141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
package basic
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import (
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"crypto/sha1"
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"encoding/base64"
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"encoding/csv"
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"errors"
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"os"
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"regexp"
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"strings"
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"golang.org/x/crypto/bcrypt"
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)
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// ErrAuthenticationFailure A generic error message for authentication failure to be presented to agent.
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var ErrAuthenticationFailure = errors.New("Bad username or password")
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// htpasswd Holds a path to a system .htpasswd file and the machinery to parse it.
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type htpasswd struct {
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path string
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reader *csv.Reader
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}
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// AuthType Represents a particular hash function used in the htpasswd file.
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type AuthType int
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const (
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// PlainText Plain-text password storage (htpasswd -p)
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PlainText AuthType = iota
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// SHA1 sha hashed password storage (htpasswd -s)
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SHA1
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// ApacheMD5 apr iterated md5 hashing (htpasswd -m)
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ApacheMD5
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// BCrypt BCrypt adapative password hashing (htpasswd -B)
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BCrypt
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// Crypt System crypt() hashes. (htpasswd -d)
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Crypt
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)
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// String Returns a text representation of the AuthType
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func (at AuthType) String() string {
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switch at {
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case PlainText:
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return "plaintext"
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case SHA1:
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return "sha1"
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case ApacheMD5:
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return "md5"
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case BCrypt:
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return "bcrypt"
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case Crypt:
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return "system crypt"
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}
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return "unknown"
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}
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// NewHTPasswd Create a new HTPasswd with the given path to .htpasswd file.
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func NewHTPasswd(htpath string) *htpasswd {
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return &htpasswd{path: htpath}
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}
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var bcryptPrefixRegexp = regexp.MustCompile(`^\$2[ab]?y\$`)
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// GetAuthCredentialType Inspect an htpasswd file credential and guess the encryption algorithm used.
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func GetAuthCredentialType(cred string) AuthType {
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if strings.HasPrefix(cred, "{SHA}") {
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return SHA1
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}
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if strings.HasPrefix(cred, "$apr1$") {
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return ApacheMD5
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}
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if bcryptPrefixRegexp.MatchString(cred) {
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return BCrypt
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}
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// There's just not a great way to distinguish between these next two...
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if len(cred) == 13 {
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return Crypt
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}
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return PlainText
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}
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// AuthenticateUser Check a given user:password credential against the receiving HTPasswd's file.
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func (htpasswd *htpasswd) AuthenticateUser(user string, pwd string) (bool, error) {
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// Open the file.
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in, err := os.Open(htpasswd.path)
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if err != nil {
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return false, err
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}
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// Parse the contents of the standard .htpasswd until we hit the end or find a match.
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reader := csv.NewReader(in)
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reader.Comma = ':'
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reader.Comment = '#'
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reader.TrimLeadingSpace = true
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for entry, readerr := reader.Read(); entry != nil || readerr != nil; entry, readerr = reader.Read() {
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if readerr != nil {
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return false, readerr
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}
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if len(entry) == 0 {
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continue
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}
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if entry[0] == user {
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credential := entry[1]
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credType := GetAuthCredentialType(credential)
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switch credType {
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case SHA1:
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{
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sha := sha1.New()
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sha.Write([]byte(pwd))
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hash := base64.StdEncoding.EncodeToString(sha.Sum(nil))
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return entry[1][5:] == hash, nil
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}
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case ApacheMD5:
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{
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return false, errors.New(ApacheMD5.String() + " htpasswd hash function not yet supported")
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}
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case BCrypt:
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{
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err := bcrypt.CompareHashAndPassword([]byte(credential), []byte(pwd))
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if err != nil {
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return false, err
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}
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return true, nil
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}
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case Crypt:
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{
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return false, errors.New(Crypt.String() + " htpasswd hash function not yet supported")
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}
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case PlainText:
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{
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if pwd == credential {
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return true, nil
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}
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return false, ErrAuthenticationFailure
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}
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}
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}
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}
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return false, ErrAuthenticationFailure
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}
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