* add proper whitelist metrics : both its own table and an extension to acquis metrics to track discarded/whitelisted lines
572 lines
18 KiB
Go
572 lines
18 KiB
Go
package parser
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import (
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/antonmedv/expr"
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"github.com/antonmedv/expr/vm"
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"github.com/davecgh/go-spew/spew"
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"github.com/prometheus/client_golang/prometheus"
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log "github.com/sirupsen/logrus"
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yaml "gopkg.in/yaml.v2"
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"github.com/crowdsecurity/grokky"
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"github.com/crowdsecurity/crowdsec/pkg/cache"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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)
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type Node struct {
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FormatVersion string `yaml:"format"`
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//Enable config + runtime debug of node via config o/
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Debug bool `yaml:"debug,omitempty"`
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//If enabled, the node (and its child) will report their own statistics
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Profiling bool `yaml:"profiling,omitempty"`
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//Name, author, description and reference(s) for parser pattern
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Name string `yaml:"name,omitempty"`
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Author string `yaml:"author,omitempty"`
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Description string `yaml:"description,omitempty"`
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References []string `yaml:"references,omitempty"`
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//if debug is present in the node, keep its specific Logger in runtime structure
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Logger *log.Entry `yaml:"-"`
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//This is mostly a hack to make writing less repetitive.
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//relying on stage, we know which field to parse, and we
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//can also promote log to next stage on success
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Stage string `yaml:"stage,omitempty"`
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//OnSuccess allows to tag a node to be able to move log to next stage on success
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OnSuccess string `yaml:"onsuccess,omitempty"`
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rn string //this is only for us in debug, a random generated name for each node
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//Filter is executed at runtime (with current log line as context)
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//and must succeed or node is exited
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Filter string `yaml:"filter,omitempty"`
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RunTimeFilter *vm.Program `yaml:"-" json:"-"` //the actual compiled filter
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//If node has leafs, execute all of them until one asks for a 'break'
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LeavesNodes []Node `yaml:"nodes,omitempty"`
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//Flag used to describe when to 'break' or return an 'error'
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EnrichFunctions EnricherCtx
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/* If the node is actually a leaf, it can have : grok, enrich, statics */
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//pattern_syntax are named grok patterns that are re-utilized over several grok patterns
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SubGroks yaml.MapSlice `yaml:"pattern_syntax,omitempty"`
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//Holds a grok pattern
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Grok GrokPattern `yaml:"grok,omitempty"`
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//Statics can be present in any type of node and is executed last
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Statics []ExtraField `yaml:"statics,omitempty"`
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//Stash allows to capture data from the log line and store it in an accessible cache
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Stash []DataCapture `yaml:"stash,omitempty"`
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//Whitelists
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Whitelist Whitelist `yaml:"whitelist,omitempty"`
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Data []*types.DataSource `yaml:"data,omitempty"`
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}
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func (n *Node) validate(pctx *UnixParserCtx, ectx EnricherCtx) error {
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//stage is being set automagically
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if n.Stage == "" {
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return fmt.Errorf("stage needs to be an existing stage")
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}
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/* "" behaves like continue */
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if n.OnSuccess != "continue" && n.OnSuccess != "next_stage" && n.OnSuccess != "" {
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return fmt.Errorf("onsuccess '%s' not continue,next_stage", n.OnSuccess)
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}
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if n.Filter != "" && n.RunTimeFilter == nil {
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return fmt.Errorf("non-empty filter '%s' was not compiled", n.Filter)
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}
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if n.Grok.RunTimeRegexp != nil || n.Grok.TargetField != "" {
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if n.Grok.TargetField == "" && n.Grok.ExpValue == "" {
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return fmt.Errorf("grok requires 'expression' or 'apply_on'")
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}
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if n.Grok.RegexpName == "" && n.Grok.RegexpValue == "" {
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return fmt.Errorf("grok needs 'pattern' or 'name'")
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}
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}
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for idx, static := range n.Statics {
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if static.Method != "" {
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if static.ExpValue == "" {
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return fmt.Errorf("static %d : when method is set, expression must be present", idx)
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}
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if _, ok := ectx.Registered[static.Method]; !ok {
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log.Warningf("the method '%s' doesn't exist or the plugin has not been initialized", static.Method)
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}
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} else {
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if static.Meta == "" && static.Parsed == "" && static.TargetByName == "" {
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return fmt.Errorf("static %d : at least one of meta/event/target must be set", idx)
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}
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if static.Value == "" && static.RunTimeValue == nil {
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return fmt.Errorf("static %d value or expression must be set", idx)
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}
