mail_auth/spf/
verify.rs

1/*
2 * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
3 *
4 * SPDX-License-Identifier: Apache-2.0 OR MIT
5 */
6
7use super::{Macro, Mechanism, Qualifier, Spf, Variables};
8use crate::{
9    Error, MX, MessageAuthenticator, Parameters, ResolverCache, SpfOutput, SpfResult, Txt,
10    common::cache::NoCache,
11};
12use std::{
13    net::{IpAddr, Ipv4Addr, Ipv6Addr},
14    sync::Arc,
15    time::Instant,
16};
17
18pub struct SpfParameters<'x> {
19    ip: IpAddr,
20    domain: &'x str,
21    helo_domain: &'x str,
22    host_domain: &'x str,
23    sender: Sender<'x>,
24}
25
26enum Sender<'x> {
27    Ehlo(String),
28    MailFrom(&'x str),
29    Full(&'x str),
30}
31
32#[allow(clippy::iter_skip_zero)]
33impl MessageAuthenticator {
34    /// Verifies the SPF record of a domain
35    pub async fn verify_spf<'x, TXT, MXX, IPV4, IPV6, PTR>(
36        &self,
37        params: impl Into<Parameters<'x, SpfParameters<'x>, TXT, MXX, IPV4, IPV6, PTR>>,
38    ) -> SpfOutput
39    where
40        TXT: ResolverCache<Box<str>, Txt> + 'x,
41        MXX: ResolverCache<Box<str>, Arc<[MX]>> + 'x,
42        IPV4: ResolverCache<Box<str>, Arc<[Ipv4Addr]>> + 'x,
43        IPV6: ResolverCache<Box<str>, Arc<[Ipv6Addr]>> + 'x,
44        PTR: ResolverCache<IpAddr, Arc<[Box<str>]>> + 'x,
45    {
46        let params = params.into();
47        match &params.params.sender {
48            Sender::Full(sender) => {
49                // Verify HELO identity
50                let output = self
51                    .check_host(params.clone_with(SpfParameters::verify_ehlo(
52                        params.params.ip,
53                        params.params.helo_domain,
54                        params.params.host_domain,
55                    )))
56                    .await;
57                if matches!(output.result(), SpfResult::Pass) {
58                    // Verify MAIL FROM identity
59                    self.check_host(params.clone_with(SpfParameters::verify_mail_from(
60                        params.params.ip,
61                        params.params.helo_domain,
62                        params.params.host_domain,
63                        sender,
64                    )))
65                    .await
66                } else {
67                    output
68                }
69            }
70            _ => self.check_host(params).await,
71        }
72    }
73
74    #[allow(clippy::while_let_on_iterator)]
75    #[allow(clippy::iter_skip_zero)]
76    pub async fn check_host<'x, TXT, MXX, IPV4, IPV6, PTR>(
77        &self,
78        params: Parameters<'x, SpfParameters<'x>, TXT, MXX, IPV4, IPV6, PTR>,
79    ) -> SpfOutput
80    where
81        TXT: ResolverCache<Box<str>, Txt>,
82        MXX: ResolverCache<Box<str>, Arc<[MX]>>,
83        IPV4: ResolverCache<Box<str>, Arc<[Ipv4Addr]>>,
84        IPV6: ResolverCache<Box<str>, Arc<[Ipv6Addr]>>,
85        PTR: ResolverCache<IpAddr, Arc<[Box<str>]>>,
86    {
87        let domain = params.params.domain;
88        let ip = params.params.ip;
89        let helo_domain = params.params.helo_domain;
90        let host_domain = params.params.host_domain;
91        let sender = match &params.params.sender {
92            Sender::Ehlo(sender) => sender.as_str(),
93            Sender::MailFrom(sender) => sender,
94            Sender::Full(sender) => sender,
95        };
96
97        let output = SpfOutput::new(domain.to_string());
98        if domain.is_empty() || domain.len() > 255 || !domain.has_valid_labels() {
99            return output.with_result(SpfResult::None);
100        }
101        let mut vars = Variables::new();
102        let mut has_p_var = false;
103        vars.set_ip(&ip);
104        if !sender.is_empty() {
105            vars.set_sender(sender.as_bytes());
106        } else {
107            vars.set_sender(format!("postmaster@{domain}").into_bytes());
108        }
109        vars.set_domain(domain.as_bytes());
110        vars.set_host_domain(host_domain.as_bytes());
111        vars.set_helo_domain(helo_domain.as_bytes());
112
113        let mut lookup_limit = LookupLimit::new();
114        let mut spf_record = match self.txt_lookup::<Spf>(domain, params.cache_txt).await {
115            Ok(spf_record) => spf_record,
116            Err(err) => return output.with_result(err.into()),
117        };
118
119        let mut domain = domain.to_string();
120        let mut include_stack = Vec::new();
121
122        let mut result = None;
123        let mut directives = spf_record.directives.iter().enumerate().skip(0);
124
125        loop {
126            while let Some((pos, directive)) = directives.next() {
