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8523533c TK |
1 | /* $Cambridge: exim/src/src/spf.c,v 1.2 2004/12/16 15:11:47 tom Exp $ */ |
2 | ||
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Experimental SPF support. | |
8 | Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 | |
9 | License: GPL */ | |
10 | ||
11 | /* Code for calling spf checks via libspf-alt. Called from acl.c. */ | |
12 | ||
13 | #include "exim.h" | |
14 | #ifdef EXPERIMENTAL_SPF | |
15 | ||
16 | /* #include "spf.h" */ | |
17 | ||
18 | SPF_config_t spfcid = NULL; | |
19 | SPF_dns_config_t spfdcid_resolv = NULL; | |
20 | SPF_dns_config_t spfdcid = NULL; | |
21 | ||
22 | ||
23 | /* spf_init sets up a context that can be re-used for several | |
24 | messages on the same SMTP connection (that come from the | |
25 | same host with the same HELO string) */ | |
26 | ||
27 | int spf_init(uschar *spf_helo_domain, uschar *spf_remote_addr) { | |
28 | uschar *p; | |
29 | ||
30 | /* paranoia */ | |
31 | spfcid = NULL; | |
32 | spfdcid_resolv = NULL; | |
33 | spfdcid = NULL; | |
34 | ||
35 | spfcid = SPF_create_config(); | |
36 | if ( spfcid == NULL ) { | |
37 | debug_printf("spf: SPF_create_config() failed.\n"); | |
38 | return 0; | |
39 | } | |
40 | ||
41 | /* set up resolver */ | |
42 | spfdcid_resolv = SPF_dns_create_config_resolv(NULL, 0); | |
43 | spfdcid = SPF_dns_create_config_cache(spfdcid_resolv, 8, 0); | |
44 | ||
45 | if (spfdcid == NULL) { | |
46 | debug_printf("spf: SPF_dns_create_config_cache() failed.\n"); | |
47 | spfcid = NULL; | |
48 | spfdcid_resolv = NULL; | |
49 | return 0; | |
50 | } | |
51 | ||
52 | if (SPF_set_ip_str(spfcid, spf_remote_addr)) { | |
53 | debug_printf("spf: SPF_set_ip_str() failed.\n"); | |
54 | spfcid = NULL; | |
55 | spfdcid_resolv = NULL; | |
56 | return 0; | |
57 | } | |
58 | ||
59 | if (SPF_set_helo_dom(spfcid, spf_helo_domain)) { | |
60 | debug_printf("spf: SPF_set_helo_dom() failed.\n"); | |
61 | spfcid = NULL; | |
62 | spfdcid_resolv = NULL; | |
63 | return 0; | |
64 | } | |
65 | ||
66 | return 1; | |
67 | } | |
68 | ||
69 | ||
70 | /* spf_process adds the envelope sender address to the existing | |
71 | context (if any), retrieves the result, sets up expansion | |
72 | strings and evaluates the condition outcome. */ | |
73 | ||
74 | int spf_process(uschar **listptr, uschar *spf_envelope_sender) { | |
75 | int sep = 0; | |
76 | uschar *list = *listptr; | |
77 | uschar *spf_result_id; | |
78 | uschar spf_result_id_buffer[128]; | |
79 | SPF_output_t spf_output; | |
80 | int rc = SPF_RESULT_ERROR; | |
81 | ||
82 | if (!(spfcid && spfdcid)) { | |
83 | /* no global context, assume temp error and skip to evaluation */ | |
84 | rc = SPF_RESULT_ERROR; | |
85 | goto SPF_EVALUATE; | |
86 | }; | |
87 | ||
88 | if (SPF_set_env_from(spfcid, spf_envelope_sender)) { | |
89 | /* Invalid sender address. This should be a real rare occurence */ | |
90 | rc = SPF_RESULT_ERROR; | |
91 | goto SPF_EVALUATE; | |
92 | } | |
93 | ||
94 | /* get SPF result */ | |
95 | spf_output = SPF_result(spfcid, spfdcid); | |
96 | ||
97 | /* set up expansion items */ | |
98 | spf_header_comment = spf_output.header_comment ? (uschar *)spf_output.header_comment : NULL; | |
99 | spf_received = spf_output.received_spf ? (uschar *)spf_output.received_spf : NULL; | |
100 | spf_result = (uschar *)SPF_strresult(spf_output.result); | |
101 | spf_smtp_comment = spf_output.smtp_comment ? (uschar *)spf_output.smtp_comment : NULL; | |
102 | ||
103 | rc = spf_output.result; | |
104 | ||
105 | /* We got a result. Now see if we should return OK or FAIL for it */ | |
106 | SPF_EVALUATE: | |
107 | debug_printf("SPF result is %s (%d)\n", SPF_strresult(rc), rc); | |
108 | while ((spf_result_id = string_nextinlist(&list, &sep, | |
109 | spf_result_id_buffer, | |
110 | sizeof(spf_result_id_buffer))) != NULL) { | |
111 | int negate = 0; | |
112 | int result = 0; | |
113 | ||
114 | /* Check for negation */ | |
115 | if (spf_result_id[0] == '!') { | |
116 | negate = 1; | |
117 | spf_result_id++; | |
118 | }; | |
119 | ||
120 | /* Check the result identifier */ | |
121 | result = Ustrcmp(spf_result_id, spf_result_id_list[rc].name); | |
122 | if (!negate && result==0) return OK; | |
123 | if (negate && result!=0) return OK; | |
124 | }; | |
125 | ||
126 | /* no match */ | |
127 | return FAIL; | |
128 | } | |
129 | ||
130 | #endif | |
131 |