diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/admin_api/register_api.md | 6 | ||||
| -rw-r--r-- | docs/auth_chain_difference_algorithm.md | 51 | ||||
| -rw-r--r-- | docs/openid.md | 4 | ||||
| -rw-r--r-- | docs/setup/installation.md | 23 | ||||
| -rw-r--r-- | docs/usage/configuration/config_documentation.md | 233 | ||||
| -rw-r--r-- | docs/workers.md | 5 |
6 files changed, 207 insertions, 115 deletions
diff --git a/docs/admin_api/register_api.md b/docs/admin_api/register_api.md index d7b7cf6a76..f6be31b443 100644 --- a/docs/admin_api/register_api.md +++ b/docs/admin_api/register_api.md @@ -5,9 +5,9 @@ non-interactive way. This is generally used for bootstrapping a Synapse instance with administrator accounts. To authenticate yourself to the server, you will need both the shared secret -(`registration_shared_secret` in the homeserver configuration), and a -one-time nonce. If the registration shared secret is not configured, this API -is not enabled. +([`registration_shared_secret`](../configuration/config_documentation.md#registration_shared_secret) +in the homeserver configuration), and a one-time nonce. If the registration +shared secret is not configured, this API is not enabled. To fetch the nonce, you need to request one from the API: diff --git a/docs/auth_chain_difference_algorithm.md b/docs/auth_chain_difference_algorithm.md index 30f72a70da..ebc9de25b8 100644 --- a/docs/auth_chain_difference_algorithm.md +++ b/docs/auth_chain_difference_algorithm.md @@ -34,13 +34,45 @@ the process of indexing it). ## Chain Cover Index Synapse computes auth chain differences by pre-computing a "chain cover" index -for the auth chain in a room, allowing efficient reachability queries like "is -event A in the auth chain of event B". This is done by assigning every event a -*chain ID* and *sequence number* (e.g. `(5,3)`), and having a map of *links* -between chains (e.g. `(5,3) -> (2,4)`) such that A is reachable by B (i.e. `A` -is in the auth chain of `B`) if and only if either: - -1. A and B have the same chain ID and `A`'s sequence number is less than `B`'s +for the auth chain in a room, allowing us to efficiently make reachability queries +like "is event `A` in the auth chain of event `B`?". We could do this with an index +that tracks all pairs `(A, B)` such that `A` is in the auth chain of `B`. However, this +would be prohibitively large, scaling poorly as the room accumulates more state +events. + +Instead, we break down the graph into *chains*. A chain is a subset of a DAG +with the following property: for any pair of events `E` and `F` in the chain, +the chain contains a path `E -> F` or a path `F -> E`. This forces a chain to be +linear (without forks), e.g. `E -> F -> G -> ... -> H`. Each event in the chain +is given a *sequence number* local to that chain. The oldest event `E` in the +chain has sequence number 1. If `E` has a child `F` in the chain, then `F` has +sequence number 2. If `E` has a grandchild `G` in the chain, then `G` has +sequence number 3; and so on. + +Synapse ensures that each persisted event belongs to exactly one chain, and +tracks how the chains are connected to one another. This allows us to +efficiently answer reachability queries. Doing so uses less storage than +tracking reachability on an event-by-event basis, particularly when we have +fewer and longer chains. See + +> Jagadish, H. (1990). [A compression technique to materialize transitive closure](https://doi.org/10.1145/99935.99944). +> *ACM Transactions on Database Systems (TODS)*, 15*(4)*, 558-598. + +for the original idea or + +> Y. Chen, Y. Chen, [An efficient algorithm for answering graph +> reachability queries](https://doi.org/10.1109/ICDE.2008.4497498), +> in: 2008 IEEE 24th International Conference on Data Engineering, April 2008, +> pp. 893–902. (PDF available via [Google Scholar](https://scholar.google.com/scholar?q=Y.%20Chen,%20Y.%20Chen,%20An%20efficient%20algorithm%20for%20answering%20graph%20reachability%20queries,%20in:%202008%20IEEE%2024th%20International%20Conference%20on%20Data%20Engineering,%20April%202008,%20pp.%20893902.).) + +for a more modern take. + +In practical terms, the chain cover assigns every event a +*chain ID* and *sequence number* (e.g. `(5,3)`), and maintains a map of *links* +between events in chains (e.g. `(5,3) -> (2,4)`) such that `A` is reachable by `B` +(i.e. `A` is in the auth chain of `B`) if and only if either: + +1. `A` and `B` have the same chain ID and `A`'s sequence number is less than `B`'s sequence number; or 2. there is a link `L` between `B`'s chain ID and `A`'s chain ID such that `L.start_seq_no` <= `B.seq_no` and `A.seq_no` <= `L.end_seq_no`. @@ -49,8 +81,9 @@ There are actually two potential implementations, one where we store links from each chain to every other reachable chain (the transitive closure of the links graph), and one where we remove redundant links (the transitive reduction of the links graph) e.g. if we have chains `C3 -> C2 -> C1` then the link `C3 -> C1` -would not be stored. Synapse uses the former implementations so that it doesn't -need to recurse to test reachability between chains. +would not be stored. Synapse uses the former implementation so that it doesn't +need to recurse to test reachability between chains. This trades-off extra storage +in order to save CPU cycles and DB queries. ### Example diff --git a/docs/openid.md b/docs/openid.md index d0ccf36f71..ce9b026228 100644 --- a/docs/openid.md +++ b/docs/openid.md @@ -174,7 +174,9 @@ oidc_providers: 1. Create a regular web application for Synapse 2. Set the Allowed Callback URLs to `[synapse public baseurl]/_synapse/client/oidc/callback` -3. Add a rule to add the `preferred_username` claim. +3. Add a rule with any name to add the `preferred_username` claim. +(See https://auth0.com/docs/customize/rules/create-rules for more information on how to create rules.) + <details> <summary>Code sample</summary> diff --git a/docs/setup/installation.md b/docs/setup/installation.md index 260e50577b..bb78b3267a 100644 --- a/docs/setup/installation.md +++ b/docs/setup/installation.md @@ -506,9 +506,13 @@ email will be disabled. ### Registering a user -The easiest way to create a new user is to do so from a client like [Element](https://element.io/). +One way to create a new user is to do so from a client like +[Element](https://element.io/). This requires registration to be enabled via +the +[`enable_registration`](../usage/configuration/config_documentation.md#enable_registration) +setting. -Alternatively, you can do so from the command line. This can be done as follows: +Alternatively, you can create new users from the command line. This can be done as follows: 1. If synapse was installed via pip, activate the virtualenv as follows (if Synapse was installed via a prebuilt package, `register_new_matrix_user` should already be @@ -520,7 +524,7 @@ Alternatively, you can do so from the command line. This can be done as follows: ``` 2. Run the following command: ```sh - register_new_matrix_user -c homeserver.yaml http://localhost:8008 + register_new_matrix_user -c homeserver.yaml ``` This will prompt you to add details for the new user, and will then connect to @@ -533,12 +537,13 @@ Make admin [no]: Success! ``` -This process uses a setting `registration_shared_secret` in -`homeserver.yaml`, which is shared between Synapse itself and the -`register_new_matrix_user` script. It doesn't matter what it is (a random -value is generated by `--generate-config`), but it should be kept secret, as -anyone with knowledge of it can register users, including admin accounts, -on your server even if `enable_registration` is `false`. +This process uses a setting +[`registration_shared_secret`](../usage/configuration/config_documentation.md#registration_shared_secret), +which is shared between Synapse itself and the `register_new_matrix_user` +script. It doesn't matter what it is (a random value is generated by +`--generate-config`), but it should be kept secret, as anyone with knowledge of +it can register users, including admin accounts, on your server even if +`enable_registration` is `false`. ### Setting up a TURN server diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md index 8ae018e628..c0cfe5dcea 100644 --- a/docs/usage/configuration/config_documentation.md +++ b/docs/usage/configuration/config_documentation.md @@ -1873,8 +1873,8 @@ See [here](../../CAPTCHA_SETUP.md) for full details on setting up captcha. --- ### `recaptcha_public_key` -This homeserver's ReCAPTCHA public key. Must be specified if `enable_registration_captcha` is -enabled. +This homeserver's ReCAPTCHA public key. Must be specified if +[`enable_registration_captcha`](#enable_registration_captcha) is enabled. Example configuration: ```yaml @@ -1883,7 +1883,8 @@ recaptcha_public_key: "YOUR_PUBLIC_KEY" --- ### `recaptcha_private_key` -This homeserver's ReCAPTCHA private key. Must be specified if `enable_registration_captcha` is +This homeserver's ReCAPTCHA private key. Must be specified if +[`enable_registration_captcha`](#enable_registration_captcha) is enabled. Example configuration: @@ -1893,9 +1894,11 @@ recaptcha_private_key: "YOUR_PRIVATE_KEY" --- ### `enable_registration_captcha` -Set to true to enable ReCaptcha checks when registering, preventing signup -unless a captcha is answered. Requires a valid ReCaptcha public/private key. -Defaults to false. +Set to `true` to require users to complete a CAPTCHA test when registering an account. +Requires a valid ReCaptcha public/private key. +Defaults to `false`. + +Note that [`enable_registration`](#enable_registration) must also be set to allow account registration. Example configuration: ```yaml @@ -1971,98 +1974,43 @@ Registration can be rate-limited using the parameters in the [Ratelimiting](#rat --- ### `enable_registration` -Enable registration for new users. Defaults to false. It is highly recommended that if you enable