127                if !has_p_var && directive.mechanism.needs_ptr() {
128                    if !lookup_limit.can_lookup() {
129                        return output
130                            .with_result(SpfResult::PermError)
131                            .with_report(&spf_record);
132                    }
133                    if let Some(ptr) = self
134                        .ptr_lookup(ip, params.cache_ptr)
135                        .await
136                        .ok()
137                        .and_then(|ptrs| ptrs.first().map(|ptr| ptr.as_bytes().to_vec()))
138                    {
139                        vars.set_validated_domain(ptr);
140                    }
141                    has_p_var = true;
142                }
143
144                let matches = match &directive.mechanism {
145                    Mechanism::All => true,
146                    Mechanism::Ip4 { addr, mask } => ip.matches_ipv4_mask(addr, *mask),
147                    Mechanism::Ip6 { addr, mask } => ip.matches_ipv6_mask(addr, *mask),
148                    Mechanism::A {
149                        macro_string,
150                        ip4_mask,
151                        ip6_mask,
152                    } => {
153                        if !lookup_limit.can_lookup() {
154                            return output
155                                .with_result(SpfResult::PermError)
156                                .with_report(&spf_record);
157                        }
158                        match self
159                            .ip_matches(
160                                macro_string.eval(&vars, &domain, true).as_ref(),
161                                ip,
162                                *ip4_mask,
163                                *ip6_mask,
164                                params.cache_ipv4,
165                                params.cache_ipv6,
166                            )
167                            .await
168                        {
169                            Ok(true) => true,
170                            Ok(false) | Err(Error::DnsRecordNotFound(_)) => false,
171                            Err(_) => {
172                                return output
173                                    .with_result(SpfResult::TempError)
174                                    .with_report(&spf_record);
175                            }
176                        }
177                    }
178                    Mechanism::Mx {
179                        macro_string,
180                        ip4_mask,
181                        ip6_mask,
182                    } => {
183                        if !lookup_limit.can_lookup() {
184                            return output
185                                .with_result(SpfResult::PermError)
186                                .with_report(&spf_record);
187                        }
188
189                        let mut matches = false;
190                        match self
191                            .mx_lookup(&*macro_string.eval(&vars, &domain, true), params.cache_mx)
192                            .await
193                        {
194                            Ok(records) => {
195                                for (mx_num, exchange) in records
196                                    .iter()
197                                    .flat_map(|mx| mx.exchanges.iter())
198                                    .enumerate()
199                                {
200                                    if mx_num > 9 {
201                                        return output
202                                            .with_result(SpfResult::PermError)
203                                            .with_report(&spf_record);
204                                    }
205
206                                    match self
207                                        .ip_matches(
208                                            exchange,
209                                            ip,
210                                            *ip4_mask,
211                                            *ip6_mask,
212                                            params.cache_ipv4,
213                                            params.cache_ipv6,
214                                        )
215                                        .await
216                                    {
217                                        Ok(true) => {
218                                            matches = true;
219                                            break;
220                                        }
