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Chroot: change root to explicit prefix and label sub-dirs

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Change the root of a session request into an explicit path and apply the
label-to-path conversion using the "path_prefix" policy attribute. This
is in addition to only applying a root change with a "path" attribute.

Ref #3031
Fix #3056
This commit is contained in:
Emery Hemingway 2018-11-23 14:40:38 +01:00 committed by Christian Helmuth
parent 74f2954013
commit 447329eaee
2 changed files with 11 additions and 4 deletions
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6
repos/os/src/server/chroot/README
View File

@ -6,8 +6,10 @@ hierarchy of directories.
Sessions matching policies with _path_ attributes will be "chrooted" to the
configured policy path, sessions not matching policies with _path_ attributes
will be chrooted into paths formed from each session label element. Sessions
requests are downgraded to read-only requests unless matched by polices
with an affirmative _writeable_ attribute. Sessions not matching any
matching polices with a _path_prefix_ attribute are both rooted at the
attribute path and in sub-directories formed by the session label.
Sessions requests are downgraded to read-only requests unless matched by
polices with an affirmative _writeable_ attribute. Sessions not matching any
policy are rejected.
Please note that this server is only effective for File_system servers that

9
repos/os/src/server/chroot/component.cc
View File

@ -112,8 +112,13 @@ struct Chroot::Main
Session_label const label = label_from_args(args.string());
Session_policy const policy(label, config_rom.xml());
/* Use a chroot path from policy */
if (policy.has_attribute("path")) {
if (policy.has_attribute("path_prefix")) {
/* Use a chroot path from policy and label sub-directories */
policy.attribute("path_prefix").value(tmp, sizeof(tmp));
root_path.import(tmp);
root_path.append(path_from_label<Path>(label.string()).string());
} else if (policy.has_attribute("path")) {
/* Use a chroot path from policy */
policy.attribute("path").value(tmp, sizeof(tmp));
root_path.import(tmp);
} else {