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dtls: Add support for ephemeral DTLS certificates.

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This mimics the behavior of Chrome and Firefox and creates an ephemeral
X.509 certificate for each DTLS session.

Currently, the only supported key type is ECDSA because of its faster
generation time, but other key types can be added in the future as
necessary.

ASTERISK-27395

Change-Id: I5122e5f4b83c6320cc17407a187fcf491daf30b4
This commit is contained in:
Sean Bright
2017-09-29 14:50:17 +00:00
committed by Joshua Colp
parent be5b7b2076
commit 04d3785a79
10 changed files with 409 additions and 81 deletions
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22
main/rtp_engine.c
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@@ -2717,6 +2717,8 @@ int ast_rtp_dtls_cfg_parse(struct ast_rtp_dtls_cfg *dtls_cfg, const char *name,
if (sscanf(value, "%30u", &dtls_cfg->rekey) != 1) {
return -1;
}
} else if (!strcasecmp(name, "dtlsautogeneratecert")) {
dtls_cfg->ephemeral_cert = ast_true(value) ? 1 : 0;
} else if (!strcasecmp(name, "dtlscertfile")) {
if (!ast_strlen_zero(value) && !ast_file_is_readable(value)) {
ast_log(LOG_ERROR, "%s file %s does not exist or is not readable\n", name, value);
@@ -2769,6 +2771,25 @@ int ast_rtp_dtls_cfg_parse(struct ast_rtp_dtls_cfg *dtls_cfg, const char *name,
return 0;
}
int ast_rtp_dtls_cfg_validate(struct ast_rtp_dtls_cfg *dtls_cfg)
{
if (dtls_cfg->ephemeral_cert) {
if (!ast_strlen_zero(dtls_cfg->certfile)) {
ast_log(LOG_ERROR, "You cannot request automatically generated certificates"
" (dtls_auto_generate_cert) and also specify a certificate file"
" (dtls_cert_file) at the same time\n");
return -1;
} else if (!ast_strlen_zero(dtls_cfg->pvtfile)
|| !ast_strlen_zero(dtls_cfg->cafile)
|| !ast_strlen_zero(dtls_cfg->capath)) {
ast_log(LOG_NOTICE, "dtls_pvt_file, dtls_cafile, and dtls_ca_path are"
" ignored when dtls_auto_generate_cert is enabled\n");
}
}
return 0;
}
void ast_rtp_dtls_cfg_copy(const struct ast_rtp_dtls_cfg *src_cfg, struct ast_rtp_dtls_cfg *dst_cfg)
{
ast_rtp_dtls_cfg_free(dst_cfg); /* Prevent a double-call leaking memory via ast_strdup */
@@ -2778,6 +2799,7 @@ void ast_rtp_dtls_cfg_copy(const struct ast_rtp_dtls_cfg *src_cfg, struct ast_rt
dst_cfg->rekey = src_cfg->rekey;
dst_cfg->suite = src_cfg->suite;
dst_cfg->hash = src_cfg->hash;
dst_cfg->ephemeral_cert = src_cfg->ephemeral_cert;
dst_cfg->certfile = ast_strdup(src_cfg->certfile);
dst_cfg->pvtfile = ast_strdup(src_cfg->pvtfile);
dst_cfg->cipher = ast_strdup(src_cfg->cipher);