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virt-aa-helper: apparmor wildcards to forbidden chars

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Some globbing chars in the domain name could be used to break out of
apparmor rules, so lets forbid these when in virt-aa-helper.

Also adding a test to ensure all those cases were detected as bad char.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
This commit is contained in:
Christian Ehrhardt 2017-10-26 15:22:10 +02:00 committed by Michal Privoznik
parent a50b45a297
commit a150b86c4c
2 changed files with 21 additions and 1 deletions
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2
src/security/virt-aa-helper.c
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@ -449,7 +449,7 @@ valid_name(const char *name)
{ {
/* just try to filter out any dangerous characters in the name that can be /* just try to filter out any dangerous characters in the name that can be
* used to subvert the profile */ * used to subvert the profile */
const char *bad = "/[]*"; const char *bad = "/[]{}?^,\"*";
if (strlen(name) == 0) if (strlen(name) == 0)
return -1; return -1;

20
tests/virt-aa-helper-test
View File

@ -211,6 +211,26 @@ testme "1" "-c with no os.type" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,hvm</type>,hvm_invalid</type>,g" "$template_xml" > "$test_xml" sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,hvm</type>,hvm_invalid</type>,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid hvm" "-c -u $valid_uuid" "$test_xml" testme "1" "-c with invalid hvm" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-/,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char /" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-[,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char [" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-],g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char ]" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-{,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char {" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-},g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char }" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-?,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char ?" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-^,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char ^" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-\,,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char ," "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-\",g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char \"" "-c -u $valid_uuid" "$test_xml"
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,virt-aa-helper-test,virt-aa-helper-test-*,g" "$template_xml" > "$test_xml"
testme "1" "-c with invalid domain name char *" "-c -u $valid_uuid" "$test_xml"
echo "Expected pass:" >$output echo "Expected pass:" >$output
sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" "$template_xml" > "$test_xml" sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" "$template_xml" > "$test_xml"