func validateEmail(ctx context.Context, address string, resolver bdns.DNSResolver) (prob *probs.ProblemDetails) {
emails, err := mail.ParseAddressList(address)
if err != nil {
return probs.InvalidEmail(unparseableEmailDetail)
}
if len(emails) > 1 {
return probs.InvalidEmail(multipleAddressDetail)
}
splitEmail := strings.SplitN(emails[0].Address, "@", -1)
domain := strings.ToLower(splitEmail[len(splitEmail)-1])
var resultMX []string
var resultA []net.IP
var errMX, errA error
var wg sync.WaitGroup
wg.Add(2)
go func() {
resultMX, errMX = resolver.LookupMX(ctx, domain)
wg.Done()
}()
go func() {
resultA, errA = resolver.LookupHost(ctx, domain)
wg.Done()
}()
wg.Wait()
// We treat timeouts as non-failures for best-effort email validation
// See: https://github.com/letsencrypt/boulder/issues/2260
if problemIsTimeout(errMX) || problemIsTimeout(errA) {
return nil
}
if errMX != nil {
prob := bdns.ProblemDetailsFromDNSError(errMX)
prob.Type = probs.InvalidEmailProblem
return prob
} else if len(resultMX) > 0 {
return nil
}
if errA != nil {
prob := bdns.ProblemDetailsFromDNSError(errA)
prob.Type = probs.InvalidEmailProblem
return prob
} else if len(resultA) > 0 {
return nil
}
return probs.InvalidEmail(emptyDNSResponseDetail)
}
func validateEmail(ctx context.Context, address string, resolver bdns.DNSResolver) (prob *probs.ProblemDetails) {
emails, err := mail.ParseAddressList(address)
if err != nil {
return probs.InvalidEmail(unparseableEmailDetail)
}
if len(emails) > 1 {
return probs.InvalidEmail(multipleAddressDetail)
}
splitEmail := strings.SplitN(emails[0].Address, "@", -1)
domain := strings.ToLower(splitEmail[len(splitEmail)-1])
var resultMX []string
var resultA []net.IP
var errMX, errA error
var wg sync.WaitGroup
wg.Add(2)
go func() {
resultMX, errMX = resolver.LookupMX(ctx, domain)
wg.Done()
}()
go func() {
resultA, errA = resolver.LookupHost(ctx, domain)
wg.Done()
}()
wg.Wait()
if errMX != nil {
prob := bdns.ProblemDetailsFromDNSError(errMX)
prob.Type = probs.InvalidEmailProblem
return prob
} else if len(resultMX) > 0 {
return nil
}
if errA != nil {
prob := bdns.ProblemDetailsFromDNSError(errA)
prob.Type = probs.InvalidEmailProblem
return prob
} else if len(resultA) > 0 {
return nil
}
return probs.InvalidEmail(emptyDNSResponseDetail)
}