Commit | Line | Data |
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8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
8e669ac1 | 4 | |
8523533c | 5 | /* Experimental SPF support. |
5a66c31b | 6 | Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 - 2014 |
80fea873 | 7 | License: GPL |
9242a7e8 | 8 | Copyright (c) The Exim Maintainers 2017 |
80fea873 | 9 | */ |
8e669ac1 | 10 | |
8523533c TK |
11 | /* Code for calling spf checks via libspf-alt. Called from acl.c. */ |
12 | ||
13 | #include "exim.h" | |
14 | #ifdef EXPERIMENTAL_SPF | |
15 | ||
6d06cf48 TK |
16 | /* must be kept in numeric order */ |
17 | static spf_result_id spf_result_id_list[] = { | |
f2ed27cf JH |
18 | /* name value */ |
19 | { US"invalid", 0}, | |
20 | { US"neutral", 1 }, | |
21 | { US"pass", 2 }, | |
22 | { US"fail", 3 }, | |
23 | { US"softfail", 4 }, | |
24 | { US"none", 5 }, | |
25 | { US"err_temp", 6 }, /* Deprecated Apr 2014 */ | |
26 | { US"err_perm", 7 }, /* Deprecated Apr 2014 */ | |
27 | { US"temperror", 6 }, /* RFC 4408 defined */ | |
28 | { US"permerror", 7 } /* RFC 4408 defined */ | |
6d06cf48 TK |
29 | }; |
30 | ||
384152a6 TK |
31 | SPF_server_t *spf_server = NULL; |
32 | SPF_request_t *spf_request = NULL; | |
33 | SPF_response_t *spf_response = NULL; | |
34 | SPF_response_t *spf_response_2mx = NULL; | |
8523533c TK |
35 | |
36 | /* spf_init sets up a context that can be re-used for several | |
37 | messages on the same SMTP connection (that come from the | |
38 | same host with the same HELO string) */ | |
8e669ac1 | 39 | |
8523533c | 40 | int spf_init(uschar *spf_helo_domain, uschar *spf_remote_addr) { |
8e669ac1 | 41 | |
92f1b170 | 42 | spf_server = SPF_server_new(SPF_DNS_CACHE, 0); |
8e669ac1 | 43 | |
384152a6 TK |
44 | if ( spf_server == NULL ) { |
45 | debug_printf("spf: SPF_server_new() failed.\n"); | |
46 | return 0; | |
8523533c TK |
47 | } |
48 | ||
7156b1ef | 49 | if (SPF_server_set_rec_dom(spf_server, CS primary_hostname)) { |
6f7fe114 | 50 | debug_printf("spf: SPF_server_set_rec_dom(\"%s\") failed.\n", primary_hostname); |
7b3a77e5 TK |
51 | spf_server = NULL; |
52 | return 0; | |
53 | } | |
54 | ||
384152a6 | 55 | spf_request = SPF_request_new(spf_server); |
8523533c | 56 | |
6f7fe114 PP |
57 | if (SPF_request_set_ipv4_str(spf_request, CS spf_remote_addr) |
58 | && SPF_request_set_ipv6_str(spf_request, CS spf_remote_addr)) { | |
59 | debug_printf("spf: SPF_request_set_ipv4_str() and SPF_request_set_ipv6_str() failed [%s]\n", spf_remote_addr); | |
384152a6 TK |
60 | spf_server = NULL; |
61 | spf_request = NULL; | |
62 | return 0; | |
8523533c TK |
63 | } |
64 | ||
7156b1ef | 65 | if (SPF_request_set_helo_dom(spf_request, CS spf_helo_domain)) { |
6f7fe114 | 66 | debug_printf("spf: SPF_set_helo_dom(\"%s\") failed.\n", spf_helo_domain); |
384152a6 TK |
67 | spf_server = NULL; |
68 | spf_request = NULL; | |
69 | return 0; | |
8523533c | 70 | } |
8e669ac1 | 71 | |
8523533c TK |
72 | return 1; |
73 | } | |
74 | ||
75 | ||
76 | /* spf_process adds the envelope sender address to the existing | |
77 | context (if any), retrieves the result, sets up expansion | |
78 | strings and evaluates the condition outcome. */ | |
79 | ||
eac732ad | 80 | int spf_process(const uschar **listptr, uschar *spf_envelope_sender, int action) { |
8523533c | 81 | int sep = 0; |
eac732ad | 82 | const uschar *list = *listptr; |
8523533c TK |
83 | uschar *spf_result_id; |
84 | uschar spf_result_id_buffer[128]; | |
384152a6 | 85 | int rc = SPF_RESULT_PERMERROR; |
8e669ac1 | 86 | |
384152a6 | 87 | if (!(spf_server && spf_request)) { |
8523533c | 88 | /* no global context, assume temp error and skip to evaluation */ |
384152a6 | 89 | rc = SPF_RESULT_PERMERROR; |
8523533c TK |
90 | goto SPF_EVALUATE; |
91 | }; | |
92 | ||
7156b1ef | 93 | if (SPF_request_set_env_from(spf_request, CS spf_envelope_sender)) { |
8523533c | 94 | /* Invalid sender address. This should be a real rare occurence */ |
384152a6 | 95 | rc = SPF_RESULT_PERMERROR; |
8523533c | 96 | goto SPF_EVALUATE; |
8e669ac1 | 97 | } |
8523533c TK |
98 | |
99 | /* get SPF result */ | |
65a7d8c3 | 100 | if (action == SPF_PROCESS_FALLBACK) |
7156b1ef | 101 | SPF_request_query_fallback(spf_request, &spf_response, CS spf_guess); |
65a7d8c3 NM |
102 | else |
103 | SPF_request_query_mailfrom(spf_request, &spf_response); | |
8523533c TK |
104 | |
105 | /* set up expansion items */ | |
5903c6ff JH |
106 | spf_header_comment = US SPF_response_get_header_comment(spf_response); |
107 | spf_received = US SPF_response_get_received_spf(spf_response); | |
108 | spf_result = US SPF_strresult(SPF_response_result(spf_response)); | |
109 | spf_smtp_comment = US SPF_response_get_smtp_comment(spf_response); | |
8523533c | 110 | |
384152a6 | 111 | rc = SPF_response_result(spf_response); |
8523533c TK |
112 | |
113 | /* We got a result. Now see if we should return OK or FAIL for it */ | |
114 | SPF_EVALUATE: | |
115 | debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc), rc); | |
65a7d8c3 NM |
116 | |
117 | if (action == SPF_PROCESS_GUESS && (!strcmp (SPF_strresult(rc), "none"))) | |
118 | return spf_process(listptr, spf_envelope_sender, SPF_PROCESS_FALLBACK); | |
119 | ||
8523533c TK |
120 | while ((spf_result_id = string_nextinlist(&list, &sep, |
121 | spf_result_id_buffer, | |
122 | sizeof(spf_result_id_buffer))) != NULL) { | |
123 | int negate = 0; | |
124 | int result = 0; | |
125 | ||
126 | /* Check for negation */ | |
127 | if (spf_result_id[0] == '!') { | |
128 | negate = 1; | |
129 | spf_result_id++; | |
130 | }; | |
131 | ||
132 | /* Check the result identifier */ | |
133 | result = Ustrcmp(spf_result_id, spf_result_id_list[rc].name); | |
134 | if (!negate && result==0) return OK; | |
135 | if (negate && result!=0) return OK; | |
136 | }; | |
137 | ||
138 | /* no match */ | |
139 | return FAIL; | |
140 | } | |
141 | ||
142 | #endif |