upgrade.md

server](https://matrix.org/docs/spec/identity_service/r0.2.1)) to handle
sending confirmation messages via email and SMS.

So to delegate email verification, in `homeserver.yaml`, set
`account_threepid_delegates.email` to the base URL of an identity
server. For example:

```yaml
account_threepid_delegates:
    email: https://example.com     # Delegate email sending to example.com
```

Note that `account_threepid_delegates.email` replaces the deprecated
`email.trust_identity_server_for_password_resets`: if
`email.trust_identity_server_for_password_resets` is set to `true`, and
`account_threepid_delegates.email` is not set, then the first entry in
`trusted_third_party_id_servers` will be used as the
`account_threepid_delegate` for email. This is to ensure compatibility
with existing Synapse installs that set up external server handling for
these tasks before v1.4.0. If
`email.trust_identity_server_for_password_resets` is `true` and no
trusted identity server domains are configured, Synapse will report an
error and refuse to start.

If `email.trust_identity_server_for_password_resets` is `false` or
absent and no `email` delegate is configured in
`account_threepid_delegates`, then Synapse will send email verification
messages itself, using the configured SMTP server (see above). that
type.

### Phone numbers

Synapse does not support phone-number verification itself, so the only
way to maintain the ability for users to add phone numbers to their
accounts will be by continuing to delegate phone number verification to
the `matrix.org` and `vector.im` identity servers (or another identity
server that supports SMS sending).

The `account_threepid_delegates` dictionary defines whether the
homeserver should delegate an external server (typically an [identity
server](https://matrix.org/docs/spec/identity_service/r0.2.1)) to handle
sending confirmation messages via email and SMS.

So to delegate phone number verification, in `homeserver.yaml`, set
`account_threepid_delegates.msisdn` to the base URL of an identity
server. For example:

```yaml
account_threepid_delegates:
    msisdn: https://example.com     # Delegate sms sending to example.com
```

The `matrix.org` and `vector.im` identity servers will continue to
support delegated phone number verification via SMS until such time as
it is possible for admins to configure their servers to perform phone
number verification directly. More details will follow in a future
release.

## Rolling back to v1.3.1

If you encounter problems with v1.4.0, it should be possible to roll
back to v1.3.1, subject to the following:

-   The 'room statistics' engine was heavily reworked in this release
    (see [#5971](https://github.com/matrix-org/synapse/pull/5971)),
    including significant changes to the database schema, which are not
    easily reverted. This will cause the room statistics engine to stop
    updating when you downgrade.

    The room statistics are essentially unused in v1.3.1 (in future
    versions of Synapse, they will be used to populate the room
    directory), so there should be no loss of functionality. However,
    the statistics engine will write errors to the logs, which can be
    avoided by setting the following in `homeserver.yaml`:

    ```yaml
    stats:
      enabled: false
    ```

    Don't forget to re-enable it when you upgrade again, in preparation
    for its use in the room directory!

# Upgrading to v1.2.0

Some counter metrics have been renamed, with the old names deprecated.
See [the metrics
documentation](metrics-howto.md#renaming-of-metrics--deprecation-of-old-names-in-12)
for details.

# Upgrading to v1.1.0

Synapse v1.1.0 removes support for older Python and PostgreSQL versions,
as outlined in [our deprecation
notice](https://matrix.org/blog/2019/04/08/synapse-deprecating-postgres-9-4-and-python-2-x).

## Minimum Python Version

Synapse v1.1.0 has a minimum Python requirement of Python 3.5. Python
3.6 or Python 3.7 are recommended as they have improved internal string
handling, significantly reducing memory usage.

If you use current versions of the Matrix.org-distributed Debian
packages or Docker images, action is not required.

If you install Synapse in a Python virtual environment, please see
"Upgrading to v0.34.0" for notes on setting up a new virtualenv under
Python 3.

## Minimum PostgreSQL Version

If using PostgreSQL under Synapse, you will need to use PostgreSQL 9.5
or above. Please see the [PostgreSQL
documentation](https://www.postgresql.org/docs/11/upgrading.html) for
more details on upgrading your database.

# Upgrading to v1.0

## Validation of TLS certificates

Synapse v1.0 is the first release to enforce validation of TLS
certificates for the federation API. It is therefore essential that your
certificates are correctly configured.

