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Add filepath glob support to --security-opt unmask

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Want to allow users to specify --security-opt unmask=/proc/*.
This allows us to run podman within podman more securely, then
specifing umask=all, also gives the user more flexibilty.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
This commit is contained in:
Daniel J Walsh
2021-05-01 05:50:31 -04:00
parent 7f2c27d43f
commit 4fd1965ab4
6 changed files with 81 additions and 30 deletions
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3
docs/source/markdown/podman-create.1.md
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@ -882,8 +882,7 @@ Note: Labeling can be disabled for all containers by setting label=false in the
- `proc-opts=OPTIONS` : Comma-separated list of options to use for the /proc mount. More details for the
possible mount options are specified in the **proc(5)** man page.
- `unmask=ALL or /path/1:/path/2` : Paths to unmask separated by a colon. If set to **ALL**, it will
unmask all the paths that are masked or made read only by default.
- **unmask**=_ALL_ or _/path/1:/path/2_, or shell expanded paths (/proc/*): Paths to unmask separated by a colon. If set to **ALL**, it will unmask all the paths that are masked or made read only by default.
The default masked paths are **/proc/acpi, /proc/kcore, /proc/keys, /proc/latency_stats, /proc/sched_debug, /proc/scsi, /proc/timer_list, /proc/timer_stats, /sys/firmware, and /sys/fs/selinux.** The default paths that are read only are **/proc/asound, /proc/bus, /proc/fs, /proc/irq, /proc/sys, /proc/sysrq-trigger, /sys/fs/cgroup**.
Note: Labeling can be disabled for all containers by setting label=false in the **containers.conf** (`/etc/containers/containers.conf` or `$HOME/.config/containers/containers.conf`) file.

10
docs/source/markdown/podman-run.1.md
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@ -934,8 +934,7 @@ Note: Labeling can be disabled for all containers by setting label=false in the
- **proc-opts**=_OPTIONS_ : Comma-separated list of options to use for the /proc mount. More details
for the possible mount options are specified in the **proc(5)** man page.
- **unmask**=_ALL_ or _/path/1:/path/2_: Paths to unmask separated by a colon. If set to **ALL**, it will
unmask all the paths that are masked or made read only by default.
- **unmask**=_ALL_ or _/path/1:/path/2_, or shell expanded paths (/proc/*): Paths to unmask separated by a colon. If set to **ALL**, it will unmask all the paths that are masked or made read only by default.
The default masked paths are **/proc/acpi, /proc/kcore, /proc/keys, /proc/latency_stats, /proc/sched_debug, /proc/scsi, /proc/timer_list, /proc/timer_stats, /sys/firmware, and /sys/fs/selinux.**. The default paths that are read only are **/proc/asound**, **/proc/bus**, **/proc/fs**, **/proc/irq**, **/proc/sys**, **/proc/sysrq-trigger**, **/sys/fs/cgroup**.
Note: Labeling can be disabled for all containers by setting **label=false** in the **containers.conf**(5) file.
@ -1644,6 +1643,13 @@ the **mask** option.
$ podman run --security-opt unmask=ALL fedora bash
```
To unmask all the paths that start with /proc, set the **unmask** option to
**/proc/***.
```
$ podman run --security-opt unmask=/proc/* fedora bash
```
```
$ podman run --security-opt unmask=/foo/bar:/sys/firmware fedora bash
```