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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 JH |
7 | License: GPL |
8 | Copyright (c) The Exim Maintainers 2016 | |
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[] = { | |
18 | { US"invalid", 0}, | |
19 | { US"neutral", 1 }, | |
20 | { US"pass", 2 }, | |
21 | { US"fail", 3 }, | |
22 | { US"softfail", 4 }, | |
23 | { US"none", 5 }, | |
982650ec TL |
24 | { US"err_temp", 6 }, /* Deprecated Apr 2014 */ |
25 | { US"err_perm", 7 }, /* Deprecated Apr 2014 */ | |
26 | { US"temperror", 6 }, /* RFC 4408 defined */ | |
27 | { US"permerror", 7 } /* RFC 4408 defined */ | |
6d06cf48 TK |
28 | }; |
29 | ||
384152a6 TK |
30 | SPF_server_t *spf_server = NULL; |
31 | SPF_request_t *spf_request = NULL; | |
32 | SPF_response_t *spf_response = NULL; | |
33 | SPF_response_t *spf_response_2mx = NULL; | |
8523533c TK |
34 | |
35 | /* spf_init sets up a context that can be re-used for several | |
36 | messages on the same SMTP connection (that come from the | |
37 | same host with the same HELO string) */ | |
8e669ac1 | 38 | |
8523533c | 39 | int spf_init(uschar *spf_helo_domain, uschar *spf_remote_addr) { |
8e669ac1 | 40 | |
92f1b170 | 41 | spf_server = SPF_server_new(SPF_DNS_CACHE, 0); |
8e669ac1 | 42 | |
384152a6 TK |
43 | if ( spf_server == NULL ) { |
44 | debug_printf("spf: SPF_server_new() failed.\n"); | |
45 | return 0; | |
8523533c TK |
46 | } |
47 | ||
7156b1ef | 48 | if (SPF_server_set_rec_dom(spf_server, CS primary_hostname)) { |
6f7fe114 | 49 | debug_printf("spf: SPF_server_set_rec_dom(\"%s\") failed.\n", primary_hostname); |
7b3a77e5 TK |
50 | spf_server = NULL; |
51 | return 0; | |
52 | } | |
53 | ||
384152a6 | 54 | spf_request = SPF_request_new(spf_server); |
8523533c | 55 | |
6f7fe114 PP |
56 | if (SPF_request_set_ipv4_str(spf_request, CS spf_remote_addr) |
57 | && SPF_request_set_ipv6_str(spf_request, CS spf_remote_addr)) { | |
58 | debug_printf("spf: SPF_request_set_ipv4_str() and SPF_request_set_ipv6_str() failed [%s]\n", spf_remote_addr); | |
384152a6 TK |
59 | spf_server = NULL; |
60 | spf_request = NULL; | |
61 | return 0; | |
8523533c TK |
62 | } |
63 | ||
7156b1ef | 64 | if (SPF_request_set_helo_dom(spf_request, CS spf_helo_domain)) { |
6f7fe114 | 65 | debug_printf("spf: SPF_set_helo_dom(\"%s\") failed.\n", spf_helo_domain); |
384152a6 TK |
66 | spf_server = NULL; |
67 | spf_request = NULL; | |
68 | return 0; | |
8523533c | 69 | } |
8e669ac1 | 70 | |
8523533c TK |
71 | return 1; |
72 | } | |
73 | ||
74 | ||
75 | /* spf_process adds the envelope sender address to the existing | |
76 | context (if any), retrieves the result, sets up expansion | |
77 | strings and evaluates the condition outcome. */ | |
78 | ||
eac732ad | 79 | int spf_process(const uschar **listptr, uschar *spf_envelope_sender, int action) { |
8523533c | 80 | int sep = 0; |
eac732ad | 81 | const uschar *list = *listptr; |
8523533c TK |
82 | uschar *spf_result_id; |
83 | uschar spf_result_id_buffer[128]; | |
384152a6 | 84 | int rc = SPF_RESULT_PERMERROR; |
8e669ac1 | 85 | |
384152a6 | 86 | if (!(spf_server && spf_request)) { |
8523533c | 87 | /* no global context, assume temp error and skip to evaluation */ |
384152a6 | 88 | rc = SPF_RESULT_PERMERROR; |
8523533c TK |
89 | goto SPF_EVALUATE; |
90 | }; | |
91 | ||
7156b1ef | 92 | if (SPF_request_set_env_from(spf_request, CS spf_envelope_sender)) { |
8523533c | 93 | /* Invalid sender address. This should be a real rare occurence */ |
384152a6 | 94 | rc = SPF_RESULT_PERMERROR; |
8523533c | 95 | goto SPF_EVALUATE; |
8e669ac1 | 96 | } |
8523533c TK |
97 | |
98 | /* get SPF result */ | |
65a7d8c3 | 99 | if (action == SPF_PROCESS_FALLBACK) |
7156b1ef | 100 | SPF_request_query_fallback(spf_request, &spf_response, CS spf_guess); |
65a7d8c3 NM |
101 | else |
102 | SPF_request_query_mailfrom(spf_request, &spf_response); | |
8523533c TK |
103 | |
104 | /* set up expansion items */ | |
384152a6 TK |
105 | spf_header_comment = (uschar *)SPF_response_get_header_comment(spf_response); |
106 | spf_received = (uschar *)SPF_response_get_received_spf(spf_response); | |
107 | spf_result = (uschar *)SPF_strresult(SPF_response_result(spf_response)); | |
108 | spf_smtp_comment = (uschar *)SPF_response_get_smtp_comment(spf_response); | |
8523533c | 109 | |
384152a6 | 110 | rc = SPF_response_result(spf_response); |
8523533c TK |
111 | |
112 | /* We got a result. Now see if we should return OK or FAIL for it */ | |
113 | SPF_EVALUATE: | |
114 | debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc), rc); | |
65a7d8c3 NM |
115 | |
116 | if (action == SPF_PROCESS_GUESS && (!strcmp (SPF_strresult(rc), "none"))) | |
117 | return spf_process(listptr, spf_envelope_sender, SPF_PROCESS_FALLBACK); | |
118 | ||
8523533c TK |
119 | while ((spf_result_id = string_nextinlist(&list, &sep, |
120 | spf_result_id_buffer, | |
121 | sizeof(spf_result_id_buffer))) != NULL) { | |
122 | int negate = 0; | |
123 | int result = 0; | |
124 | ||
125 | /* Check for negation */ | |
126 | if (spf_result_id[0] == '!') { | |
127 | negate = 1; | |
128 | spf_result_id++; | |
129 | }; | |
130 | ||
131 | /* Check the result identifier */ | |
132 | result = Ustrcmp(spf_result_id, spf_result_id_list[rc].name); | |
133 | if (!negate && result==0) return OK; | |
134 | if (negate && result!=0) return OK; | |
135 | }; | |
136 | ||
137 | /* no match */ | |
138 | return FAIL; | |
139 | } | |
140 | ||
141 | #endif |