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|
package policy
import (
"errors"
"fmt"
"io"
"net"
"regexp"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/yl2chen/cidranger"
"k8s.io/apimachinery/pkg/util/yaml"
"github.com/TecharoHQ/anubis/lib/policy/config"
)
var (
PolicyApplications = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "anubis_policy_results",
Help: "The results of each policy rule",
}, []string{"rule", "action"})
)
type ParsedConfig struct {
orig config.Config
Bots []Bot
DNSBL bool
DefaultDifficulty int
}
func NewParsedConfig(orig config.Config) *ParsedConfig {
return &ParsedConfig{
orig: orig,
}
}
func ParseConfig(fin io.Reader, fname string, defaultDifficulty int) (*ParsedConfig, error) {
var c config.Config
if err := yaml.NewYAMLToJSONDecoder(fin).Decode(&c); err != nil {
return nil, fmt.Errorf("can't parse policy config YAML %s: %w", fname, err)
}
if err := c.Valid(); err != nil {
return nil, err
}
var validationErrs []error
result := NewParsedConfig(c)
result.DefaultDifficulty = defaultDifficulty
for _, b := range c.Bots {
if berr := b.Valid(); berr != nil {
validationErrs = append(validationErrs, berr)
continue
}
parsedBot := Bot{
Name: b.Name,
Action: b.Action,
Headers: map[string]*regexp.Regexp{},
}
if len(b.RemoteAddr) > 0 {
parsedBot.Ranger = cidranger.NewPCTrieRanger()
for _, cidr := range b.RemoteAddr {
_, rng, err := net.ParseCIDR(cidr)
if err != nil {
return nil, fmt.Errorf("[unexpected] range %s not parsing: %w", cidr, err)
}
parsedBot.Ranger.Insert(cidranger.NewBasicRangerEntry(*rng))
}
}
if b.UserAgentRegex != nil {
userAgent, err := regexp.Compile(*b.UserAgentRegex)
if err != nil {
validationErrs = append(validationErrs, fmt.Errorf("while compiling user agent regexp: %w", err))
continue
} else {
parsedBot.UserAgent = userAgent
}
}
if b.PathRegex != nil {
path, err := regexp.Compile(*b.PathRegex)
if err != nil {
validationErrs = append(validationErrs, fmt.Errorf("while compiling path regexp: %w", err))
continue
} else {
parsedBot.Path = path
}
}
if len(b.HeadersRegex) > 0 {
for name, expr := range b.HeadersRegex {
if name == "" {
continue
}
header, err := regexp.Compile(expr)
if err != nil {
validationErrs = append(validationErrs, fmt.Errorf("while compiling header regexp: %w", err))
continue
} else {
parsedBot.Headers[name] = header
}
}
}
if b.Challenge == nil {
parsedBot.Challenge = &config.ChallengeRules{
Difficulty: defaultDifficulty,
ReportAs: defaultDifficulty,
Algorithm: config.AlgorithmFast,
}
} else {
parsedBot.Challenge = b.Challenge
if parsedBot.Challenge.Algorithm == config.AlgorithmUnknown {
parsedBot.Challenge.Algorithm = config.AlgorithmFast
}
}
result.Bots = append(result.Bots, parsedBot)
}
if len(validationErrs) > 0 {
return nil, fmt.Errorf("errors validating policy config JSON %s: %w", fname, errors.Join(validationErrs...))
}
result.DNSBL = c.DNSBL
return result, nil
}
|