registration, -you use either captcha, email, or token-based verification to verify that new users are not bots. In order to enable registration -without any verification, you must also set `enable_registration_without_verification` to true. - -Example configuration: -```yaml -enable_registration: true -``` ---- -### `enable_registration_without_verification` -Enable registration without email or captcha verification. Note: this option is *not* recommended, -as registration without verification is a known vector for spam and abuse. Defaults to false. Has no effect -unless `enable_registration` is also enabled. - -Example configuration: -```yaml -enable_registration_without_verification: true -``` ---- -### `session_lifetime` - -Time that a user's session remains valid for, after they log in. - -Note that this is not currently compatible with guest logins. +Enable registration for new users. Defaults to `false`. -Note also that this is calculated at login time: changes are not applied retrospectively to users who have already -logged in. +It is highly recommended that if you enable registration, you set one or more +or the following options, to avoid abuse of your server by "bots": -By default, this is infinite. + * [`enable_registration_captcha`](#enable_registration_captcha) + * [`registrations_require_3pid`](#registrations_require_3pid) + * [`registration_requires_token`](#registration_requires_token) -Example configuration: -```yaml -session_lifetime: 24h -``` ----- -### `refresh_access_token_lifetime` +(In order to enable registration without any verification, you must also set +[`enable_registration_without_verification`](#enable_registration_without_verification).) -Time that an access token remains valid for, if the session is using refresh tokens. - -For more information about refresh tokens, please see the [manual](user_authentication/refresh_tokens.md). - -Note that this only applies to clients which advertise support for refresh tokens. - -Note also that this is calculated at login time and refresh time: changes are not applied to -existing sessions until they are refreshed. - -By default, this is 5 minutes. +Note that even if this setting is disabled, new accounts can still be created +via the admin API if +[`registration_shared_secret`](#registration_shared_secret) is set. Example configuration: ```yaml -refreshable_access_token_lifetime: 10m -``` ---- -### `refresh_token_lifetime: 24h` - -Time that a refresh token remains valid for (provided that it is not -exchanged for another one first). -This option can be used to automatically log-out inactive sessions. -Please see the manual for more information. - -Note also that this is calculated at login time and refresh time: -changes are not applied to existing sessions until they are refreshed. - -By default, this is infinite. - -Example configuration: -```yaml -refresh_token_lifetime: 24h +enable_registration: true ``` --- -### `nonrefreshable_access_token_lifetime` - -Time that an access token remains valid for, if the session is NOT -using refresh tokens. - -Please note that not all clients support refresh tokens, so setting -this to a short value may be inconvenient for some users who will -then be logged out frequently. - -Note also that this is calculated at login time: changes are not applied -retrospectively to existing sessions for users that have already logged in. +### `enable_registration_without_verification` -By default, this is infinite. +Enable registration without email or captcha verification. Note: this option is *not* recommended, +as registration without verification is a known vector for spam and abuse. Defaults to `false`. Has no effect +unless [`enable_registration`](#enable_registration) is also enabled. Example configuration: ```yaml -nonrefreshable_access_token_lifetime: 24h +enable_registration_without_verification: true ``` --- ### `registrations_require_3pid` -If this is set, the user must provide all of the specified types of 3PID when registering. +If this is set, users must provide all of the specified types of 3PID when registering an account. + +Note that [`enable_registration`](#enable_registration) must also be set to allow account registration. Example configuration: ```yaml @@ -2110,9 +2058,11 @@ enable_3pid_lookup: false Require users to submit a token during registration. Tokens can be managed using the admin [API](../administration/admin_api/registration_tokens.md). -Note that `enable_registration` must be set to true. Disabling this option will not delete any tokens previously generated. -Defaults to false. Set to true to enable. +Defaults to `false`. Set to `true` to enable. + + +Note that [`enable_registration`](#enable_registration) must also be set to allow account registration. Example configuration: ```yaml @@ -2121,13 +2071,39 @@ registration_requires_token: true --- ### `registration_shared_secret` -If set, allows registration of standard or admin accounts by anyone