221                                        Ok(false) | Err(Error::DnsRecordNotFound(_)) => (),
222                                        Err(_) => {
223                                            return output
224                                                .with_result(SpfResult::TempError)
225                                                .with_report(&spf_record);
226                                        }
227                                    }
228                                }
229                            }
230                            Err(Error::DnsRecordNotFound(_)) => (),
231                            Err(_) => {
232                                return output
233                                    .with_result(SpfResult::TempError)
234                                    .with_report(&spf_record);
235                            }
236                        }
237                        matches
238                    }
239                    Mechanism::Include { macro_string } => {
240                        if !lookup_limit.can_lookup() {
241                            return output
242                                .with_result(SpfResult::PermError)
243                                .with_report(&spf_record);
244                        }
245
246                        let target_name = macro_string.eval(&vars, &domain, true);
247                        match self
248                            .txt_lookup::<Spf>(&*target_name, params.cache_txt)
249                            .await
250                        {
251                            Ok(included_spf) => {
252                                let new_domain = target_name.to_string();
253                                include_stack.push((
254                                    std::mem::replace(&mut spf_record, included_spf),
255                                    pos,
256                                    domain,
257                                ));
258                                directives = spf_record.directives.iter().enumerate().skip(0);
259                                domain = new_domain;
260                                vars.set_domain(domain.as_bytes().to_vec());
261                                continue;
262                            }
263                            Err(
264                                Error::DnsRecordNotFound(_)
265                                | Error::InvalidRecordType
266                                | Error::ParseError,
267                            ) => {
268                                return output
269                                    .with_result(SpfResult::PermError)
270                                    .with_report(&spf_record);
271                            }
272                            Err(_) => {
273                                return output
274                                    .with_result(SpfResult::TempError)
275                                    .with_report(&spf_record);
276                            }
277                        }
278                    }
279                    Mechanism::Ptr { macro_string } => {
280                        if !lookup_limit.can_lookup() {
281                            return output
282                                .with_result(SpfResult::PermError)
283                                .with_report(&spf_record);
284                        }
285
286                        let target_addr = macro_string.eval(&vars, &domain, true).to_lowercase();
287                        let target_sub_addr = format!(".{target_addr}");
288                        let mut matches = false;
289
290                        if let Ok(records) = self.ptr_lookup(ip, params.cache_ptr).await {
291                            for record in records.iter() {
292                                if lookup_limit.can_lookup()
293                                    && let Ok(true) = self
294                                        .ip_matches(
295                                            record,
296                                            ip,
297                                            u32::MAX,
298                                            u128::MAX,
299                                            params.cache_ipv4,
300                                            params.cache_ipv6,
301                                        )
302                                        .await
303                                {
304                                    matches = record.as_ref() == target_addr.as_str()
305                                        || record
306                                            .strip_suffix('.')
307                                            .unwrap_or(record.as_ref())
308                                            .ends_with(&target_sub_addr);
309                                    if matches {
310                                        break;
311                                    }
312                                }
313                            }
314                        }
315                        matches
316                    }
317                    Mechanism::Exists { macro_string } => {
318                        if !lookup_limit.can_lookup() {
319                            return output
320                                .with_result(SpfResult::PermError)
321                                .with_report(&spf_record);
322                        }
323
324                        if let Ok(result) = self
325                            .exists(
326                                &*macro_string.eval(&vars, &domain, true),
327                                params.cache_ipv4,
328                                params.cache_ipv6,
329                            )
330                            .await
331                        {
332                            result
333                        } else {
334                            return output
335                                .with_result(SpfResult::TempError)
336                                .with_report(&spf_record);
337                        }
338                    }
339                };
340
341                if matches {
342                    result = Some((&directive.qualifier).into());
343                    break;
344                }
345            }
346
347            // Follow redirect
348            if let (Some(macro_string), None) = (&spf_record.redirect, &result) {
349                if !lookup_limit.can_lookup() {
350                    return output
351                        .with_result(SpfResult::PermError)
352                        .with_report(&spf_record);
353                }
354
355                let target_name = macro_string.eval(&vars, &domain, true);
356                match self
357                    .txt_lookup::<Spf>(&*target_name, params.cache_txt)
358                    .await
359                {
360                    Ok(redirect_spf) => {
361                        let new_domain = target_name.to_string();
362                        spf_record = redirect_spf;
363                        directives = spf_record.directives.iter().enumerate().skip(0);
364                        domain = new_domain;
365                        vars.set_domain(domain.as_bytes().to_vec());
366                        continue;
367                    }
368                    Err(
369                        Error::DnsRecordNotFound(_) | Error::InvalidRecordType | Error::ParseError,
370                    ) => {
371                        return output
372                            .with_result(SpfResult::PermError)
373                            .with_report(&spf_record);
374                    }
375                    Err(_) => {
376                        return output
377                            .with_result(SpfResult::TempError)
378                            .with_report(&spf_record);
379                    }
380                }
381            }
382
383            if let Some((prev_record, prev_pos, prev_domain)) = include_stack.pop() {
384                spf_record = prev_record;
385                directives = spf_record.directives.iter().enumerate().skip(prev_pos);
386                let (_, directive) = directives.next().unwrap();
387
388                if matches!(result, Some(SpfResult::Pass)) {
389                    result = Some((&directive.qualifier).into());
390                    break;
391                } else {
392                    vars.set_domain(prev_domain.as_bytes().to_vec());
393                    domain = prev_domain;
394                    result = None;
395                }
396            } else {
397                break;
398            }
399        }
400
401        // Evaluate explain
402        if let (Some(macro_string), Some(SpfResult::Fail)) = (&spf_record.exp, &result)
403            && let Ok(macro_string) = self
404                .txt_lookup::<Macro>(
405                    macro_string.eval(&vars, &domain, true).to_string(),
406                    params.cache_txt,
407                )
408                .await
409        {
410            return output
411                .with_result(SpfResult::Fail)
412                .with_explanation(macro_string.eval(&vars, &domain, false).to_string())
413                .with_report(&spf_record);
414        }
415
416        output
417            .with_result(result.unwrap_or(SpfResult::Neutral))
418            .with_report(&spf_record)
419    }
420
421    async fn ip_matches(
422        &self,
423        target_name: &str,
424        ip: IpAddr,
425        ip4_mask: u32,
426        ip6_mask: u128,
427        cache_ipv4: Option<&impl ResolverCache<Box<str>, Arc<[Ipv4Addr]>>>,
428        cache_ipv6: Option<&impl ResolverCache<Box<str>, Arc<[Ipv6Addr]>>>,
429    ) -> crate::Result<bool> {
430        Ok(match ip {
431            IpAddr::V4(ip) => self
432                .ipv4_lookup(target_name, cache_ipv4)
433                .await?
434                .iter()
435                .any(|addr| ip.matches_ipv4_mask(addr, ip4_mask)),
436            IpAddr::V6(ip) => self
437                .ipv6_lookup(target_name, cache_ipv6)
438                .await?
