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In-Reply-To: <20200215114408.Bluez.v4.1.I333a90ad3c75882c6f008c94a28ca7d3e8f6c76e@changeid>
From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Tue, 18 Feb 2020 10:22:02 -0800
Message-ID: <CABBYNZ+tiW-FT5QxNCbCb4ZpmuZ-GqqW18_atdHbBHLCzr6URQ@mail.gmail.com>
Subject: Re: [Bluez PATCH v4] core: Add new policy for Just-Works repairing
To:     Howard Chung <howardchung@google.com>
Cc:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
        Luiz Augusto Von Dentz <luiz.von.dentz@intel.com>,
        ChromeOS Bluetooth Upstreaming 
        <chromeos-bluetooth-upstreaming@chromium.org>
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Sender: linux-bluetooth-owner@vger.kernel.org
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Hi Howard,

On Fri, Feb 14, 2020 at 7:49 PM Howard Chung <howardchung@google.com> wrote:
>
> From: "howardchung@google.com" <howardchung@google.com>
>
> When kernel find out that the incoming Just-Works pairing is
> initiated by a paired device, it is user space's responsibility to
> decide the next action.
>
> This patch includes the following:
> - add JustWorksRepairing policy as an option in main.conf
> - handle the confirmation request from kernel
> ---
> The Just-Works repairing policy could be one of the following:
> - never: default; reject the repairing immediately.
> - confirm: prompt a confirmation dialog to user.
> - always: always accept the repairing.
>
> Changes in v4:
> - optimize the code in src/device.c
>
> Changes in v3:
> - move the check from src/agent.c to src/device.c
> - fix the enum declaration in src/hcid.h
>
> Changes in v2:
> - let RequestAuthorization handle the situation
> - remove the changes in client/
>
>  src/device.c  | 15 +++++++++++++++
>  src/hcid.h    |  8 ++++++++
>  src/main.c    | 27 +++++++++++++++++++++++++++
>  src/main.conf |  5 +++++
>  4 files changed, 55 insertions(+)
>
> diff --git a/src/device.c b/src/device.c
> index a4fe10980..a8f4c22f3 100644
> --- a/src/device.c
> +++ b/src/device.c
> @@ -6141,6 +6141,21 @@ int device_confirm_passkey(struct btd_device *device, uint8_t type,
>         struct authentication_req *auth;
>         int err;
>
> +       /* Just-Works repairing policy */
> +       if (confirm_hint && device_is_paired(device, type)) {
> +               if (main_opts.jw_repairing == JW_REPAIRING_NEVER) {
> +                       btd_adapter_confirm_reply(device->adapter,
> +                                                 &device->bdaddr,
> +                                                 type, FALSE);
> +                       return 0;
> +               } else if (main_opts.jw_repairing == JW_REPAIRING_ALWAYS) {
> +                       btd_adapter_confirm_reply(device->adapter,
> +                                                 &device->bdaddr,
> +                                                 type, TRUE);
> +                       return 0;
> +               }
> +       }
> +
>         auth = new_auth(device, type, AUTH_TYPE_CONFIRM, FALSE);
>         if (!auth)
>                 return -EPERM;
> diff --git a/src/hcid.h b/src/hcid.h
> index adea85ce2..ca405fde4 100644
> --- a/src/hcid.h
> +++ b/src/hcid.h
> @@ -35,6 +35,12 @@ typedef enum {
>         BT_GATT_CACHE_NO,
>  } bt_gatt_cache_t;
>
> +enum jw_repairing_t {
> +       JW_REPAIRING_NEVER,
> +       JW_REPAIRING_CONFIRM,
> +       JW_REPAIRING_ALWAYS,
> +};
> +
>  struct main_opts {
>         char            *name;
>         uint32_t        class;
> @@ -58,6 +64,8 @@ struct main_opts {
>         uint16_t        gatt_mtu;
>
>         uint8_t         key_size;
> +
> +       enum jw_repairing_t jw_repairing;
>  };
>
>  extern struct main_opts main_opts;
> diff --git a/src/main.c b/src/main.c
> index 1a6ab36a3..fc8c869fc 100644
> --- a/src/main.c
> +++ b/src/main.c
> @@ -93,6 +93,7 @@ static const char *supported_options[] = {
>         "MultiProfile",
>         "FastConnectable",
>         "Privacy",
> +       "JustWorksRepairing",
>         NULL
>  };
>
> @@ -193,6 +194,20 @@ static bt_gatt_cache_t parse_gatt_cache(const char *cache)
>         }
>  }
>
> +static enum jw_repairing_t parse_jw_repairing(const char *jw_repairing)
> +{
> +       if (!strcmp(jw_repairing, "never")) {
> +               return JW_REPAIRING_NEVER;
> +       } else if (!strcmp(jw_repairing, "confirm")) {
> +               return JW_REPAIRING_CONFIRM;
> +       } else if (!strcmp(jw_repairing, "always")) {
> +               return JW_REPAIRING_ALWAYS;
> +       } else {
> +               return JW_REPAIRING_NEVER;
> +       }
> +}
> +
> +
>  static void check_options(GKeyFile *config, const char *group,
>                                                 const char **options)
>  {
> @@ -331,6 +346,18 @@ static void parse_config(GKeyFile *config)
>                 g_free(str);
>         }
>
> +       str = g_key_file_get_string(config, "General",
> +                                               "JustWorksRepairing", &err);
> +       if (err) {
> +               DBG("%s", err->message);
> +               g_clear_error(&err);
> +               main_opts.jw_repairing = JW_REPAIRING_NEVER;
> +       } else {
> +               DBG("just_works_repairing=%s", str);
> +               main_opts.jw_repairing = parse_jw_repairing(str);
> +               g_free(str);
> +       }
> +
>         str = g_key_file_get_string(config, "General", "Name", &err);
>         if (err) {
>                 DBG("%s", err->message);
> diff --git a/src/main.conf b/src/main.conf
> index 40687a755..bb5ff5b15 100644
> --- a/src/main.conf
> +++ b/src/main.conf
> @@ -72,6 +72,11 @@
>  # Defaults to "off"
>  # Privacy = off
>
> +# Specify the policy to the JUST-WORKS repairing initiated by peer
> +# Possible values: "never", "confirm", "always"
> +# Defaults to "never"
> +#JustWorksRepairing = never
> +
>  [GATT]
>  # GATT attribute cache.
>  # Possible values:
> --
> 2.25.0.265.gbab2e86ba0-goog

Applied, thanks.

-- 
Luiz Augusto von Dentz