who -has the shared secret, even if registration is otherwise disabled. +If set, allows registration of standard or admin accounts by anyone who has the +shared secret, even if [`enable_registration`](#enable_registration) is not +set. + +This is primarily intended for use with the `register_new_matrix_user` script +(see [Registering a user](../../setup/installation.md#registering-a-user)); +however, the interface is [documented](../admin_api/register_api.html). + +See also [`registration_shared_secret_path`](#registration_shared_secret_path). Example configuration: ```yaml registration_shared_secret: <PRIVATE STRING> ``` + +--- +### `registration_shared_secret_path` + +An alternative to [`registration_shared_secret`](#registration_shared_secret): +allows the shared secret to be specified in an external file. + +The file should be a plain text file, containing only the shared secret. + +If this file does not exist, Synapse will create a new signing +key on startup and store it in this file. + +Example configuration: +```yaml +registration_shared_secret_file: /path/to/secrets/file +``` + +_Added in Synapse 1.67.0._ + --- ### `bcrypt_rounds` @@ -2359,6 +2335,79 @@ Example configuration: inhibit_user_in_use_error: true ``` --- +## User session management +--- +### `session_lifetime` + +Time that a user's session remains valid for, after they log in. + +Note that this is not currently compatible with guest logins. + +Note also that this is calculated at login time: changes are not applied retrospectively to users who have already +logged in. + +By default, this is infinite. + +Example configuration: +```yaml +session_lifetime: 24h +``` +---- +### `refresh_access_token_lifetime` + +Time that an access token remains valid for, if the session is using refresh tokens. + +For more information about refresh tokens, please see the [manual](user_authentication/refresh_tokens.md). + +Note that this only applies to clients which advertise support for refresh tokens. + +Note also that this is calculated at login time and refresh time: changes are not applied to +existing sessions until they are refreshed. + +By default, this is 5 minutes. + +Example configuration: +```yaml +refreshable_access_token_lifetime: 10m +``` +--- +### `refresh_token_lifetime: 24h` + +Time that a refresh token remains valid for (provided that it is not +exchanged for another one first). +This option can be used to automatically log-out inactive sessions. +Please see the manual for more information. + +Note also that this is calculated at login time and refresh time: +changes are not applied to existing sessions until they are refreshed. + +By default, this is infinite. + +Example configuration: +```yaml +refresh_token_lifetime: 24h +``` +--- +### `nonrefreshable_access_token_lifetime` + +Time that an access token remains valid for, if the session is NOT +using refresh tokens. + +Please note that not all clients support refresh tokens, so setting +this to a short value may be inconvenient for some users who will +then be logged out frequently. + +Note also that this is calculated at login time: changes are not applied +retrospectively to existing sessions for users that have already logged in. + +By default, this is infinite. + +Example configuration: +```yaml +nonrefreshable_access_token_lifetime: 24h +``` + +--- ## Metrics ### Config options related to metrics. @@ -2537,7 +2586,10 @@ Config options relating to signing keys --- ### `signing_key_path` -Path to the signing key to sign messages with. +Path to the signing key to sign events and federation requests with. + +*New in Synapse 1.67*: If this file does not exist, Synapse will create a new signing +key on startup and store it in this file. Example configuration: ```yaml @@ -2642,13 +2694,10 @@ key_server_signing_keys_path: "key_server_signing_keys.key" The following settings can be used to make Synapse use a single sign-on provider for authentication, instead of its internal password database. -You will probably also want to set the following options to false to +You will probably also want to set the following options to `false` to disable the regular login/registration flows: - * `enable_registration` - * `password_config.enabled` - -You will also want to investigate the settings under the "sso" configuration -section below. + * [`enable_registration`](#enable_registration) + * [`password_config.enabled`](#password_config) --- ### `saml2_config` diff --git a/docs/workers.md b/docs/workers.md index 6969c424d8..dce584972d 100644 --- a/docs/workers.md +++ b/docs/workers.md @@ -120,7 +120,10 @@ redis: See the sample config for the full documentation of each option. Under **no circumstances** should the replication listener be exposed to the -public internet; it has no authentication and is unencrypted. +public internet; replication traffic is: + +* always unencrypted +* unauthenticated, unless `worker_replication_secret` is configured ### Worker configuration |