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#include "mupdf/fitz.h"
#include "mupdf/pdf.h"
#include "mupdf/helpers/pkcs7-openssl.h"
#include "mupdf/helpers/pkcs7-check.h"
#include <string.h>
static void pdf_print_designated_name(pdf_pkcs7_designated_name *name, char *buf, int buflen)
{
int i, n;
const char *part[] = {
"/CN=", name->cn,
"/O=", name->o,
"/OU=", name->ou,
"/emailAddress=", name->email,
"/C=", name->c};
if (buflen)
buf[0] = 0;
n = sizeof(part)/sizeof(*part);
for (i = 0; i < n; i++)
if (part[i])
fz_strlcat(buf, part[i], buflen);
}
int pdf_check_signature(fz_context *ctx, pdf_document *doc, pdf_widget *widget, char *ebuf, int ebufsize)
{
fz_stream *bytes = NULL;
char *contents = NULL;
int contents_len;
int res = 0;
if (pdf_xref_obj_is_unsaved_signature(doc, ((pdf_annot *)widget)->obj))
{
fz_strlcpy(ebuf, "Signed but document yet to be saved", ebufsize);
if (ebufsize > 0)
ebuf[ebufsize-1] = 0;
return 0;
}
fz_var(bytes);
fz_var(res);
fz_try(ctx)
{
contents_len = pdf_signature_widget_contents(ctx, doc, widget, &contents);
if (contents)
{
SignatureError err;
bytes = pdf_signature_widget_hash_bytes(ctx, doc, widget);
err = pkcs7_openssl_check_digest(ctx, bytes, contents, contents_len);
if (err == SignatureError_Okay)
err = pkcs7_openssl_check_certificate(contents, contents_len);
switch (err)
{
case SignatureError_Okay:
ebuf[0] = 0;
res = 1;
break;
case SignatureError_NoSignatures:
fz_strlcpy(ebuf, "No signatures", ebufsize);
break;
case SignatureError_NoCertificate:
fz_strlcpy(ebuf, "No certificate", ebufsize);
break;
case SignatureError_DocumentChanged:
fz_strlcpy(ebuf, "Document changed since signing", ebufsize);
break;
case SignatureError_SelfSigned:
fz_strlcpy(ebuf, "Self-signed certificate", ebufsize);
break;
case SignatureError_SelfSignedInChain:
fz_strlcpy(ebuf, "Self-signed certificate in chain", ebufsize);
break;
case SignatureError_NotTrusted:
fz_strlcpy(ebuf, "Certificate not trusted", ebufsize);
break;
default:
case SignatureError_Unknown:
fz_strlcpy(ebuf, "Unknown error", ebufsize);
break;
}
switch (err)
{
case SignatureError_SelfSigned:
case SignatureError_SelfSignedInChain:
case SignatureError_NotTrusted:
{
pdf_pkcs7_designated_name *name = pkcs7_openssl_designated_name(ctx, contents, contents_len);
if (name)
{
int len;
fz_strlcat(ebuf, ": ", ebufsize);
len = strlen(ebuf);
pdf_print_designated_name(name, ebuf + len, ebufsize - len);
pkcs7_opensll_drop_designated_name(ctx, name);
}
}
break;
default:
break;
}
}
else
{
res = 0;
fz_strlcpy(ebuf, "Not signed", ebufsize);
}
}
fz_always(ctx)
{
fz_drop_stream(ctx, bytes);
}
fz_catch(ctx)
{
res = 0;
fz_strlcpy(ebuf, fz_caught_message(ctx), ebufsize);
}
if (ebufsize > 0)
ebuf[ebufsize-1] = 0;
return res;
}
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