Skip to main content

TFS Build Agent - SSL certificate problem: unable to get local issuer certificate

After upgrading to a new TFS server and going full HTTPS, our git based builds started to fail with the following error message:

2018-06-12T21:28:45.8463514Z ##[command]git init "D:\Builds\dev-agent-1\_work\5\s"

2018-06-12T21:28:45.9154418Z Initialized empty Git repository in D:/Builds/dev-agent-1/_work/5/s/.git/

2018-06-12T21:28:45.9219662Z ##[command]git remote add origin https://tfs/DefaultCollection/_git/Sample

2018-06-12T21:28:45.9821910Z ##[command]git config gc.auto 0

2018-06-12T21:28:46.0407163Z ##[command]git config --get-all http.https://tfs/DefaultCollection/_git/Sample.extraheader

2018-06-12T21:28:46.0994413Z ##[command]git config --get-all http.proxy

2018-06-12T21:28:46.1508406Z ##[command]git -c http.extraheader="AUTHORIZATION: bearer ********" fetch --tags --prune --progress --no-recurse-submodules origin

2018-06-12T21:28:46.3636860Z fatal: unable to access 'https://tfs/DefaultCollection/_git/Sample/': SSL certificate problem: unable to get local issuer certificate

2018-06-12T21:28:46.3988694Z ##[error]Git fetch failed with exit code: 128

2018-06-12T21:28:46.4040002Z ##[section]Finishing: Get Sources

The SSL certificate we are using is based on a corporate root certificate. This root certificate is stored in the certificate store on all the servers .Any application written to use the Windows crypto APIs will have access to that root certificate, and will consider your TFS deployment to be trusted.

Unfortunately, Git for Windows (git.exe) uses OpenSSL for its crypto stack, and the Git for Windows distribution includes a set of trusted root certificates in a simple text file. As our root certificate is not in this set, we’ll get the error above.

An easy workaround we used at first was to add the following configuration setting on the global git config available at c:\programdata\git

[http] sslVerify=false

As this globally disables TLS(/SSL) certificate verification, it is not a solution I would recommend. This defeats the purpose of introducing SSL in the first place.

We’ll have to find a better solution, but we’ll leave that for another blog post…

Labels:

Popular posts from this blog

Podman– Command execution failed with exit code 125

After updating WSL on one of the developer machines, Podman failed to work. When we took a look through Podman Desktop, we noticed that Podman had stopped running and returned the following error message: Error: Command execution failed with exit code 125 Here are the steps we tried to fix the issue: We started by running podman info to get some extra details on what could be wrong: >podman info OS: windows/amd64 provider: wsl version: 5.3.1 Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM Error: unable to connect to Podman socket: failed to connect: dial tcp 127.0.0.1:2655: connectex: No connection could be made because the target machine actively refused it. That makes sense as the podman VM was not running. Let’s check the VM: >podman machine list NAME         ...
Read more

Cache stampede: when our cache turned against us

While investigating some performance issues, we ran into an ASP.NET Core API that cached a fairly expensive aggregation query for 60 seconds. Under normal load, that was fine: one request rebuilds the cache, everyone else reads from it. Under peak load, dozens of requests would arrive in that same expiry window, all see a cache miss, and all fire the same expensive query in parallel. The database didn't like that. That was the moment when our caching layer stopped helping and started hurting. A burst of requests comes in at the same time, all miss the cache, and all go hammer the database or the downstream API at once. That's a cache stampede . The cache was supposed to protect our backend, and for a few hundred milliseconds it did the opposite. Why this happens IMemoryCache.GetOrCreate (and its async sibling) looks like it protects you, but it doesn't add any locking on its own. Look at the naive version: public async Task<Report> GetReportAsync(string key) ...
Read more

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more