Note, v1.0 installations will also no longer be able to federate with
servers that have not correctly configured their certificates.

In rare cases, it may be desirable to disable certificate checking: for
example, it might be essential to be able to federate with a given
legacy server in a closed federation. This can be done in one of two
ways:-

-   Configure the global switch `federation_verify_certificates` to
    `false`.
-   Configure a whitelist of server domains to trust via
    `federation_certificate_verification_whitelist`.

See the [sample configuration file](usage/configuration/homeserver_sample_config.md)
for more details on these settings.

## Email

When a user requests a password reset, Synapse will send an email to the
user to confirm the request.

Previous versions of Synapse delegated the job of sending this email to
an identity server. If the identity server was somehow malicious or
became compromised, it would be theoretically possible to hijack an
account through this means.

Therefore, by default, Synapse v1.0 will send the confirmation email
itself. If Synapse is not configured with an SMTP server, password reset
via email will be disabled.

To configure an SMTP server for Synapse, modify the configuration
section headed `email`, and be sure to have at least the `smtp_host`,
`smtp_port` and `notif_from` fields filled out. You may also need to set
`smtp_user`, `smtp_pass`, and `require_transport_security`.

If you are absolutely certain that you wish to continue using an
identity server for password resets, set
`trust_identity_server_for_password_resets` to `true`.

See the [sample configuration file](usage/configuration/homeserver_sample_config.md)
for more details on these settings.

## New email templates

Some new templates have been added to the default template directory for the purpose of
the homeserver sending its own password reset emails. If you have configured a
custom `template_dir` in your Synapse config, these files will need to be added.

`password_reset.html` and `password_reset.txt` are HTML and plain text
templates respectively that contain the contents of what will be emailed
to the user upon attempting to reset their password via email.
`password_reset_success.html` and `password_reset_failure.html` are HTML
files that the content of which (assuming no redirect URL is set) will
be shown to the user after they attempt to click the link in the email
sent to them.

# Upgrading to v0.99.0

Please be aware that, before Synapse v1.0 is released around March 2019,
you will need to replace any self-signed certificates with those
verified by a root CA. Information on how to do so can be found at the
ACME docs.

# Upgrading to v0.34.0

1.  This release is the first to fully support Python 3. Synapse will
    now run on Python versions 3.5, or 3.6 (as well as 2.7). We
    recommend switching to Python 3, as it has been shown to give
    performance improvements.

    For users who have installed Synapse into a virtualenv, we recommend
    doing this by creating a new virtualenv. For example:

    ```sh
    virtualenv -p python3 ~/synapse/env3
    source ~/synapse/env3/bin/activate
    pip install matrix-synapse
    ```

    You can then start synapse as normal, having activated the new
    virtualenv:

    ```sh
    cd ~/synapse
    source env3/bin/activate
    synctl start
    ```

    Users who have installed from distribution packages should see the
    relevant package documentation. See below for notes on Debian
    packages.

    -   When upgrading to Python 3, you **must** make sure that your log
        files are configured as UTF-8, by adding `encoding: utf8` to the
        `RotatingFileHandler` configuration (if you have one) in your
        `<server>.log.config` file. For example, if your `log.config`
        file contains:

        ```yaml
        handlers:
          file:
            class: logging.handlers.RotatingFileHandler
            formatter: precise
            filename: homeserver.log
            maxBytes: 104857600
            backupCount: 10
            filters: [context]
          console:
            class: logging.StreamHandler
            formatter: precise
            filters: [context]
        ```

        Then you should update this to be:

        ```yaml
        handlers:
          file:
            class: logging.handlers.RotatingFileHandler
            formatter: precise
            filename: homeserver.log
            maxBytes: 104857600
            backupCount: 10
            filters: [context]
            encoding: utf8
          console:
            class: logging.StreamHandler
            formatter: precise
            filters: [context]
        ```

        There is no need to revert this change if downgrading to
        Python 2.

    We are also making available Debian packages which will run Synapse
    on Python 3. You can switch to these packages with
    `apt-get install matrix-synapse-py3`, however, please read
    [debian/NEWS](https://github.com/matrix-org/synapse/blob/release-v0.34.0/debian/NEWS)
    before doing so. The existing `matrix-synapse` packages will
    continue to use Python 2 for the time being.

2.  This release removes the `riot.im` from the default list of trusted
    identity servers.

    If `riot.im` is in your homeserver's list of
    `trusted_third_party_id_servers`, you should remove it. It was added
    in case a hypothetical future identity server was put there. If you
    don't remove it, users may be unable to deactivate their accounts.

3.  This release no longer installs the (unmaintained) Matrix Console
    web client as part of the default installation. It is possible to
    re-enable it by installing it separately and setting the
    `web_client_location` config option, but please consider switching
    to another client.

# Upgrading to v0.33.7

This release removes the example email notification templates from
`res/templates` (they are now internal to the python package). This
should only affect you if you (a) deploy your Synapse instance from a
git checkout or a github snapshot URL, and (b) have email notifications
enabled.

If you have email notifications enabled, you should ensure that
`email.template_dir` is either configured to point at a directory where
you have installed customised templates, or leave it unset to use the
default templates.

# Upgrading to v0.27.3

This release expands the anonymous usage stats sent if the opt-in
`report_stats` configuration is set to `true`. We now capture RSS memory
and cpu use at a very coarse level. This requires administrators to
install the optional `psutil` python module.

We would appreciate it if you could assist by ensuring this module is
available and `report_stats` is enabled. This will let us see if
performance changes to synapse are having an impact to the general
community.

# Upgrading to v0.15.0

If you want to use the new URL previewing API
(`/_matrix/media/r0/preview_url`) then you have to explicitly enable it
in the config and update your dependencies dependencies. See README.rst
for details.

# Upgrading to v0.11.0

This release includes the option to send anonymous usage stats to
matrix.org, and requires that administrators explicitly opt in or out by
setting the `report_stats` option to either `true` or `false`.

We would really appreciate it if you could help our project out by
reporting anonymized usage statistics from your homeserver. Only very
basic aggregate data (e.g. number of users) will be reported, but it
helps us to track the growth of the Matrix community, and helps us to
make Matrix a success, as well as to convince other networks that they
should peer with us.

# Upgrading to v0.9.0

Application services have had a breaking API change in this version.

They can no longer register themselves with a home server using the AS
HTTP API. This decision was made because a compromised application
service with free reign to register any regex in effect grants full
read/write access to the home server if a regex of `.*` is used. An
attack where a compromised AS re-registers itself with `.*` was deemed
too big of a security risk to ignore, and so the ability to register
with the HS remotely has been removed.

It has been replaced by specifying a list of application service
registrations in `homeserver.yaml`:

```yaml
app_service_config_files: ["registration-01.yaml", "registration-02.yaml"]
```

Where `registration-01.yaml` looks like:

```yaml
url: <String>  # e.g. "https://my.application.service.com"
as_token: <String>
hs_token: <String>
sender_localpart: <String>  # This is a new field which denotes the user_id localpart when using the AS token
namespaces:
  users:
    - exclusive: <Boolean>
      regex: <String>  # e.g. "@prefix_.*"
  aliases:
    - exclusive: <Boolean>
      regex: <String>
  rooms:
    - exclusive: <Boolean>
      regex: <String>
```

# Upgrading to v0.8.0

Servers which use captchas will need to add their public key to:

    static/client/register/register_config.js

      window.matrixRegistrationConfig = {
          recaptcha_public_key: "YOUR_PUBLIC_KEY"
      };

This is required in order to support registration fallback (typically
used on mobile devices).

# Upgrading to v0.7.0

New dependencies are:

-   pydenticon
-   simplejson
-   syutil
-   matrix-angular-sdk

To pull in these dependencies in a virtual env, run:

    python synapse/python_dependencies.py | xargs -n 1 pip install

# Upgrading to v0.6.0

To pull in new dependencies, run:

    python setup.py develop --user

This update includes a change to the database schema. To upgrade you
first need to upgrade the database by running:

    python scripts/upgrade_db_to_v0.6.0.py <db> <server_name> <signing_key>

Where `<db>` is the location of the database,
`<server_name>` is the server name as specified in the
synapse configuration, and `<signing_key>` is the location
of the signing key as specified in the synapse configuration.

This may take some time to complete. Failures of signatures and content
hashes can safely be ignored.

