summaryrefslogtreecommitdiff
path: root/pith/smime.c
diff options
context:
space:
mode:
Diffstat (limited to 'pith/smime.c')
-rw-r--r--pith/smime.c117
1 files changed, 61 insertions, 56 deletions
diff --git a/pith/smime.c b/pith/smime.c
index 8d7bbd27..9d588479 100644
--- a/pith/smime.c
+++ b/pith/smime.c
@@ -4,6 +4,7 @@ static char rcsid[] = "$Id: smime.c 1176 2008-09-29 21:16:42Z hubert@u.washingto
/*
* ========================================================================
+ * Copyright 2013-2014 Eduardo Chappa
* Copyright 2008 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
@@ -55,7 +56,7 @@ static void openssl_extra_randomness(void);
static int app_RAND_write_file(const char *file);
static void smime_init(void);
static const char *openssl_error_string(void);
-static void create_local_cache(char *base, BODY *b);
+static void create_local_cache(char *h, char *base, BODY *b);
static long rfc822_output_func(void *b, char *string);
static int load_private_key(PERSONAL_CERT *pcert);
static void setup_pkcs7_body_for_signature(BODY *b, char *description,
@@ -64,7 +65,7 @@ static BIO *body_to_bio(BODY *body);
static BIO *bio_from_store(STORE_S *store);
static STORE_S *get_part_contents(long msgno, const char *section);
static PKCS7 *get_pkcs7_from_part(long msgno, const char *section);
-static int do_signature_verify(PKCS7 *p7, BIO *in, BIO *out);
+static int do_signature_verify(PKCS7 *p7, BIO *in, BIO *out, int silent);
static int do_detached_signature_verify(BODY *b, long msgno, char *section);
static PERSONAL_CERT *find_certificate_matching_pkcs7(PKCS7 *p7);
static int do_decoding(BODY *b, long msgno, const char *section);
@@ -1081,7 +1082,7 @@ dump_bio_to_file(BIO *in, char *filename)
* manufactured body.
*/
static void
-create_local_cache(char *base, BODY *b)
+create_local_cache(char *h, char *base, BODY *b)
{
if(b->type==TYPEMULTIPART){
PART *p;
@@ -1098,9 +1099,10 @@ create_local_cache(char *base, BODY *b)
#endif
for(p=b->nested.part; p; p=p->next)
- create_local_cache(base, (BODY*) p);
+ create_local_cache(h, base, (BODY*) p);
}
else{
+ cpytxt(&b->mime.text, h+b->mime.offset, b->mime.text.size);
cpytxt(&b->contents.text, base + b->contents.offset, b->size.bytes);
}
}
@@ -1160,11 +1162,9 @@ load_private_key(PERSONAL_CERT *pcert)
ps_global->smime->entered_passphrase = 0;
}
- /* Indicate to the UI that we need re-entry (see mailcmd.c:process_cmd())*/
- if(ps_global->smime)
- ps_global->smime->need_passphrase = 1;
-
if(ps_global->smime){
+ /* Indicate to the UI that we need re-entry (see mailcmd.c:process_cmd())*/
+ ps_global->smime->need_passphrase = 1;
if(ps_global->smime->passphrase_emailaddr){
int i;
for(i = 0; ps_global->smime->passphrase_emailaddr[i] != NULL; i++)
@@ -1550,9 +1550,10 @@ get_pkcs7_from_part(long msgno,const char *section)
* p7 - the pkcs7 object to verify
* in - the plain data to verify (NULL if not detached)
* out - BIO to which to write the opaque data
+ * silent - if non zero, do not print errors, only print success.
*/
static int
-do_signature_verify(PKCS7 *p7, BIO *in, BIO *out)
+do_signature_verify(PKCS7 *p7, BIO *in, BIO *out, int silent)
{
STACK_OF(X509) *otherCerts = NULL;
int result;
@@ -1565,7 +1566,7 @@ do_signature_verify(PKCS7 *p7, BIO *in, BIO *out)
#endif
if(!s_cert_store){
- q_status_message(SM_ORDER | SM_DING, 2, 2,
+ if(!silent) q_status_message(SM_ORDER | SM_DING, 2, 2,
_("Couldn't verify S/MIME signature: No CA Certs were loaded"));
return -1;
@@ -1586,44 +1587,36 @@ do_signature_verify(PKCS7 *p7, BIO *in, BIO *out)
PKCS7_verify(p7, otherCerts, s_cert_store, in, out, PKCS7_NOVERIFY);
}
-
- q_status_message1(SM_ORDER | SM_DING, 3, 3,
+ if (!silent) q_status_message1(SM_ORDER | SM_DING, 3, 3,
_("Couldn't verify S/MIME signature: %s"), (char*) openssl_error_string());
}
/* now try to extract the certificates of any signers */
{
- STACK_OF(X509) *signers;
- int i;
-
- signers = PKCS7_get0_signers(p7, NULL, 0);
+ STACK_OF(X509) *signers;
+ int i;
- if(signers)
- for(i=0; i<sk_X509_num(signers); i++){
+ if((signers = PKCS7_get0_signers(p7, NULL, 0)) != NULL)
+ for(i=0; i<sk_X509_num(signers); i++){
char **email;
- X509 *x = sk_X509_value(signers,i);
- X509 *cert;
-
- if(!x)
- continue;
+ X509 *x, *cert;
- email = get_x509_subject_email(x);
-
- if(email){
+ if((x = sk_X509_value(signers,i)) == NULL)
+ continue;
+
+ if((email = get_x509_subject_email(x)) != NULL){
int i;
for(i = 0; email[i] != NULL; i++){
- cert = get_cert_for(email[i]);
- if(cert)
+ if((cert = get_cert_for(email[i])) != NULL)
X509_free(cert);
else
save_cert_for(email[i], x);
fs_give((void **) &email[i]);
}
fs_give((void **) email);
- }
- }
-
- sk_X509_free(signers);
+ }
+ }
+ sk_X509_free(signers);
}
return result;
@@ -1639,7 +1632,8 @@ free_smime_body_sparep(void **sparep)
}
}
-/* Big comment, explaining the mess that exists out there
+/* Big comment, explaining the mess that exists out there, and how we deal
+ with it, and also how we solve the problems that are created this way.
When Alpine sends a message, it constructs that message, computes the
signature, but then it forgets the message it signed and reconstructs it
@@ -1672,6 +1666,19 @@ free_smime_body_sparep(void **sparep)
3. We do not add \r\n to validate a message that we sent, because that
would only work in Alpine, and not in any other client. That would not
be a good thing to do.
+
+ PART II
+
+ Now we have to deal with encrypted and signed messages. The problem is that
+ c-client makes all its pointers point to "on disk" content, but since we
+ decrypted the data earlier, we have to make sure of two things. One is that we
+ saved that data (so we do not have to decrypt it again) and second that we can
+ use it.
+
+ In order to save the data we use create_local_cache, so that we do not
+ have to redecrypt the message. Once this is saved, c-client functions will
+ find it and send it to us in mail_fetch_mime and mail_fetch_body.
+
*/
/*
@@ -1704,11 +1711,8 @@ do_detached_signature_verify(BODY *b, long msgno, char *section)
snprintf(newSec, sizeof(newSec), "%s%s2", section ? section : "", (section && *section) ? "." : "");
- if((p7 = get_pkcs7_from_part(msgno, newSec)) == NULL)
- return modified_the_body;
-
- /* first try with what get got */
- if((in = BIO_new(BIO_s_mem())) == NULL)
+ if((p7 = get_pkcs7_from_part(msgno, newSec)) == NULL
+ || (in = BIO_new(BIO_s_mem())) == NULL)
return modified_the_body;
(void) BIO_reset(in);
@@ -1716,20 +1720,18 @@ do_detached_signature_verify(BODY *b, long msgno, char *section)
BIO_write(in, bodytext, bodylen);
/* Try compatibility with the past and check if this message
- validates when we remove the last two characters
+ * validates when we remove the last two characters. Silence
+ * any failures first.
*/
- if(((result = do_signature_verify(p7, in, NULL)) == 0)
+ if(((result = do_signature_verify(p7, in, NULL, 1)) == 0)
&& bodylen > 2
&& (strncmp(bodytext+bodylen-2,"\r\n", 2) == 0)){
- BIO_free(in);
- if((in = BIO_new(BIO_s_mem())) == NULL)
- return modified_the_body;
-
- (void) BIO_reset(in);
- BIO_write(in, mimetext, mimelen);
- BIO_write(in, bodytext, bodylen-2);
+ BUF_MEM *biobuf = NULL;
- result = do_signature_verify(p7, in, NULL);
+ BIO_get_mem_ptr(in, &biobuf);
+ if(biobuf)
+ BUF_MEM_grow(biobuf, mimelen + bodylen - 2);
+ result = do_signature_verify(p7, in, NULL, 0);
}
BIO_free(in);
@@ -1945,6 +1947,8 @@ do_decoding(BODY *b, long msgno, const char *section)
b->sparep = p7;
}
+ dprint((1, "type_is_signed = %d, type_is_enveloped = %d", PKCS7_type_is_signed(p7), PKCS7_type_is_enveloped(p7)));
+
if(PKCS7_type_is_signed(p7)){
int sigok;
@@ -1952,12 +1956,11 @@ do_decoding(BODY *b, long msgno, const char *section)
(void) BIO_reset(out);
BIO_puts(out, "MIME-Version: 1.0\r\n"); /* needed so rfc822_parse_msg_full believes it's MIME */
- sigok = do_signature_verify(p7, NULL, out);
-
- /* shouldn't really duplicate these messages */
- what_we_did = sigok ? _("This message was cryptographically signed.") :
- _("This message was cryptographically signed but the signature could not be verified.");
-
+ sigok = do_signature_verify(p7, NULL, out, 0);
+
+ what_we_did = sigok ? _("This message was cryptographically signed.") :
+ _("This message was cryptographically signed but the signature could not be verified.");
+
/* make sure it's null terminated */
BIO_write(out, null, 1);
}
@@ -2041,9 +2044,11 @@ do_decoding(BODY *b, long msgno, const char *section)
bstart += 4; /* skip over CRLF*2 */
INIT(&s, mail_string, bstart, strlen(bstart));
- rfc822_parse_msg_full(&env, &body, h, bstart-h-2, &s, BADHOST, 0, 0);
+ rfc822_parse_msg_full(&env, &body, h, (bstart-h)-2, &s, BADHOST, 0, 0);
mail_free_envelope(&env); /* Don't care about this */
+ body->mime.offset = 0;
+ body->mime.text.size = 0;
/*
* Now convert original body (application/pkcs7-mime)
* to a multipart body with one sub-part (the decrypted body).
@@ -2087,7 +2092,7 @@ do_decoding(BODY *b, long msgno, const char *section)
* IMPORTANT BIT: set the body->contents.text.data elements to contain the decrypted
* data. Otherwise, it'll try to load it from the original data. Eek.
*/
- create_local_cache(bstart, &b->nested.part->body);
+ create_local_cache(bstart-b->nested.part->body.mime.offset, bstart, &b->nested.part->body);
modified_the_body = 1;
}
generated by cgit v1.2.3-54-g00ecf (git 2.44.0) at 2024-07-04 18:50:31 +0000