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}
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}
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for idx, stash := range n.Stash {
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if stash.Name == "" {
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return fmt.Errorf("stash %d : name must be set", idx)
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}
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if stash.Value == "" {
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return fmt.Errorf("stash %s : value expression must be set", stash.Name)
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}
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if stash.Key == "" {
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return fmt.Errorf("stash %s : key expression must be set", stash.Name)
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}
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if stash.TTL == "" {
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return fmt.Errorf("stash %s : ttl must be set", stash.Name)
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}
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if stash.Strategy == "" {
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stash.Strategy = "LRU"
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}
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//should be configurable
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if stash.MaxMapSize == 0 {
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stash.MaxMapSize = 100
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}
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}
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return nil
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}
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func (n *Node) process(p *types.Event, ctx UnixParserCtx, expressionEnv map[string]interface{}) (bool, error) {
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var NodeState bool
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var NodeHasOKGrok bool
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clog := n.Logger
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cachedExprEnv := expressionEnv
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clog.Tracef("Event entering node")
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if n.RunTimeFilter != nil {
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//Evaluate node's filter
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output, err := exprhelpers.Run(n.RunTimeFilter, cachedExprEnv, clog, n.Debug)
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if err != nil {
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clog.Warningf("failed to run filter : %v", err)
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clog.Debugf("Event leaving node : ko")
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return false, nil
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}
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switch out := output.(type) {
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case bool:
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if !out {
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clog.Debugf("Event leaving node : ko (failed filter)")
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return false, nil
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}
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default:
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clog.Warningf("Expr '%s' returned non-bool, abort : %T", n.Filter, output)
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clog.Debugf("Event leaving node : ko")
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return false, nil
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}
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NodeState = true
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} else {
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clog.Tracef("Node has not filter, enter")
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NodeState = true
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}
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if n.Name != "" {
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NodesHits.With(prometheus.Labels{"source": p.Line.Src, "type": p.Line.Module, "name": n.Name}).Inc()
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}
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exprErr := error(nil)
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isWhitelisted := n.CheckIPsWL(p)
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if !isWhitelisted {
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isWhitelisted, exprErr = n.CheckExprWL(cachedExprEnv, p)
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}
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if exprErr != nil {
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// Previous code returned nil if there was an error, so we keep this behavior
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return false, nil //nolint:nilerr
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}
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if isWhitelisted && !p.Whitelisted {
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p.Whitelisted = true
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p.WhitelistReason = n.Whitelist.Reason
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/*huglily wipe the ban order if the event is whitelisted and it's an overflow */
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if p.Type == types.OVFLW { /*don't do this at home kids */
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ips := []string{}
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for k := range p.Overflow.Sources {
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ips = append(ips, k)
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}
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clog.Infof("Ban for %s whitelisted, reason [%s]", strings.Join(ips, ","), n.Whitelist.Reason)
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p.Overflow.Whitelisted = true
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}
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}
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//Process grok if present, should be exclusive with nodes :)
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gstr := ""
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if n.Grok.RunTimeRegexp != nil {
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clog.Tracef("Processing grok pattern : %s : %p", n.Grok.RegexpName, n.Grok.RunTimeRegexp)
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//for unparsed, parsed etc. set sensible defaults to reduce user hassle
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if n.Grok.TargetField != "" {
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//it's a hack to avoid using real reflect
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if n.Grok.TargetField == "Line.Raw" {
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gstr = p.Line.Raw
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} else if val, ok := p.Parsed[n.Grok.TargetField]; ok {
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gstr = val
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} else {
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clog.Debugf("(%s) target field '%s' doesn't exist in %v", n.rn, n.Grok.TargetField, p.Parsed)
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NodeState = false
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}
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} else if n.Grok.RunTimeValue != nil {
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output, err := exprhelpers.Run(n.Grok.RunTimeValue, cachedExprEnv, clog, n.Debug)
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if err != nil {
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clog.Warningf("failed to run RunTimeValue : %v", err)
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NodeState = false
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}
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switch out := output.(type) {
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case string:
