80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
package htpasswd
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import (
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"bufio"
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"fmt"
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"io"
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"strings"
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"golang.org/x/crypto/bcrypt"
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)
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// htpasswd holds a path to a system .htpasswd file and the machinery to parse
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// it. Only bcrypt hash entries are supported.
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type htpasswd struct {
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entries map[string][]byte // maps username to password byte slice.
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}
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// newHTPasswd parses the reader and returns an htpasswd or an error.
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func newHTPasswd(rd io.Reader) (*htpasswd, error) {
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entries, err := parseHTPasswd(rd)
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if err != nil {
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return nil, err
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}
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return &htpasswd{entries: entries}, nil
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}
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// AuthenticateUser checks a given user:password credential against the
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// receiving HTPasswd's file. If the check passes, nil is returned.
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func (htpasswd *htpasswd) authenticateUser(username string, password string) error {
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credentials, ok := htpasswd.entries[username]
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if !ok {
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// timing attack paranoia
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bcrypt.CompareHashAndPassword([]byte{}, []byte(password))
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return ErrAuthenticationFailure
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}
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err := bcrypt.CompareHashAndPassword([]byte(credentials), []byte(password))
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if err != nil {
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return ErrAuthenticationFailure
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}
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return nil
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}
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// parseHTPasswd parses the contents of htpasswd. This will read all the
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// entries in the file, whether or not they are needed. An error is returned
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// if a syntax errors are encountered or if the reader fails.
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func parseHTPasswd(rd io.Reader) (map[string][]byte, error) {
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entries := map[string][]byte{}
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scanner := bufio.NewScanner(rd)
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var line int
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for scanner.Scan() {
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line++ // 1-based line numbering
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t := strings.TrimSpace(scanner.Text())
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if len(t) < 1 {
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continue
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}
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// lines that *begin* with a '#' are considered comments
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if t[0] == '#' {
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continue
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}
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i := strings.Index(t, ":")
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if i < 0 || i >= len(t) {
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return nil, fmt.Errorf("htpasswd: invalid entry at line %d: %q", line, scanner.Text())
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}
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entries[t[:i]] = []byte(t[i+1:])
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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return entries, nil
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}
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