add a check for kcm-socket file when configuring kerberos#1771
add a check for kcm-socket file when configuring kerberos#1771omegaji wants to merge 1 commit intocontainers:mainfrom
Conversation
Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request enhances the Kerberos configuration process by adding a robust check for the KCM socket's presence and validity. This ensures that Kerberos setup only proceeds when the necessary communication channel for credential management is operational, thereby preventing potential configuration failures and improving the overall reliability of Kerberos integration within the application. Highlights
🧠 New Feature in Public Preview: You can now enable Memory to help Gemini Code Assist learn from your team's feedback. This makes future code reviews more consistent and personalized to your project's style. Click here to enable Memory in your admin console. Changelog
Activity
Using Gemini Code AssistThe full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips. Invoking Gemini You can request assistance from Gemini at any point by creating a comment using either
Customization To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a Limitations & Feedback Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here. You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension. Footnotes
|
When configuring kerberos, it was assumed the sssd-kcm service and corresponding socket were active. Which is not necessarily true, as it can be disabled and not exist. containers#1771 Signed-off-by: om <omhpurohit@gmail.com>
![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
There was a problem hiding this comment.
Code Review
This pull request adds a check to see if the KCM socket is enabled before attempting to configure Kerberos. This is a sensible improvement to prevent configuration errors when KCM is not being used. The implementation correctly checks for the socket file, and also attempts to parse /etc/krb5.conf for a custom socket path. However, the configuration file parsing logic is a bit too simplistic and doesn't handle comments, which could lead to incorrect behavior. I've provided a suggestion to make the parsing more robust.
| for scanner.Scan() { | ||
| text := strings.TrimSpace(scanner.Text()) | ||
| if strings.HasPrefix(text, "[") { | ||
| insideLibdefaultsSection = text == "[libdefaults]" | ||
| continue | ||
| } | ||
|
|
||
| if insideLibdefaultsSection { | ||
| parts := strings.SplitN(text, "=", 2) | ||
| if len(parts) == 2 && strings.TrimSpace(parts[0]) == "kcm_socket" { | ||
| kcmSocketPath = strings.TrimSpace(parts[1]) | ||
| } | ||
| } | ||
| } |
There was a problem hiding this comment.
The current parsing logic for /etc/krb5.conf is a bit too simple and doesn't handle comments. According to the krb5.conf man page, lines can contain comments starting with # or ;. The current implementation can fail in a few ways:
- A section header with a comment (e.g.,
[libdefaults] # comment) will not be recognized correctly. - A key-value pair with an inline comment (e.g.,
kcm_socket = /path/to/socket # comment) will result in the comment being part of the path.
I suggest a more robust parsing loop that handles comments and empty lines correctly, and also properly identifies section headers.
for scanner.Scan() {
line := scanner.Text()
// Ignore comments, which can start with '#' or ';'.
if i := strings.IndexAny(line, "#;"); i != -1 {
line = line[:i]
}
text := strings.TrimSpace(line)
if text == "" {
continue
}
// Check for section headers like '[libdefaults]'.
if strings.HasPrefix(text, "[") && strings.HasSuffix(text, "]") {
sectionName := strings.TrimSpace(text[1 : len(text)-1])
insideLibdefaultsSection = sectionName == "libdefaults"
continue
}
if insideLibdefaultsSection {
parts := strings.SplitN(text, "=", 2)
if len(parts) == 2 && strings.TrimSpace(parts[0]) == "kcm_socket" {
kcmSocketPath = strings.TrimSpace(parts[1])
}
}
}
|
Build failed. ❌ unit-test FAILURE in 2m 10s |
1 participant
An attempt to fix: #1734
When configuring kerberos, it should be checked if the corresponding domain socket used for communication with KCM exists or not.
From the man page, they do state that the default path of the socket is
/run/.heim_org.h5l.kcm-socket. But they also state that it is configurable through the conf file, by adding akcm_socketfield.So hopefully checking at that path to see if the socket exists or not should be enough to fix this issue.
As for testing it, I do the same as the reproduction steps mentioned in the issue, instead of doing
klistI dokinitwhich give the error:kinit: Configuration file does not specify default realm when parsing name <user>. But I think the error is just that I haven't configured the default_realm in my conf file.And also the default cache isn't KCM in this case as well, it becomes the kernel keyring cache
default_ccache_name = KEYRING:persistent:%{uid}