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88 lines
2.3 KiB
88 lines
2.3 KiB
package openid
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import (
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"errors"
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"flag"
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"fmt"
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"sync"
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"time"
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)
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var maxNonceAge = flag.Duration("openid-max-nonce-age",
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60*time.Second,
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"Maximum accepted age for openid nonces. The bigger, the more"+
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"memory is needed to store used nonces.")
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type NonceStore interface {
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// Returns nil if accepted, an error otherwise.
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Accept(endpoint, nonce string) error
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}
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type Nonce struct {
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T time.Time
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S string
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}
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type SimpleNonceStore struct {
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store map[string][]*Nonce
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mutex *sync.Mutex
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}
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func NewSimpleNonceStore() *SimpleNonceStore {
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return &SimpleNonceStore{store: map[string][]*Nonce{}, mutex: &sync.Mutex{}}
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}
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func (d *SimpleNonceStore) Accept(endpoint, nonce string) error {
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// Value: A string 255 characters or less in length, that MUST be
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// unique to this particular successful authentication response.
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if len(nonce) < 20 || len(nonce) > 256 {
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return errors.New("Invalid nonce")
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}
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// The nonce MUST start with the current time on the server, and MAY
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// contain additional ASCII characters in the range 33-126 inclusive
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// (printable non-whitespace characters), as necessary to make each
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// response unique. The date and time MUST be formatted as specified in
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// section 5.6 of [RFC3339], with the following restrictions:
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// All times must be in the UTC timezone, indicated with a "Z". No
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// fractional seconds are allowed For example:
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// 2005-05-15T17:11:51ZUNIQUE
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ts, err := time.Parse(time.RFC3339, nonce[0:20])
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if err != nil {
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return err
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}
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now := time.Now()
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diff := now.Sub(ts)
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if diff > *maxNonceAge {
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return fmt.Errorf("Nonce too old: %.2fs", diff.Seconds())
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}
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s := nonce[20:]
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// Meh.. now we have to use a mutex, to protect that map from
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// concurrent access. Could put a go routine in charge of it
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// though.
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d.mutex.Lock()
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defer d.mutex.Unlock()
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if nonces, hasOp := d.store[endpoint]; hasOp {
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// Delete old nonces while we are at it.
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newNonces := []*Nonce{{ts, s}}
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for _, n := range nonces {
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if n.T == ts && n.S == s {
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// If return early, just ignore the filtered list
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// we have been building so far...
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return errors.New("Nonce already used")
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}
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if now.Sub(n.T) < *maxNonceAge {
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newNonces = append(newNonces, n)
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}
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}
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d.store[endpoint] = newNonces
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} else {
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d.store[endpoint] = []*Nonce{{ts, s}}
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}
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return nil
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}
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