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Edit on GitHubWhen releasing the Mattermost Desktop application for Windows and macOS, we have to sign the executable with a certificate that allows the end user’s computer to verify our identity.
The signing procedure varies depending on the platform that the release is destined for and the platform that the signing operation is performed on. This page attempts to document the procedure and some common pitfalls that developers may encounter along the way.
Code Signing Windows Releases
Releases destined for Windows can be code signed on Windows, macOS, or Linux.
Prerequisites
In order to code sign releases on behalf of Mattermost Inc., you’ll need a
.pfx
(Personal Information Exchange) file that contains Mattermost’s public key (SSL certificate file), and the associated private key file. The file is protected by a password that you’ll need in order to use it.Mattermost Mobile App On Premise Server
This file has been shared in LastPass. Talk to Joram Wilander, Corey Hulen, or Jonathan Fritz to get access to it.
Regenerating the .pfx File
Signing certificates occasionally expire. When renewed, the registrar will provide you with a
.spc
(Software Publishing Certificate) and a .pem
(Public Key) file. These must be combined with a corresponding .key
(Private Key) file to create the .pfx
(Personal Information Exchange) file that is used to sign builds.First, verify that the
.pem
and .key
files match:If the md5 hash of the modulus of each file matches, they are a valid pair.
Next, combine the two files into a single
.pfx
file: Parallels desktop 12 for mac oem.You will be prompted for a password. This password will lock the
.pfx
file, and must be provided every time somebody tries to use it. The resulting file can be used in the next step to sign builds.Code Signing on Windows
On Windows hosts, Microsoft’s
SignTool
utility can be used to code sign releases.To install
SignTool
you’ll need the Microsoft Windows Software Development Kit (SDK). If you have a copy of Visual Studio installed, you might already have it included with the commandlines packaged with Visual Studio.Mac windows media player free download. After successfully building and packaging the Mattermost Desktop application for Windows, you can run the signing command from the root of the repository:
Where
- **PATH_TO_THE_PFX_FILE** is the absolute path to the `.pfx` file that was obtained in the Prerequisites section above
- **PFX_FILE_PASSWORD** is the password that protects the `.pfx` file from being misused
- **PATH_TO_UNSIGNED_EXE** is the absolute path of the unsigned executable that you want to sign. It is typically in the `release/win` or `release/win-ia32` subdirectory of the repository
Code Signing on macOS and Linux
On macOS and Linux hosts, the open source
osssigntool
can be used to code sign releases. It can be installed via Homebrew on macOS:or via Apt on Ubuntu:
After successfully building and packaging the Mattermost Desktop application for Windows, you can run the signing command from the root of the repository:
Where
- **PATH_TO_THE_PFX_FILE** is the absolute path to the `.pfx` file that was obtained in the Prerequisites section above
- **PFX_FILE_PASSWORD** is the password that protects the `.pfx` file from being misused
- **PATH_TO_UNSIGNED_EXE** is the absolute path of the unsigned executable that you want to sign. It is typically in the `release/win` or `release/win-ia32` subdirectory of the repository
- **PATH_TO_WRITE_SIGNED_EXE_TO** is the absolute path to write the signed executable to
Verifying the Signature:
Once you have successfully signed the release, you can use the
verify
flag of the osslsigncode
utility to ensure that the signature was applied correctly.NOTE: This verification step will pass even if the certificate that was used to sign the build is expired. Always copy the signed executable to a Windows box, right-click on it, select Properties > Digital Signatures > Details > View Certificates > General and ensure that no validation errors are shown.
Code Signing macOS Releases
Releases destined for macOS can only be code signed on a macOS host. It is not possible to sign macOS releases on a Windows or Linux host.
Prerequisites
In order to code sign releases on behalf of Mattermost Inc., you’ll need to be a member of the Apple Developer program and a part of the Mattermost, Inc. team. You can check your team membership in Xcode by selecting Preferences from the Xcode menu, and opening the Accounts tab in the dialog box that appears.If you aren’t a member of the Mattermost, Inc. team, talk to Joram Wilander, Corey Hulen, or Jonathan Fritz.
Once you are a member of the team, click the Download Manual Profiles Can i download spotify to my phone. button at the bottom of the Accounts dialog. Next, highlight Mattermost, Inc. in the team list, and click the Manage Certificates… button. https://everapartment706.weebly.com/mac-app-store-ireland.html.
Dod Mattermost
Whatsapp free call download for windows phone. In the dialog that appears, ensure that you have a Developer ID Application certificate under the macOS Distribution Certificates heading:
If you do not see the macOS Distribution Certificates heading or the Developer ID Application certificate is missing, you can download the certificate from The Apple Developers Portal. Sign in with your Apple ID and select Certificates, IDs & Profiles from the left hand sidebar:
How to block update alerts for apps on mac. From the drop down box in the top left hand corner of the Certificates, Identifiers & Profiles page that appears, select macOS. Next, under the Certificates heading in the left hand sidebar, select All. The Mattermost, Inc. Developer ID Application certificate should appear in the centre panel of the screen. Click on it to expand it and then click on the Download button that appears.
Once downloaded, you can double-click on the certificate file to import it into your local keychain.
Back in XCode, the entry in the Status column of the Manage Certificates… dialog for this certificate will be
Missing Private Key
:The private key is available in a
.p12
file that has been shared in LastPass. Talk to Joram Wilander, Corey Hulen, or Jonathan Fritz to get access to it. Once downloaded, double-click on the file to import it into your macOS keychain. It should appear in the Keys category of your login keychain:Back in Xcode, under Xcode > Preferences > Accounts > Manage Certificates…, the Status column entry for the Developer ID Application certificate should now be empty:
Finally, you’ll need to install the
electron-osx-sign
utility via NPM:Signing the Release
Note that once the code signing certificate and private key have been imported as described in the Prerequisites section above, the application will automatically be code signed during building and packaging. To confirm that this step has been completed, skip down to the Verifying the Signature section below.If the application was built and packaged by somebody else, and you need to sign to the
.app
that they produced, you can run the signing command from the root of the repository:Known Issues
Code signing is a bit of a black art. Some issues that have been observed in the past are likely to affect you in the future. If you encounter any troubles while code signing macOS releases, please document them here to help the rest of the team.
No Identity Found for Signing
If the
electron-osx-sign
command failed with an error message like this one:It is likely that you have not successfully imported the Mattermost Developer ID Application certificate and associated private key. See the Prerequisites section above.
Code Object is not Signed at all
If the
electron-osx-sign
command failed with an error message like this one:You have resource files in the wrong place in your release folder. According to Apple’s Developer Docs, all resource files (i.e. anything that isn’t code) must be in the
Content/Resources
folder within the .app
package. In this case, the LICENSE.txt
file is located in the top-level Contents
directory, causing the code signing operation to fail. This can be fixed by moving any non-code resource files into the Content/Resources
directory.Mattermost Team
Signing Doesn’t Work via SSH
If you’re attempting to perform code signing on a remote box via SSH (for instance, if the build is being run on a macOS slave controlled by Jenkins), you will need to unlock the keychain that contains the signing certificate and private key before either can be used.
To unlock the keychain, run this command before attempting to sign the code:
To avoid committing the password for the slave machine to GitHub, you can save the password to a file that resides on the slave machine, and read it from that file during signing:
Verifying the Signature
Once you have successfully signed the release, you can use the
codesign
utility that ships with macOS to verify that the signature was applied correctly.Download Matter Most App Mac Download
You can also use the
spctl
utility to ensure that end users will be allowed to install the application on their machines: