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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package synthesis | ||
|
|
||
| import ( | ||
| "strings" | ||
|
|
||
| "github.com/np-guard/vmware-analyzer/pkg/model/dfw" | ||
| "github.com/np-guard/vmware-analyzer/pkg/symbolicexpr" | ||
| ) | ||
|
|
||
| ///////////////////////////////////////////////////////////////////////////////////// | ||
| // convert symbolic rules to allow only functionality | ||
| ///////////////////////////////////////////////////////////////////////////////////// | ||
|
|
||
| func computeAllowOnlyRulesForPolicy(categoriesSpecs []*dfw.CategorySpec, | ||
| categoryToPolicy map[dfw.DfwCategory]*symbolicPolicy) symbolicPolicy { | ||
| allowOnlyPolicy := symbolicPolicy{} | ||
| globalInboundDenies, globalOutboundDenies := symbolicexpr.SymbolicPaths{}, symbolicexpr.SymbolicPaths{} | ||
| // we go over categoriesSpecs to make sure we follow the correct order of categories | ||
| for _, category := range categoriesSpecs { | ||
| thisCategoryPolicy := categoryToPolicy[category.Category] | ||
| if thisCategoryPolicy == nil { | ||
| continue | ||
| } | ||
| inboundAllow, outboundAllow := computeAllowOnlyRulesForCategory(thisCategoryPolicy, | ||
| &globalInboundDenies, &globalOutboundDenies) | ||
| allowOnlyPolicy.inbound = append(allowOnlyPolicy.inbound, inboundAllow...) | ||
| allowOnlyPolicy.outbound = append(allowOnlyPolicy.outbound, outboundAllow...) | ||
| } | ||
| return allowOnlyPolicy | ||
| } | ||
|
|
||
| // gets here only if policy is not nil | ||
| func computeAllowOnlyRulesForCategory(originalPolicy *symbolicPolicy, globalInboundDenies, | ||
| globalOutboundDenies *symbolicexpr.SymbolicPaths) (inboundAllowOnly, outboundAllowOnly []*symbolicRule) { | ||
| inboundAllowOnly = computeAllowOnlyInboundOrOutbound(originalPolicy.inbound, globalInboundDenies) | ||
| outboundAllowOnly = computeAllowOnlyInboundOrOutbound(originalPolicy.outbound, globalOutboundDenies) | ||
| return | ||
| } | ||
|
|
||
| func computeAllowOnlyInboundOrOutbound(originalRules []*symbolicRule, globalDenies *symbolicexpr.SymbolicPaths) []*symbolicRule { | ||
| if originalRules == nil { | ||
| return nil | ||
| } | ||
| newAllows, newDenies := computeAllowOnlyForCategory(&originalRules, globalDenies) | ||
| *globalDenies = append(*globalDenies, *newDenies...) | ||
| return newAllows | ||
| } | ||
|
|
||
| // computes allow only rules, using the following algorithm: | ||
| // For each category, in order: | ||
| // Initialization: | ||
| // | ||
| // category_passes = empty set | ||
| // | ||
| // For each rule, in order | ||
| // | ||
| // case pass: | ||
| // category_passes = category_passes or rule | ||
| // case deny: | ||
| // new_denies = merge(category_passes, deny_rule) | ||
| // global_denies = global_denies union new_denies | ||
| // case allow: | ||
| // new_allow = merge(global_denies or category_passes, allow_rule) | ||
| // global_allows = global_allows or new_allows | ||
| // Output: global_allows | ||
| func computeAllowOnlyForCategory(inboundOrOutbound *[]*symbolicRule, | ||
| globalDenies *symbolicexpr.SymbolicPaths) (allowRule []*symbolicRule, denyPaths *symbolicexpr.SymbolicPaths) { | ||
| allowOnlyRules := []*symbolicRule{} | ||
| categoryPasses := symbolicexpr.SymbolicPaths{} | ||
| newGlobalDenies := symbolicexpr.SymbolicPaths{} | ||
| copy(newGlobalDenies, *globalDenies) | ||
| for _, rule := range *inboundOrOutbound { | ||
| switch rule.origRule.Action { | ||
| case dfw.ActionJumpToApp: | ||
| categoryPasses = append(categoryPasses, *rule.origSymbolicPaths...) | ||
| case dfw.ActionDeny: | ||
| newSymbolicPaths := symbolicexpr.ComputeAllowGivenDenies(rule.origSymbolicPaths, &categoryPasses) | ||
| newGlobalDenies = append(newGlobalDenies, *newSymbolicPaths...) | ||
| case dfw.ActionAllow: | ||
| symbolicDeniesAndPasses := symbolicexpr.SymbolicPaths{} | ||
| symbolicDeniesAndPasses = append(symbolicDeniesAndPasses, newGlobalDenies...) | ||
| symbolicDeniesAndPasses = append(symbolicDeniesAndPasses, categoryPasses...) | ||
| newSymbolicPaths := symbolicexpr.ComputeAllowGivenDenies(rule.origSymbolicPaths, &symbolicDeniesAndPasses) | ||
| newRule := &symbolicRule{origRule: rule.origRule, origRuleCategory: rule.origRuleCategory, | ||
| origSymbolicPaths: rule.origSymbolicPaths, allowOnlyRulePaths: *newSymbolicPaths} | ||
| allowOnlyRules = append(allowOnlyRules, newRule) | ||
| } | ||
| } | ||
| return allowOnlyRules, &newGlobalDenies | ||
| } | ||
|
|
||
| func strAllowOnlyPolicy(policy *symbolicPolicy) string { | ||
| return "Allow Only Rules\n~~~~~~~~~~~~~~~~~\ninbound rules\n" + | ||
| strAllowOnlyPathsOfRules(policy.inbound) + "\noutbound rules\n" + | ||
| strAllowOnlyPathsOfRules(policy.outbound) | ||
| } | ||
|
|
||
| func strAllowOnlyPathsOfRules(rules []*symbolicRule) string { | ||
| res := []string{} | ||
| for _, rule := range rules { | ||
| if rule.allowOnlyRulePaths == nil { | ||
| continue | ||
| } | ||
| for _, path := range rule.allowOnlyRulePaths { | ||
| res = append(res, "\t"+path.String()) | ||
| } | ||
| } | ||
| return strings.Join(res, "\n") | ||
| } |
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