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gstr = out
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case int:
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gstr = fmt.Sprintf("%d", out)
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case float64, float32:
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gstr = fmt.Sprintf("%f", out)
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default:
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clog.Errorf("unexpected return type for RunTimeValue : %T", output)
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}
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}
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var groklabel string
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if n.Grok.RegexpName == "" {
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groklabel = fmt.Sprintf("%5.5s...", n.Grok.RegexpValue)
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} else {
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groklabel = n.Grok.RegexpName
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}
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grok := n.Grok.RunTimeRegexp.Parse(gstr)
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if len(grok) > 0 {
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/*tag explicitly that the *current* node had a successful grok pattern. it's important to know success state*/
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NodeHasOKGrok = true
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clog.Debugf("+ Grok '%s' returned %d entries to merge in Parsed", groklabel, len(grok))
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//We managed to grok stuff, merged into parse
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for k, v := range grok {
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clog.Debugf("\t.Parsed['%s'] = '%s'", k, v)
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p.Parsed[k] = v
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}
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// if the grok succeed, process associated statics
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err := n.ProcessStatics(n.Grok.Statics, p)
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if err != nil {
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clog.Errorf("(%s) Failed to process statics : %v", n.rn, err)
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return false, err
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}
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} else {
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//grok failed, node failed
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clog.Debugf("+ Grok '%s' didn't return data on '%s'", groklabel, gstr)
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NodeState = false
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}
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} else {
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clog.Tracef("! No grok pattern : %p", n.Grok.RunTimeRegexp)
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}
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//Process the stash (data collection) if : a grok was present and succeeded, or if there is no grok
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if NodeHasOKGrok || n.Grok.RunTimeRegexp == nil {
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for idx, stash := range n.Stash {
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var value string
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var key string
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if stash.ValueExpression == nil {
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clog.Warningf("Stash %d has no value expression, skipping", idx)
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continue
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}
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if stash.KeyExpression == nil {
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clog.Warningf("Stash %d has no key expression, skipping", idx)
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continue
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}
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//collect the data
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output, err := exprhelpers.Run(stash.ValueExpression, cachedExprEnv, clog, n.Debug)
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if err != nil {
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clog.Warningf("Error while running stash val expression : %v", err)
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}
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//can we expect anything else than a string ?
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switch output := output.(type) {
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case string:
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value = output
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default:
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clog.Warningf("unexpected type %t (%v) while running '%s'", output, output, stash.Value)
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continue
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}
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//collect the key
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output, err = exprhelpers.Run(stash.KeyExpression, cachedExprEnv, clog, n.Debug)
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if err != nil {
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clog.Warningf("Error while running stash key expression : %v", err)
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}
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//can we expect anything else than a string ?
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switch output := output.(type) {
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case string:
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key = output
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default:
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clog.Warningf("unexpected type %t (%v) while running '%s'", output, output, stash.Key)
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continue
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}
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cache.SetKey(stash.Name, key, value, &stash.TTLVal)
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}
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}
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//Iterate on leafs
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for _, leaf := range n.LeavesNodes {
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ret, err := leaf.process(p, ctx, cachedExprEnv)
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if err != nil {
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clog.Tracef("\tNode (%s) failed : %v", leaf.rn, err)
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clog.Debugf("Event leaving node : ko")
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return false, err
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}
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clog.Tracef("\tsub-node (%s) ret : %v (strategy:%s)", leaf.rn, ret, n.OnSuccess)
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if ret {
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NodeState = true
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/* if child is successful, stop processing */
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if n.OnSuccess == "next_stage" {
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clog.Debugf("child is success, OnSuccess=next_stage, skip")
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break
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}
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} else if !NodeHasOKGrok {
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/*
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If the parent node has a successful grok pattern, it's state will stay successful even if one or more chil fails.
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If the parent node is a skeleton node (no grok pattern), then at least one child must be successful for it to be a success.
