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Diffstat (limited to 'ssl/d1_pkt.c')
-rw-r--r--ssl/d1_pkt.c117
1 files changed, 68 insertions, 49 deletions
diff --git a/ssl/d1_pkt.c b/ssl/d1_pkt.c
index 8270419a8dcea..b2765ba8019ff 100644
--- a/ssl/d1_pkt.c
+++ b/ssl/d1_pkt.c
@@ -120,6 +120,7 @@
#include <openssl/evp.h>
#include <openssl/buffer.h>
#include <openssl/pqueue.h>
+#include <openssl/rand.h>
static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
int len, int peek);
@@ -486,9 +487,9 @@ int dtls1_get_record(SSL *s)
SSL3_RECORD *rr;
SSL_SESSION *sess;
unsigned char *p;
- short version;
+ unsigned short version;
DTLS1_BITMAP *bitmap;
- unsigned int is_next_epoch;
+ unsigned int is_next_epoch;
rr= &(s->s3->rrec);
sess=s->session;
@@ -524,7 +525,7 @@ again:
ssl_minor= *(p++);
version=(ssl_major<<8)|ssl_minor;
- /* sequence number is 64 bits, with top 2 bytes = epoch */
+ /* sequence number is 64 bits, with top 2 bytes = epoch */
n2s(p,rr->epoch);
memcpy(&(s->s3->read_sequence[2]), p, 6);
@@ -535,7 +536,7 @@ again:
/* Lets check version */
if (!s->first_packet)
{
- if (version != s->version)
+ if (version != s->version && version != DTLS1_BAD_VER)
{
SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
/* Send back error using their
@@ -546,7 +547,8 @@ again:
}
}
- if ((version & 0xff00) != (DTLS1_VERSION & 0xff00))
+ if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
+ (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
{
SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
goto err;
@@ -559,6 +561,7 @@ again:
goto f_err;
}
+ s->client_version = version;
/* now s->rstate == SSL_ST_READ_BODY */
}
@@ -808,6 +811,14 @@ start:
* may be fragmented--don't always expect dest_maxlen bytes */
if ( rr->length < dest_maxlen)
{
+#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
+ /*
+ * for normal alerts rr->length is 2, while
+ * dest_maxlen is 7 if we were to handle this
+ * non-existing alert...
+ */
+ FIX ME
+#endif
s->rstate=SSL_ST_READ_HEADER;
rr->length = 0;
goto start;
@@ -973,47 +984,40 @@ start:
}
if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
- {
- struct ccs_header_st ccs_hdr;
+ {
+ struct ccs_header_st ccs_hdr;
dtls1_get_ccs_header(rr->data, &ccs_hdr);
- if ( ccs_hdr.seq == s->d1->handshake_read_seq)
- {
- /* 'Change Cipher Spec' is just a single byte, so we know
- * exactly what the record payload has to look like */
- /* XDTLS: check that epoch is consistent */
- if ( (rr->length != DTLS1_CCS_HEADER_LENGTH) ||
- (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
- {
- i=SSL_AD_ILLEGAL_PARAMETER;
- SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
- goto err;
- }
-
- rr->length=0;
-
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
- rr->data, 1, s, s->msg_callback_arg);
-
- s->s3->change_cipher_spec=1;
- if (!ssl3_do_change_cipher_spec(s))
- goto err;
-
- /* do this whenever CCS is processed */
- dtls1_reset_seq_numbers(s, SSL3_CC_READ);
-
- /* handshake read seq is reset upon handshake completion */
- s->d1->handshake_read_seq++;
-
- goto start;
- }
- else
+ /* 'Change Cipher Spec' is just a single byte, so we know
+ * exactly what the record payload has to look like */
+ /* XDTLS: check that epoch is consistent */
+ if ( (s->client_version == DTLS1_BAD_VER && rr->length != 3) ||
+ (s->client_version != DTLS1_BAD_VER && rr->length != DTLS1_CCS_HEADER_LENGTH) ||
+ (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
{
- rr->length = 0;
- goto start;
+ i=SSL_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
+ goto err;
}
+
+ rr->length=0;
+
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
+ rr->data, 1, s, s->msg_callback_arg);
+
+ s->s3->change_cipher_spec=1;
+ if (!ssl3_do_change_cipher_spec(s))
+ goto err;
+
+ /* do this whenever CCS is processed */
+ dtls1_reset_seq_numbers(s, SSL3_CC_READ);
+
+ if (s->client_version == DTLS1_BAD_VER)
+ s->d1->handshake_read_seq++;
+
+ goto start;
}
/* Unexpected handshake message (Client Hello, or protocol violation) */
@@ -1255,7 +1259,7 @@ int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
else
s->s3->wnum += i;
- return tot + i;
+ return i;
}
int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
@@ -1341,8 +1345,12 @@ int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len,
*(p++)=type&0xff;
wr->type=type;
- *(p++)=(s->version>>8);
- *(p++)=s->version&0xff;
+ if (s->client_version == DTLS1_BAD_VER)
+ *(p++) = DTLS1_BAD_VER>>8,
+ *(p++) = DTLS1_BAD_VER&0xff;
+ else
+ *(p++)=(s->version>>8),
+ *(p++)=s->version&0xff;
/* field where we are to write out packet epoch, seq num and len */
pseq=p;
@@ -1397,8 +1405,14 @@ int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len,
/* ssl3_enc can only have an error on read */
- wr->length += bs; /* bs != 0 in case of CBC. The enc fn provides
- * the randomness */
+ if (bs) /* bs != 0 in case of CBC */
+ {
+ RAND_pseudo_bytes(p,bs);
+ /* master IV and last CBC residue stand for
+ * the rest of randomness */
+ wr->length += bs;
+ }
+
s->method->ssl3_enc->enc(s,1);
/* record length after mac and block padding */
@@ -1570,7 +1584,7 @@ int dtls1_dispatch_alert(SSL *s)
{
int i,j;
void (*cb)(const SSL *ssl,int type,int val)=NULL;
- unsigned char buf[2 + 2 + 3]; /* alert level + alert desc + message seq +frag_off */
+ unsigned char buf[DTLS1_AL_HEADER_LENGTH];
unsigned char *ptr = &buf[0];
s->s3->alert_dispatch=0;
@@ -1579,6 +1593,7 @@ int dtls1_dispatch_alert(SSL *s)
*ptr++ = s->s3->send_alert[0];
*ptr++ = s->s3->send_alert[1];
+#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
{
s2n(s->d1->handshake_read_seq, ptr);
@@ -1594,6 +1609,7 @@ int dtls1_dispatch_alert(SSL *s)
#endif
l2n3(s->d1->r_msg_hdr.frag_off, ptr);
}
+#endif
i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
if (i <= 0)
@@ -1603,8 +1619,11 @@ int dtls1_dispatch_alert(SSL *s)
}
else
{
- if ( s->s3->send_alert[0] == SSL3_AL_FATAL ||
- s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
+ if (s->s3->send_alert[0] == SSL3_AL_FATAL
+#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
+ || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
+#endif
+ )
(void)BIO_flush(s->wbio);
if (s->msg_callback)
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-21 13:35:56 +0000