they never send a Pairing Response. The same devices pair on the first attempt with Bluedroid, macOS and iOS, which hand the Security Request to the application and initiate pairing a few milliseconds later.
Core Spec Vol 3, Part H, 2.4.6 leaves this to the central ("may"). This adds ble_hs_cfg.sm_sec_req_auto_pair (syscfg BLE_SM_SEC_REQ_AUTO_PAIR, default 1 = unchanged behaviour). When cleared, a Security Request from a peer we have no keys for is ignored and the application initiates pairing itself, e.g. via NimBLEClient::secureConnection(). Peers we already have keys for are handled exactly as before. Exposed as NimBLEDevice::setSecurityAutoPairOnSecReq().
Verified on ESP32-C3 / arduino-esp32 3.3.11: with the flag cleared the oven pairs first try; with stock behaviour it fails regardless of MTU exchange, connection interval, key distribution, address type or SC/legacy choice.
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