439                .iter()
440                .any(|addr| ip.matches_ipv6_mask(addr, ip6_mask)),
441        })
442    }
443}
444
445impl<'x> SpfParameters<'x> {
446    /// Verifies the SPF EHLO identity
447    pub fn verify_ehlo(
448        ip: IpAddr,
449        helo_domain: &'x str,
450        host_domain: &'x str,
451    ) -> SpfParameters<'x> {
452        SpfParameters {
453            ip,
454            domain: helo_domain,
455            helo_domain,
456            host_domain,
457            sender: Sender::Ehlo(format!("postmaster@{helo_domain}")),
458        }
459    }
460
461    /// Verifies the SPF MAIL FROM identity
462    pub fn verify_mail_from(
463        ip: IpAddr,
464        helo_domain: &'x str,
465        host_domain: &'x str,
466        sender: &'x str,
467    ) -> SpfParameters<'x> {
468        SpfParameters {
469            ip,
470            domain: sender.rsplit_once('@').map_or(helo_domain, |(_, d)| d),
471            helo_domain,
472            host_domain,
473            sender: Sender::MailFrom(sender),
474        }
475    }
476
477    /// Verifies both the SPF EHLO and MAIL FROM identities
478    pub fn verify(
479        ip: IpAddr,
480        helo_domain: &'x str,
481        host_domain: &'x str,
482        sender: &'x str,
483    ) -> SpfParameters<'x> {
484        SpfParameters {
485            ip,
486            domain: sender.rsplit_once('@').map_or(helo_domain, |(_, d)| d),
487            helo_domain,
488            host_domain,
489            sender: Sender::Full(sender),
490        }
491    }
492
493    pub fn new(
494        ip: IpAddr,
495        domain: &'x str,
496        helo_domain: &'x str,
497        host_domain: &'x str,
498        sender: &'x str,
499    ) -> Self {
500        SpfParameters {
501            ip,
502            domain,
503            helo_domain,
504            host_domain,
505            sender: Sender::Full(sender),
506        }
507    }
508}
509
510impl<'x> From<SpfParameters<'x>>
511    for Parameters<
512        'x,
513        SpfParameters<'x>,
514        NoCache<Box<str>, Txt>,
515        NoCache<Box<str>, Arc<[MX]>>,
516        NoCache<Box<str>, Arc<[Ipv4Addr]>>,
517        NoCache<Box<str>, Arc<[Ipv6Addr]>>,
518        NoCache<IpAddr, Arc<[Box<str>]>>,
519    >
520{
521    fn from(params: SpfParameters<'x>) -> Self {
522        Parameters::new(params)
523    }
524}
525
526trait IpMask {
527    fn matches_ipv4_mask(&self, addr: &Ipv4Addr, mask: u32) -> bool;
528    fn matches_ipv6_mask(&self, addr: &Ipv6Addr, mask: u128) -> bool;
529}
530
531impl IpMask for IpAddr {
532    fn matches_ipv4_mask(&self, addr: &Ipv4Addr, mask: u32) -> bool {
533        u32::from_be_bytes(match &self {
534            IpAddr::V4(ip) => ip.octets(),
535            IpAddr::V6(ip) => {
536                if let Some(ip) = ip.to_ipv4_mapped() {
537                    ip.octets()
538                } else {
539                    return false;
540                }
541            }
542        }) & mask
543            == u32::from_be_bytes(addr.octets()) & mask
544    }
545
546    fn matches_ipv6_mask(&self, addr: &Ipv6Addr, mask: u128) -> bool {
547        u128::from_be_bytes(match &self {
548            IpAddr::V6(ip) => ip.octets(),
549            IpAddr::V4(ip) => ip.to_ipv6_mapped().octets(),
550        }) & mask
551            == u128::from_be_bytes(addr.octets()) & mask
552    }
553}
554
555impl IpMask for Ipv6Addr {
556    fn matches_ipv6_mask(&self, addr: &Ipv6Addr, mask: u128) -> bool {
557        u128::from_be_bytes(self.octets()) & mask == u128::from_be_bytes(addr.octets()) & mask
558    }
559
560    fn matches_ipv4_mask(&self, _addr: &Ipv4Addr, _mask: u32) -> bool {
561        unimplemented!()
562    }
563}
564
565impl IpMask for Ipv4Addr {
566    fn matches_ipv4_mask(&self, addr: &Ipv4Addr, mask: u32) -> bool {
567        u32::from_be_bytes(self.octets()) & mask == u32::from_be_bytes(addr.octets()) & mask
568    }
569
570    fn matches_ipv6_mask(&self, _addr: &Ipv6Addr, _mask: u128) -> bool {
571        unimplemented!()
572    }
573}
574
575impl From<&Qualifier> for SpfResult {
576    fn from(q: &Qualifier) -> Self {
577        match q {
578            Qualifier::Pass => SpfResult::Pass,
579            Qualifier::Fail => SpfResult::Fail,
580            Qualifier::SoftFail => SpfResult::SoftFail,
581            Qualifier::Neutral => SpfResult::Neutral,
582        }
583    }
584}
585
586impl From<Error> for SpfResult {
587    fn from(err: Error) -> Self {
588        match err {
589            Error::DnsRecordNotFound(_) | Error::InvalidRecordType => SpfResult::None,
