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MINOR: ssl: Export a generic function to parse an alpn string

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Parsing of an alpn string has been moved in a dedicated function and exposed to
be used from outside the ssl_sock module.
This commit is contained in:
Christopher Faulet 2020-04-20 18:32:29 +02:00
parent 9857232c9f
commit d75f57e94c
2 changed files with 53 additions and 54 deletions
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1
include/proto/ssl_sock.h
View File

@ -57,6 +57,7 @@ const char *ssl_sock_get_sni(struct connection *conn);
const char *ssl_sock_get_cert_sig(struct connection *conn); const char *ssl_sock_get_cert_sig(struct connection *conn);
const char *ssl_sock_get_cipher_name(struct connection *conn); const char *ssl_sock_get_cipher_name(struct connection *conn);
const char *ssl_sock_get_proto_version(struct connection *conn); const char *ssl_sock_get_proto_version(struct connection *conn);
int ssl_sock_parse_alpn(char *arg, char **alpn_str, int *alpn_len, char **err);
void ssl_sock_set_alpn(struct connection *conn, const unsigned char *, int); void ssl_sock_set_alpn(struct connection *conn, const unsigned char *, int);
void ssl_sock_set_servername(struct connection *conn, const char *hostname); void ssl_sock_set_servername(struct connection *conn, const char *hostname);