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*/
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NodeState = false
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}
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}
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/*todo : check if a node made the state change ?*/
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/* should the childs inherit the on_success behavior */
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clog.Tracef("State after nodes : %v", NodeState)
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//grok or leafs failed, don't process statics
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if !NodeState {
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if n.Name != "" {
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NodesHitsKo.With(prometheus.Labels{"source": p.Line.Src, "type": p.Line.Module, "name": n.Name}).Inc()
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}
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clog.Debugf("Event leaving node : ko")
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return NodeState, nil
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}
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if n.Name != "" {
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NodesHitsOk.With(prometheus.Labels{"source": p.Line.Src, "type": p.Line.Module, "name": n.Name}).Inc()
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}
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/*
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This is to apply statics when the node either was whitelisted, or is not a whitelist (it has no expr/ips wl)
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It is overconvoluted and should be simplified
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*/
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if len(n.Statics) > 0 && (isWhitelisted || !n.ContainsWLs()) {
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clog.Debugf("+ Processing %d statics", len(n.Statics))
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// if all else is good in whitelist, process node's statics
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err := n.ProcessStatics(n.Statics, p)
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if err != nil {
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clog.Errorf("Failed to process statics : %v", err)
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return false, err
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}
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} else {
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clog.Tracef("! No node statics")
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}
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if NodeState {
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clog.Debugf("Event leaving node : ok")
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log.Tracef("node is successful, check strategy")
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if n.OnSuccess == "next_stage" {
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idx := stageidx(p.Stage, ctx.Stages)
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//we're at the last stage
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if idx+1 == len(ctx.Stages) {
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clog.Debugf("node reached the last stage : %s", p.Stage)
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} else {
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clog.Debugf("move Event from stage %s to %s", p.Stage, ctx.Stages[idx+1])
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p.Stage = ctx.Stages[idx+1]
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}
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} else {
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clog.Tracef("no strategy on success (%s), continue !", n.OnSuccess)
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}
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} else {
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clog.Debugf("Event leaving node : ko")
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}
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clog.Tracef("Node successful, continue")
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return NodeState, nil
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}
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func (n *Node) compile(pctx *UnixParserCtx, ectx EnricherCtx) error {
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var err error
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var valid bool
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valid = false
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dumpr := spew.ConfigState{MaxDepth: 1, DisablePointerAddresses: true}
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n.rn = seed.Generate()
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n.EnrichFunctions = ectx
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log.Tracef("compile, node is %s", n.Stage)
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/* if the node has debugging enabled, create a specific logger with debug
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that will be used only for processing this node ;) */
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if n.Debug {
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var clog = log.New()
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if err = types.ConfigureLogger(clog); err != nil {
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log.Fatalf("While creating bucket-specific logger : %s", err)
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}
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clog.SetLevel(log.DebugLevel)
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n.Logger = clog.WithFields(log.Fields{
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"id": n.rn,
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})
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n.Logger.Infof("%s has debug enabled", n.Name)
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} else {
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/* else bind it to the default one (might find something more elegant here)*/
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n.Logger = log.WithFields(log.Fields{
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"id": n.rn,
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})
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}
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/* display info about top-level nodes, they should be the only one with explicit stage name ?*/
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n.Logger = n.Logger.WithFields(log.Fields{"stage": n.Stage, "name": n.Name})
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n.Logger.Tracef("Compiling : %s", dumpr.Sdump(n))
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//compile filter if present
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if n.Filter != "" {
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n.RunTimeFilter, err = expr.Compile(n.Filter, exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...)
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if err != nil {
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return fmt.Errorf("compilation of '%s' failed: %v", n.Filter, err)
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}
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}
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/* handle pattern_syntax and groks */
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for _, pattern := range n.SubGroks {
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n.Logger.Tracef("Adding subpattern '%s' : '%s'", pattern.Key, pattern.Value)
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if err = pctx.Grok.Add(pattern.Key.(string), pattern.Value.(string)); err != nil {
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if errors.Is(err, grokky.ErrAlreadyExist) {
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n.Logger.Warningf("grok '%s' already registred", pattern.Key)
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continue
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}
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n.Logger.Errorf("Unable to compile subpattern %s : %v", pattern.Key, err)
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return err
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}
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}
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/* load grok by name or compile in-place */
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if n.Grok.RegexpName != "" {
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n.Logger.Tracef("+ Regexp Compilation '%s'", n.Grok.RegexpName)
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n.Grok.RunTimeRegexp, err = pctx.Grok.Get(n.Grok.RegexpName)
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if err != nil {
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return fmt.Errorf("unable to find grok '%s' : %v", n.Grok.RegexpName, err)
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}
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if n.Grok.RunTimeRegexp == nil {
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return fmt.Errorf("empty grok '%s'", n.Grok.RegexpName)
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}
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n.Logger.Tracef("%s regexp: %s", n.Grok.RegexpName, n.Grok.RunTimeRegexp.String())
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valid = true
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} else if n.Grok.RegexpValue != "" {
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if strings.HasSuffix(n.Grok.RegexpValue, "\n") {
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n.Logger.Debugf("Beware, pattern ends with \\n : '%s'", n.Grok.RegexpValue)
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}
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n.Grok.RunTimeRegexp, err = pctx.Grok.Compile(n.Grok.RegexpValue)
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if err != nil {
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return fmt.Errorf("failed to compile grok '%s': %v", n.Grok.RegexpValue, err)
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}
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if n.Grok.RunTimeRegexp == nil {
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// We shouldn't be here because compilation succeeded, so regexp shouldn't be nil
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return fmt.Errorf("grok compilation failure: %s", n.Grok.RegexpValue)
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}
|
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n.Logger.Tracef("%s regexp : %s", n.Grok.RegexpValue, n.Grok.RunTimeRegexp.String())
|
|
valid = true
|
|
}
|
|
|
|
/*if grok source is an expression*/
|
|
if n.Grok.ExpValue != "" {
|
|
n.Grok.RunTimeValue, err = expr.Compile(n.Grok.ExpValue,
|
|
exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...)