# Upgrading to v0.5.1

Depending on precisely when you installed v0.5.0 you may have ended up
with a stale release of the reference matrix webclient installed as a
python module. To uninstall it and ensure you are depending on the
latest module, please run:

    $ pip uninstall syweb

# Upgrading to v0.5.0

The webclient has been split out into a separate repository/package in
this release. Before you restart your homeserver you will need to pull
in the webclient package by running:

    python setup.py develop --user

This release completely changes the database schema and so requires
upgrading it before starting the new version of the homeserver.

The script "database-prepare-for-0.5.0.sh" should be used to upgrade
the database. This will save all user information, such as logins and
profiles, but will otherwise purge the database. This includes messages,
which rooms the home server was a member of and room alias mappings.

If you would like to keep your history, please take a copy of your
database file and ask for help in #matrix:matrix.org. The upgrade
process is, unfortunately, non trivial and requires human intervention
to resolve any resulting conflicts during the upgrade process.

Before running the command the homeserver should be first completely
shutdown. To run it, simply specify the location of the database, e.g.:

> ./scripts/database-prepare-for-0.5.0.sh "homeserver.db"

Once this has successfully completed it will be safe to restart the
homeserver. You may notice that the homeserver takes a few seconds
longer to restart than usual as it reinitializes the database.

On startup of the new version, users can either rejoin remote rooms
using room aliases or by being reinvited. Alternatively, if any other
homeserver sends a message to a room that the homeserver was previously
in the local HS will automatically rejoin the room.

# Upgrading to v0.4.0

This release needs an updated syutil version. Run:

    python setup.py develop

You will also need to upgrade your configuration as the signing key
format has changed. Run:

    python -m synapse.app.homeserver --config-path <CONFIG> --generate-config

# Upgrading to v0.3.0

This registration API now closely matches the login API. This introduces
a bit more backwards and forwards between the HS and the client, but
this improves the overall flexibility of the API. You can now GET on
/register to retrieve a list of valid registration flows. Upon choosing
one, they are submitted in the same way as login, e.g:

    {
      type: m.login.password,
      user: foo,
      password: bar
    }

The default HS supports 2 flows, with and without Identity Server email
authentication. Enabling captcha on the HS will add in an extra step to
all flows: `m.login.recaptcha` which must be completed before you can
transition to the next stage. There is a new login type:
`m.login.email.identity` which contains the `threepidCreds` key which
were previously sent in the original register request. For more
information on this, see the specification.

## Web Client

The VoIP specification has changed between v0.2.0 and v0.3.0. Users
should refresh any browser tabs to get the latest web client code. Users
on v0.2.0 of the web client will not be able to call those on v0.3.0 and
vice versa.

# Upgrading to v0.2.0

The home server now requires setting up of SSL config before it can run.
To automatically generate default config use:

    $ python synapse/app/homeserver.py \
        --server-name machine.my.domain.name \
        --bind-port 8448 \
        --config-path homeserver.config \
        --generate-config

This config can be edited if desired, for example to specify a different
SSL certificate to use. Once done you can run the home server using:

    $ python synapse/app/homeserver.py --config-path homeserver.config

See the README.rst for more information.

Also note that some config options have been renamed, including:

-   "host" to "server-name"
-   "database" to "database-path"
-   "port" to "bind-port" and "unsecure-port"

# Upgrading to v0.0.1

This release completely changes the database schema and so requires
upgrading it before starting the new version of the homeserver.

The script "database-prepare-for-0.0.1.sh" should be used to upgrade
the database. This will save all user information, such as logins and
profiles, but will otherwise purge the database. This includes messages,
which rooms the home server was a member of and room alias mappings.

Before running the command the homeserver should be first completely
shutdown. To run it, simply specify the location of the database, e.g.:

> ./scripts/database-prepare-for-0.0.1.sh "homeserver.db"

Once this has successfully completed it will be safe to restart the
homeserver. You may notice that the homeserver takes a few seconds
longer to restart than usual as it reinitializes the database.

On startup of the new version, users can either rejoin remote rooms
using room aliases or by being reinvited. Alternatively, if any other
homeserver sends a message to a room that the homeserver was previously
in the local HS will automatically rejoin the room.