cb.c revision 296465 
1#include "tunala.h"
2
3#ifndef NO_OPENSSL
4
5/* For callbacks generating output, here are their file-descriptors. */
6static FILE *fp_cb_ssl_info = NULL;
7static FILE *fp_cb_ssl_verify = NULL;
8/*-
9 * Output level:
10 *     0 = nothing,
11 *     1 = minimal, just errors,
12 *     2 = minimal, all steps,
13 *     3 = detail, all steps */
14static unsigned int cb_ssl_verify_level = 1;
15
16/* Other static rubbish (to mirror s_cb.c where required) */
17static int int_verify_depth = 10;
18
19/*
20 * This function is largely borrowed from the one used in OpenSSL's
21 * "s_client" and "s_server" utilities.
22 */
23void cb_ssl_info(const SSL *s, int where, int ret)
24{
25    const char *str1, *str2;
26    int w;
27
28    if (!fp_cb_ssl_info)
29        return;
30
31    w = where & ~SSL_ST_MASK;
32    str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
33                                                  "SSL_accept" :
34                                                  "undefined")), str2 =
35        SSL_state_string_long(s);
36
37    if (where & SSL_CB_LOOP)
38        fprintf(fp_cb_ssl_info, "(%s) %s\n", str1, str2);
39    else if (where & SSL_CB_EXIT) {
40        if (ret == 0)
41            fprintf(fp_cb_ssl_info, "(%s) failed in %s\n", str1, str2);
42        /*
43         * In a non-blocking model, we get a few of these "error"s simply
44         * because we're calling "reads" and "writes" on the state-machine
45         * that are virtual NOPs simply to avoid wasting the time seeing if
46         * we *should* call them. Removing this case makes the "-out_state"
47         * output a lot easier on the eye.
48         */
49# if 0
50        else if (ret < 0)
51            fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
52# endif
53    }
54}
55
56void cb_ssl_info_set_output(FILE *fp)
57{
58    fp_cb_ssl_info = fp;
59}
60
61static const char *int_reason_no_issuer =
62    "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT";
63static const char *int_reason_not_yet = "X509_V_ERR_CERT_NOT_YET_VALID";
64static const char *int_reason_before =
65    "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD";
66static const char *int_reason_expired = "X509_V_ERR_CERT_HAS_EXPIRED";
67static const char *int_reason_after =
68    "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD";
69
70/* Stolen wholesale from apps/s_cb.c :-) And since then, mutilated ... */
71int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
72{
73    char buf1[256];             /* Used for the subject name */
74    char buf2[256];             /* Used for the issuer name */
75    const char *reason = NULL;  /* Error reason (if any) */
76    X509 *err_cert;
77    int err, depth;
78
79    if (!fp_cb_ssl_verify || (cb_ssl_verify_level == 0))
80        return ok;
81    err_cert = X509_STORE_CTX_get_current_cert(ctx);
82    err = X509_STORE_CTX_get_error(ctx);
83    depth = X509_STORE_CTX_get_error_depth(ctx);
84
85    buf1[0] = buf2[0] = '\0';
86    /* Fill buf1 */
87    X509_NAME_oneline(X509_get_subject_name(err_cert), buf1, 256);
88    /* Fill buf2 */
89    X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf2, 256);
90    switch (ctx->error) {
91    case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
92        reason = int_reason_no_issuer;
93        break;
94    case X509_V_ERR_CERT_NOT_YET_VALID:
95        reason = int_reason_not_yet;
96        break;
97    case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
98        reason = int_reason_before;
99        break;
100    case X509_V_ERR_CERT_HAS_EXPIRED:
101        reason = int_reason_expired;
102        break;
103    case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
104        reason = int_reason_after;
105        break;
106    }
107
108    if ((cb_ssl_verify_level == 1) && ok)
109        return ok;
110    fprintf(fp_cb_ssl_verify, "chain-depth=%d, ", depth);
111    if (reason)
112        fprintf(fp_cb_ssl_verify, "error=%s\n", reason);
113    else
114        fprintf(fp_cb_ssl_verify, "error=%d\n", err);
115    if (cb_ssl_verify_level < 3)
116        return ok;
117    fprintf(fp_cb_ssl_verify, "--> subject = %s\n", buf1);
118    fprintf(fp_cb_ssl_verify, "--> issuer  = %s\n", buf2);
119    if (!ok)
120        fprintf(fp_cb_ssl_verify, "--> verify error:num=%d:%s\n", err,
121                X509_verify_cert_error_string(err));
122    fprintf(fp_cb_ssl_verify, "--> verify return:%d\n", ok);
123    return ok;
124}
125
126void cb_ssl_verify_set_output(FILE *fp)
127{
128    fp_cb_ssl_verify = fp;
129}
130
131void cb_ssl_verify_set_depth(unsigned int verify_depth)
132{
133    int_verify_depth = verify_depth;
134}
135
136void cb_ssl_verify_set_level(unsigned int level)
137{
138    if (level < 4)
139        cb_ssl_verify_level = level;
140}
141
142RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength)
143{
144    /*
145     * TODO: Perhaps make it so our global key can be generated on-the-fly
146     * after certain intervals?
147     */
148    static RSA *rsa_tmp = NULL;
149    if (!rsa_tmp)
150        rsa_tmp = RSA_generate_key(keylength, RSA_F4, NULL, NULL);
151    return rsa_tmp;
152}
153
154#endif                          /* !defined(NO_OPENSSL) */
155