1 Commits

Author SHA1 Message Date
2422df5db7 Add (not currently working) settings to generate a SQL db 2021-03-27 00:02:19 -05:00
8 changed files with 45 additions and 96 deletions

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@ -1,24 +0,0 @@
---
kind: pipeline
type: docker
name: Deploy to bbaovanc.com
steps:
- name: Build site
image: mapitman/docker-hugo
commands:
- hugo version
- hugo --minify
- name: Upload files
image: appleboy/drone-scp
aettings:
host: bbaovanc.com
port: 2222
username: droneci
key:
from_secret: SSH_KEY
target: /var/www/bbaovanc/blog
rm: true
source:
- public/*

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@ -4,6 +4,17 @@ theme = "terminal"
paginate = 5
enableGitInfo = true
[mediaTypes]
[mediaTypes."text/sql"]
suffixes = ["sql"]
[outputFormats]
[outputFormats.SQL]
mediaType = "text/sql"
[outputs]
home = ["sql", "html"]
# [permalinks]
# posts = "/:year/:month/:title/"

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@ -1,68 +0,0 @@
+++
title = "Allow Non Root Processes to Bind to Privileged Ports"
date = "2021-03-28T20:03:16-05:00"
author = "bbaovanc"
tags = ["guide", "linux", "systemd"]
keywords = ["linux", "privileged", "ports", "tutorial", "guide", "gitea",
"systemd"]
description = """
In Linux, processes cannot bind to privileged ports (<=1024) unless they are
running as root. Here's how to allow any process to bind to privileged ports.
"""
showFullContent = false
toc = true
+++
## Introduction
In Linux, processes cannot bind to privileged ports (<=1024) unless they are
running as root. I learned about this when I was trying to add SSH cloning to my
[Gitea](https://gitea.io) instance. This can be bypassed by giving
`CAP_NET_BIND_SERVICE` capabilities to either the systemd service, or the
executable itself.
## Giving `CAP_NET_BIND_SERVICE` capabilities
### Using systemd (preferred)
The best way is to tell systemd to give `CAP_NET_BIND_SERVICE`
capabilities to the service. In fact, the Gitea systemd service has two
lines[^1] that are commented out:
```systemd
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_NET_BIND_SERVICE
```
Uncommenting these two lines was all I had to do for Gitea.
### Using `setcap`
You can add `CAP_NET_BIND_SERVICE` to the executable directly using `setcap`,
allowing it to bind to any port. Run the following command[^2]:
```bash
setcap 'cap_net_bind_service=+ep' /path/to/program
```
Note that this means that anyone with permission to run this program will be
able to run it and bind to any privileged ports.
Other caveats[^2]:
> 1. You will need at least a 2.6.24 kernel
> 2. This won't work if your file is a script. (ie, uses a #! line to launch an
> interpreter). In this case, as far I as understand, you'd have to apply the
> capability to the interpreter executable itself, which of course is a
> security nightmare, since any program using that interpreter will have the
> capability. I wasn't able to find any clean, easy way to work around this
> problem.
> 3. Linux will disable LD\_LIBRARY\_PATH on any program that has elevated
> privileges like setcap or suid. So if your program uses its own .../lib/,
> you might have to look into another option like port forwarding.
[^1]: https://github.com/go-gitea/gitea/blob/3416e2a82586fca4cd452b93237b979300f55d62/contrib/systemd/gitea.service#L69
and https://stackoverflow.com/a/47065825
[^2]: https://stackoverflow.com/a/414258

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@ -3,7 +3,7 @@ title = "Checkra1n GUI on Other Distros"
date = "2021-03-25T21:19:51-05:00"
author = "bbaovanc"
cover = "/blog/media/checkra1n-gui-on-arch-linux.png"
tags = ["guide", "linux", "archlinux", "jailbreak", "checkra1n"]
tags = ["linux", "archlinux", "jailbreak", "checkra1n"]
keywords = ["checkra1n", "gui", "linux", "arch linux"]
description = """

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@ -3,7 +3,7 @@ title = "Put (edited) in the middle of a message in Discord"
date = "2021-03-25T18:48:34-05:00"
author = "bbaovanc"
cover = "media/discord-tricks/edited-in-middle-of-message.png"
tags = ["tutorial", "discord", "discord-tricks"]
tags = ["discord", "discord-tricks"]
keywords = ["discord", "edited"]
description = """

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@ -2,7 +2,7 @@
title = "Text Substitution in Discord using `sed`"
date = "2021-03-25T18:48:15-05:00"
author = "bbaovanc"
tags = ["tutorial", "discord", "discord-tricks"]
tags = ["discord", "discord-tricks"]
keywords = ["discord", "sed", "text", "replacement"]
description = """
@ -12,7 +12,7 @@ Discord has (very primitive) support for text replacement using `sed` syntax.
showFullContent = false
+++
## Tutorial
## How-to
[Example Video](/blog/media/discord-tricks/sed-text-replacement.mov)

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@ -0,0 +1,17 @@
DROP TABLE IF EXISTS db.blog;
CREATE TABLE db.blog (
id INT NOT NULL AUTO_INCREMENT,
published DATE NOT NULL,
title TEXT NOT NULL,
body TEXT NOT NULL,
url varchar(2048) NOT NULL,
CONSTRAINT id_PK PRIMARY KEY (id)
)
ENGINE=InnoDB
DEFAULT CHARSET=utf8mb4
COLLATE=utf8mb4_general_ci;
CREATE FULLTEXT INDEX blog_body_IDX ON db.blog (body);
{{ block "main" .}}
{{ end }}

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@ -0,0 +1,13 @@
{{ define "main" }}
{{ range (where .Pages "Section" "ne" "gist") }}
{{ range .Pages }}
INSERT INTO db.blog (published, title, body, url)
VALUES(
'{{ .Date.Format "2006-01-02" }}',
'{{ plainify .Title }}',
'{{ (plainify .Content) }}',
'{{ .Permalink }}'
);
{{ end }}
{{ end }}
{{ end }}