590            Error::ParseError => SpfResult::PermError,
591            _ => SpfResult::TempError,
592        }
593    }
594}
595
596struct LookupLimit {
597    num_lookups: u32,
598    timer: Instant,
599}
600
601impl LookupLimit {
602    pub fn new() -> Self {
603        LookupLimit {
604            num_lookups: 1,
605            timer: Instant::now(),
606        }
607    }
608
609    #[inline(always)]
610    fn can_lookup(&mut self) -> bool {
611        if self.num_lookups <= 10 && self.timer.elapsed().as_secs() < 20 {
612            self.num_lookups += 1;
613            true
614        } else {
615            false
616        }
617    }
618}
619
620pub trait HasValidLabels {
621    fn has_valid_labels(&self) -> bool;
622}
623
624impl HasValidLabels for &str {
625    fn has_valid_labels(&self) -> bool {
626        let mut has_dots = false;
627        let mut has_chars = false;
628        let mut label_len = 0;
629        for ch in self.chars() {
630            label_len += 1;
631
632            if ch.is_alphanumeric() {
633                has_chars = true;
634            } else if ch == '.' {
635                has_dots = true;
636                label_len = 0;
637            }
638
639            if label_len > 63 {
640                return false;
641            }
642        }
643        if has_chars && has_dots {
644            return true;
645        }
646        false
647    }
648}
649
650#[cfg(test)]
651#[allow(unused)]
652mod test {
653
654    use std::{
655        fs,
656        net::{IpAddr, Ipv4Addr, Ipv6Addr},
657        path::PathBuf,
658        time::{Duration, Instant},
659    };
660
661    use crate::{
662        MX, MessageAuthenticator, SpfResult,
663        common::{cache::test::DummyCaches, parse::TxtRecordParser},
664        spf::{Macro, Spf},
665    };
666
667    use super::SpfParameters;
668
669    #[tokio::test]
670    async fn spf_verify() {
671        let resolver = MessageAuthenticator::new_system_conf().unwrap();
672        let valid_until = Instant::now() + Duration::from_secs(30);
673        let mut test_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
674        test_dir.push("resources");
675        test_dir.push("spf");
676
677        for file_name in fs::read_dir(&test_dir).unwrap() {
678            let file_name = file_name.unwrap().path();
679            println!("===== {} =====", file_name.display());
680            let test_suite = String::from_utf8(fs::read(&file_name).unwrap()).unwrap();
681            let caches = DummyCaches::new();
682
683            for test in test_suite.split("---\n") {
684                let mut test_name = "";
685                let mut last_test_name = "";
686                let mut helo = "";
687                let mut mail_from = "";
688                let mut client_ip = "127.0.0.1".parse::<IpAddr>().unwrap();
689                let mut test_num = 1;
690
691                for line in test.split('\n') {
692                    let line = line.trim();
693                    let line = if let Some(line) = line.strip_prefix('-') {
694                        line.trim()
695                    } else {
696                        line
697                    };
698
699                    if let Some(name) = line.strip_prefix("name:") {
700                        test_name = name.trim();
701                    } else if let Some(record) = line.strip_prefix("spf:") {
702                        let (name, record) = record.trim().split_once(' ').unwrap();
703                        caches.txt_add(
704                            name.trim().to_string(),
705                            Spf::parse(record.as_bytes()),
706                            valid_until,
707                        );
708                    } else if let Some(record) = line.strip_prefix("exp:") {
709                        let (name, record) = record.trim().split_once(' ').unwrap();
710                        caches.txt_add(
711                            name.trim().to_string(),
712                            Macro::parse(record.as_bytes()),
713                            valid_until,
714                        );
715                    } else if let Some(record) = line.strip_prefix("a:") {
716                        let (name, record) = record.trim().split_once(' ').unwrap();
717                        caches.ipv4_add(
718                            name.trim().to_string(),
719                            record
720                                .split(',')
721                                .map(|item| item.trim().parse::<Ipv4Addr>().unwrap())
722                                .collect(),
