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Diffstat (limited to 'secure/lib/libcrypto/man/X509_STORE_CTX_set_verify_cb.3')
| -rw-r--r-- | secure/lib/libcrypto/man/X509_STORE_CTX_set_verify_cb.3 | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/X509_STORE_CTX_set_verify_cb.3 b/secure/lib/libcrypto/man/X509_STORE_CTX_set_verify_cb.3 new file mode 100644 index 0000000..41c674c --- /dev/null +++ b/secure/lib/libcrypto/man/X509_STORE_CTX_set_verify_cb.3 @@ -0,0 +1,289 @@ +.\" Automatically generated by Pod::Man 2.23 (Pod::Simple 3.22) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +X509_STORE_CTX_set_verify_cb \- set verification callback +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/x509_vfy.h> +\& +\& void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx, +\& int (*verify_cb)(int ok, X509_STORE_CTX *ctx)); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIX509_STORE_CTX_set_verify_cb()\fR sets the verification callback of \fBctx\fR to +\&\fBverify_cb\fR overwriting any existing callback. +.PP +The verification callback can be used to customise the operation of certificate +verification, either by overriding error conditions or logging errors for +debugging purposes. +.PP +However a verification callback is \fBnot\fR essential and the default operation +is often sufficient. +.PP +The \fBok\fR parameter to the callback indicates the value the callback should +return to retain the default behaviour. If it is zero then and error condition +is indicated. If it is 1 then no error occurred. If the flag +\&\fBX509_V_FLAG_NOTIFY_POLICY\fR is set then \fBok\fR is set to 2 to indicate the +policy checking is complete. +.PP +The \fBctx\fR parameter to the callback is the \fBX509_STORE_CTX\fR structure that +is performing the verification operation. A callback can examine this +structure and receive additional information about the error, for example +by calling \fIX509_STORE_CTX_get_current_cert()\fR. Additional application data can +be passed to the callback via the \fBex_data\fR mechanism. +.SH "WARNING" +.IX Header "WARNING" +In general a verification callback should \fB\s-1NOT\s0\fR unconditionally return 1 in +all circumstances because this will allow verification to succeed no matter +what the error. This effectively removes all security from the application +because \fBany\fR certificate (including untrusted generated ones) will be +accepted. +.SH "NOTES" +.IX Header "NOTES" +The verification callback can be set and inherited from the parent structure +performing the operation. In some cases (such as S/MIME verification) the +\&\fBX509_STORE_CTX\fR structure is created and destroyed internally and the +only way to set a custom verification callback is by inheriting it from the +associated \fBX509_STORE\fR. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIX509_STORE_CTX_set_verify_cb()\fR does not return a value. +.SH "EXAMPLES" +.IX Header "EXAMPLES" +Default callback operation: +.PP +.Vb 4 +\& int verify_callback(int ok, X509_STORE_CTX *ctx) +\& { +\& return ok; +\& } +.Ve +.PP +Simple example, suppose a certificate in the chain is expired and we wish +to continue after this error: +.PP +.Vb 8 +\& int verify_callback(int ok, X509_STORE_CTX *ctx) +\& { +\& /* Tolerate certificate expiration */ +\& if (X509_STORE_CTX_get_error(ctx) == X509_V_ERR_CERT_HAS_EXPIRED) +\& return 1; +\& /* Otherwise don\*(Aqt override */ +\& return ok; +\& } +.Ve +.PP +More complex example, we don't wish to continue after \fBany\fR certificate has +expired just one specific case: +.PP +.Vb 11 +\& int verify_callback(int ok, X509_STORE_CTX *ctx) +\& { +\& int err = X509_STORE_CTX_get_error(ctx); +\& X509 *err_cert = X509_STORE_CTX_get_current_cert(ctx); +\& if (err == X509_V_ERR_CERT_HAS_EXPIRED) +\& { +\& if (check_is_acceptable_expired_cert(err_cert) +\& return 1; +\& } +\& return ok; +\& } +.Ve +.PP +Full featured logging callback. In this case the \fBbio_err\fR is assumed to be +a global logging \fB\s-1BIO\s0\fR, an alternative would to store a \s-1BIO\s0 in \fBctx\fR using +\&\fBex_data\fR. +.PP +.Vb 4 +\& int verify_callback(int ok, X509_STORE_CTX *ctx) +\& { +\& X509 *err_cert; +\& int err,depth; +\& +\& err_cert = X509_STORE_CTX_get_current_cert(ctx); +\& err = X509_STORE_CTX_get_error(ctx); +\& depth = X509_STORE_CTX_get_error_depth(ctx); +\& +\& BIO_printf(bio_err,"depth=%d ",depth); +\& if (err_cert) +\& { +\& X509_NAME_print_ex(bio_err, X509_get_subject_name(err_cert), +\& 0, XN_FLAG_ONELINE); +\& BIO_puts(bio_err, "\en"); +\& } +\& else +\& BIO_puts(bio_err, "<no cert>\en"); +\& if (!ok) +\& BIO_printf(bio_err,"verify error:num=%d:%s\en",err, +\& X509_verify_cert_error_string(err)); +\& switch (err) +\& { +\& case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: +\& BIO_puts(bio_err,"issuer= "); +\& X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert), +\& 0, XN_FLAG_ONELINE); +\& BIO_puts(bio_err, "\en"); +\& break; +\& case X509_V_ERR_CERT_NOT_YET_VALID: +\& case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: +\& BIO_printf(bio_err,"notBefore="); +\& ASN1_TIME_print(bio_err,X509_get_notBefore(err_cert)); +\& BIO_printf(bio_err,"\en"); +\& break; +\& case X509_V_ERR_CERT_HAS_EXPIRED: +\& case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: +\& BIO_printf(bio_err,"notAfter="); +\& ASN1_TIME_print(bio_err,X509_get_notAfter(err_cert)); +\& BIO_printf(bio_err,"\en"); +\& break; +\& case X509_V_ERR_NO_EXPLICIT_POLICY: +\& policies_print(bio_err, ctx); +\& break; +\& } +\& if (err == X509_V_OK && ok == 2) +\& /* print out policies */ +\& +\& BIO_printf(bio_err,"verify return:%d\en",ok); +\& return(ok); +\& } +.Ve +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIX509_STORE_CTX_get_error\fR\|(3) +\&\fIX509_STORE_set_verify_cb_func\fR\|(3) +\&\fIX509_STORE_CTX_get_ex_new_index\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIX509_STORE_CTX_set_verify_cb()\fR is available in all versions of SSLeay and +OpenSSL. |