|
|
if err != nil {
|
|
return fmt.Errorf("while compiling grok's expression: %w", err)
|
|
}
|
|
}
|
|
|
|
/* load grok statics */
|
|
//compile expr statics if present
|
|
for idx := range n.Grok.Statics {
|
|
if n.Grok.Statics[idx].ExpValue != "" {
|
|
n.Grok.Statics[idx].RunTimeValue, err = expr.Compile(n.Grok.Statics[idx].ExpValue,
|
|
exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
valid = true
|
|
}
|
|
|
|
/* load data capture (stash) */
|
|
for i, stash := range n.Stash {
|
|
n.Stash[i].ValueExpression, err = expr.Compile(stash.Value,
|
|
exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...)
|
|
if err != nil {
|
|
return fmt.Errorf("while compiling stash value expression: %w", err)
|
|
}
|
|
|
|
n.Stash[i].KeyExpression, err = expr.Compile(stash.Key,
|
|
exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...)
|
|
if err != nil {
|
|
return fmt.Errorf("while compiling stash key expression: %w", err)
|
|
}
|
|
|
|
n.Stash[i].TTLVal, err = time.ParseDuration(stash.TTL)
|
|
if err != nil {
|
|
return fmt.Errorf("while parsing stash ttl: %w", err)
|
|
}
|
|
|
|
logLvl := n.Logger.Logger.GetLevel()
|
|
//init the cache, does it make sense to create it here just to be sure everything is fine ?
|
|
if err = cache.CacheInit(cache.CacheCfg{
|
|
Size: n.Stash[i].MaxMapSize,
|
|
TTL: n.Stash[i].TTLVal,
|
|
Name: n.Stash[i].Name,
|
|
Strategy: n.Stash[i].Strategy,
|
|
LogLevel: &logLvl,
|
|
}); err != nil {
|
|
return fmt.Errorf("while initializing cache: %w", err)
|
|
}
|
|
}
|
|
|
|
/* compile leafs if present */
|
|
for idx := range n.LeavesNodes {
|
|
if n.LeavesNodes[idx].Name == "" {
|
|
n.LeavesNodes[idx].Name = fmt.Sprintf("child-%s", n.Name)
|
|
}
|
|
/*propagate debug/stats to child nodes*/
|
|
if !n.LeavesNodes[idx].Debug && n.Debug {
|
|
n.LeavesNodes[idx].Debug = true
|
|
}
|
|
if !n.LeavesNodes[idx].Profiling && n.Profiling {
|
|
n.LeavesNodes[idx].Profiling = true
|
|
}
|
|
n.LeavesNodes[idx].Stage = n.Stage
|
|
err = n.LeavesNodes[idx].compile(pctx, ectx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
valid = true
|
|
}
|
|
|
|
/* load statics if present */
|
|
for idx := range n.Statics {
|
|
if n.Statics[idx].ExpValue != "" {
|
|
n.Statics[idx].RunTimeValue, err = expr.Compile(n.Statics[idx].ExpValue, exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...)
|
|
if err != nil {
|
|
n.Logger.Errorf("Statics Compilation failed %v.", err)
|
|
return err
|
|
}
|
|
}
|
|
valid = true
|
|
}
|
|
|
|
/* compile whitelists if present */
|
|
whitelistValid, err := n.CompileWLs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
valid = valid || whitelistValid
|
|
|
|
if !valid {
|
|
/* node is empty, error force return */
|
|
n.Logger.Error("Node is empty or invalid, abort")
|
|
n.Stage = ""
|
|
return fmt.Errorf("Node is empty")
|
|
}
|
|
|
|
if err := n.validate(pctx, ectx); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|