723                            valid_until,
724                        );
725                    } else if let Some(record) = line.strip_prefix("aaaa:") {
726                        let (name, record) = record.trim().split_once(' ').unwrap();
727                        caches.ipv6_add(
728                            name.trim().to_string(),
729                            record
730                                .split(',')
731                                .map(|item| item.trim().parse::<Ipv6Addr>().unwrap())
732                                .collect(),
733                            valid_until,
734                        );
735                    } else if let Some(record) = line.strip_prefix("ptr:") {
736                        let (name, record) = record.trim().split_once(' ').unwrap();
737                        caches.ptr_add(
738                            name.trim().parse::<IpAddr>().unwrap(),
739                            record
740                                .split(',')
741                                .map(|item| Box::from(item.trim()))
742                                .collect(),
743                            valid_until,
744                        );
745                    } else if let Some(record) = line.strip_prefix("mx:") {
746                        let (name, record) = record.trim().split_once(' ').unwrap();
747                        let mut mxs = Vec::new();
748                        for (pos, item) in record.split(',').enumerate() {
749                            let ip = item.trim().parse::<IpAddr>().unwrap();
750                            let mx_name = format!("mx.{ip}.{pos}");
751                            match ip {
752                                IpAddr::V4(ip) => {
753                                    caches.ipv4_add(mx_name.clone(), vec![ip], valid_until)
754                                }
755                                IpAddr::V6(ip) => {
756                                    caches.ipv6_add(mx_name.clone(), vec![ip], valid_until)
757                                }
758                            }
759                            mxs.push(MX {
760                                exchanges: Box::new([mx_name.into_boxed_str()]),
761                                preference: (pos + 1) as u16,
762                            });
763                        }
764                        caches.mx_add(name.trim().to_string(), mxs, valid_until);
765                    } else if let Some(value) = line.strip_prefix("domain:") {
766                        helo = value.trim();
767                    } else if let Some(value) = line.strip_prefix("sender:") {
768                        mail_from = value.trim();
769                    } else if let Some(value) = line.strip_prefix("ip:") {
770                        client_ip = value.trim().parse().unwrap();
771                    } else if let Some(value) = line.strip_prefix("expect:") {
772                        let value = value.trim();
773                        let (result, exp): (SpfResult, &str) =
774                            if let Some((result, exp)) = value.split_once(' ') {
775                                (result.trim().try_into().unwrap(), exp.trim())
776                            } else {
777                                (value.try_into().unwrap(), "")
778                            };
779                        let output = resolver
780                            .verify_spf(caches.parameters(SpfParameters::verify(
781                                client_ip,
782                                helo,
783                                "localdomain.org",
784                                mail_from,
785                            )))
786                            .await;
787                        assert_eq!(
788                            output.result(),
789                            result,
790                            "Failed for {test_name:?}, test {test_num}, ehlo: {helo}, mail-from: {mail_from}.",
791                        );
792
793                        if !exp.is_empty() {
794                            assert_eq!(Some(exp.to_string()).as_deref(), output.explanation());
795                        }
796                        test_num += 1;
797                        if test_name != last_test_name {
798                            println!("Passed test {test_name:?}");
799                            last_test_name = test_name;
800                        }
801                    }
802                }
803            }
804        }
805    }
806}
mail_auth/spf/verify.rs

mail_auth/spf/
verify.rs