106
src/ssl_sock.c
View File

@ -9455,39 +9455,45 @@ static int bind_parse_npn(char **args, int cur_arg, struct proxy *px, struct bin
return ssl_bind_parse_npn(args, cur_arg, px, &conf->ssl_conf, err); return ssl_bind_parse_npn(args, cur_arg, px, &conf->ssl_conf, err);
} }
/* parse the "alpn" bind keyword */
static int ssl_bind_parse_alpn(char **args, int cur_arg, struct proxy *px, struct ssl_bind_conf *conf, char **err) /* Parses a alpn string and converts it to the right format for the SSL api */
int ssl_sock_parse_alpn(char *arg, char **alpn_str, int *alpn_len, char **err)
{ {
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation char *p1, *p2, *alpn = NULL;
char *p1, *p2; int len, ret = 0;
if (!*args[cur_arg + 1]) { *alpn_str = NULL;
memprintf(err, "'%s' : missing the comma-delimited ALPN protocol suite", args[cur_arg]); *alpn_len = 0;
return ERR_ALERT | ERR_FATAL;
if (!*arg) {
memprintf(err, "missing the comma-delimited ALPN protocol suite");
goto error;
} }
free(conf->alpn_str);
/* the ALPN string is built as a suite of (<len> <name>)*, /* the ALPN string is built as a suite of (<len> <name>)*,
* so we reuse each comma to store the next <len> and need * so we reuse each comma to store the next <len> and need
* one more for the end of the string. * one more for the end of the string.
*/ */
conf->alpn_len = strlen(args[cur_arg + 1]) + 1; len = strlen(arg) + 1;
conf->alpn_str = calloc(1, conf->alpn_len + 1); alpn = calloc(1, len+1);
memcpy(conf->alpn_str + 1, args[cur_arg + 1], conf->alpn_len); if (!alpn) {
memprintf(err, "'%s' : out of memory", arg);
goto error;
}
memcpy(alpn+1, arg, len);
/* replace commas with the name length */ /* replace commas with the name length */
p1 = conf->alpn_str; p1 = alpn;
p2 = p1 + 1; p2 = p1 + 1;
while (1) { while (1) {
p2 = memchr(p1 + 1, ',', conf->alpn_str + conf->alpn_len - (p1 + 1)); p2 = memchr(p1 + 1, ',', alpn + len - (p1 + 1));
if (!p2) if (!p2)
p2 = p1 + 1 + strlen(p1 + 1); p2 = p1 + 1 + strlen(p1 + 1);
if (p2 - (p1 + 1) > 255) { if (p2 - (p1 + 1) > 255) {
*p2 = '\0'; *p2 = '\0';
memprintf(err, "'%s' : ALPN protocol name too long : '%s'", args[cur_arg], p1 + 1); memprintf(err, "ALPN protocol name too long : '%s'", p1 + 1);
return ERR_ALERT | ERR_FATAL; goto error;
} }
*p1 = p2 - (p1 + 1); *p1 = p2 - (p1 + 1);
@ -9498,7 +9504,31 @@ static int ssl_bind_parse_alpn(char **args, int cur_arg, struct proxy *px, struc
*(p2++) = '\0'; *(p2++) = '\0';
} }
return 0;
*alpn_str = alpn;
*alpn_len = len;
out:
return ret;
error:
free(alpn);
ret = ERR_ALERT | ERR_FATAL;
goto out;
}
/* parse the "alpn" bind keyword */
static int ssl_bind_parse_alpn(char **args, int cur_arg, struct proxy *px, struct ssl_bind_conf *conf, char **err)
{
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
int ret;
free(conf->alpn_str);
ret = ssl_sock_parse_alpn(args[cur_arg + 1], &conf->alpn_str, &conf->alpn_len, err);
if (ret)
memprintf(err, "'%s' : %s", args[cur_arg], *err);
return ret;
#else #else
memprintf(err, "'%s' : library does not support TLS ALPN extension", args[cur_arg]); memprintf(err, "'%s' : library does not support TLS ALPN extension", args[cur_arg]);
return ERR_ALERT | ERR_FATAL; return ERR_ALERT | ERR_FATAL;
@ -9769,9 +9799,9 @@ static int srv_parse_npn(char **args, int *cur_arg, struct proxy *px, struct ser
static int srv_parse_alpn(char **args, int *cur_arg, struct proxy *px, struct server *newsrv, char **err) static int srv_parse_alpn(char **args, int *cur_arg, struct proxy *px, struct server *newsrv, char **err)
{ {
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
char *p1, *p2;
char **alpn_str; char **alpn_str;
int *alpn_len; int *alpn_len;
int ret;
if (*args[*cur_arg] == 'c') { if (*args[*cur_arg] == 'c') {
alpn_str = &newsrv->check.alpn_str; alpn_str = &newsrv->check.alpn_str;
@ -9781,44 +9811,12 @@ static int srv_parse_alpn(char **args, int *cur_arg, struct proxy *px, struct se
alpn_len = &newsrv->ssl_ctx.alpn_len; alpn_len = &newsrv->ssl_ctx.alpn_len;
} }
if (!*args[*cur_arg + 1]) {
memprintf(err, "'%s' : missing the comma-delimited ALPN protocol suite", args[*cur_arg]);
return ERR_ALERT | ERR_FATAL;
}
free(*alpn_str); free(*alpn_str);
ret = ssl_sock_parse_alpn(args[*cur_arg + 1], alpn_str, alpn_len, err);
/* the ALPN string is built as a suite of (<len> <name>)*, if (ret)
* so we reuse each comma to store the next <len> and need memprintf(err, "'%s' : %s", args[*cur_arg], *err);
* one more for the end of the string. return ret;
*/
*alpn_len = strlen(args[*cur_arg + 1]) + 1;
*alpn_str = calloc(1, *alpn_len + 1);
memcpy(*alpn_str + 1, args[*cur_arg + 1], *alpn_len);
/* replace commas with the name length */
p1 = *alpn_str;
p2 = p1 + 1;
while (1) {
p2 = memchr(p1 + 1, ',', *alpn_str + *alpn_len - (p1 + 1));
if (!p2)
p2 = p1 + 1 + strlen(p1 + 1);
if (p2 - (p1 + 1) > 255) {
*p2 = '\0';
memprintf(err, "'%s' : ALPN protocol name too long : '%s'", args[*cur_arg], p1 + 1);
return ERR_ALERT | ERR_FATAL;
}
*p1 = p2 - (p1 + 1);
p1 = p2;
if (!*p2)
break;
*(p2++) = '\0';
}
return 0;
#else #else
memprintf(err, "'%s' : library does not support TLS ALPN extension", args[*cur_arg]); memprintf(err, "'%s' : library does not support TLS ALPN extension", args[*cur_arg]);
return ERR_ALERT | ERR_FATAL; return ERR_ALERT | ERR_FATAL;