Hi,
on my GitLab CI build test, the compilation failed with the following
message, while compiling against openssl-1.1:
/usr/bin/ld: ssl_openssl.o: in function `tls_ctx_set_tls_groups':
/builds/ordex986/openvpn/src/openvpn/ssl_openssl.c:611: undefined
reference to `SSL_CTX_set1_groups'
collect2: error: ld returned 1 exit status
Any clue?
On 23/06/2020 11:21, Antonio Quartulli wrote:
> Hi,
>
> On 22/06/2020 16:02, Arne Schwabe wrote:
>
> [CUT]
>
>> @@ -343,6 +348,42 @@ tls_ctx_set_cert_profile(struct tls_root_ctx *ctx,
>> const char *profile)
>> }
>> }
>>
>> +void
>> +tls_ctx_set_tls_groups(struct tls_root_ctx *ctx, const char *groups)
>> +{
>> + ASSERT(ctx);
>> + struct gc_arena gc = gc_new();
>> +
>> + /* Get number of groups and allocate an array in ctx */
>> + int groups_count = get_num_elements(groups, ':');
>> + ALLOC_ARRAY_CLEAR(ctx->groups, mbedtls_ecp_group_id, groups_count + 1)
>> +
>> + /* Parse allowed ciphers, getting IDs */
>> + int i = 0;
>> + char *tmp_groups = string_alloc(groups, &gc);
>> +
>> + const char *token;
>> + while ((token = strsep(&tmp_groups, ":")))
>> + {
>> + const mbedtls_ecp_curve_info *ci =
>> + mbedtls_ecp_curve_info_from_name(token);
>> + if (!ci)
>> + {
>> + msg(M_WARN, "Warning unknown curve/group specified: %s", token);
>> + }
>> + else
>> + {
>> + ctx->groups[i] = ci->grp_id;
>> + i++;
>> + }
>> + token = strsep(&tmp_groups, ":");
>
> The line above should be removed, otherwise end up doing strsep() twice
> in a row.
>
>
>> + }
>> + ctx->groups[i] = MBEDTLS_ECP_DP_NONE;
>> +
>> + gc_free(&gc);
>> +}
>> +
>> +
>> void
>> tls_ctx_check_cert_time(const struct tls_root_ctx *ctx)
>> {
>> @@ -1043,6 +1084,11 @@ key_state_ssl_init(struct key_state_ssl *ks_ssl,
>> mbedtls_ssl_conf_ciphersuites(ks_ssl->ssl_config,
>> ssl_ctx->allowed_ciphers);
>> }
>>
>> + if (ssl_ctx->groups)
>> + {
>> + mbedtls_ssl_conf_curves(ks_ssl->ssl_config, ssl_ctx->groups);
>> + }
>> +
>> /* Disable record splitting (for now). OpenVPN assumes records are sent
>> * unfragmented, and changing that will require thorough review and
>> * testing. Since OpenVPN is not susceptible to BEAST, we can just
>> diff --git a/src/openvpn/ssl_mbedtls.h b/src/openvpn/ssl_mbedtls.h
>> index 92381f1a..0525134f 100644
>> --- a/src/openvpn/ssl_mbedtls.h
>> +++ b/src/openvpn/ssl_mbedtls.h
>> @@ -105,6 +105,7 @@ struct tls_root_ctx {
>> #endif
>> struct external_context external_key; /**< External key context */
>> int *allowed_ciphers; /**< List of allowed ciphers for this
>> connection */
>> + mbedtls_ecp_group_id *groups; /**< List of allowed groups for this
>> connection */
>> mbedtls_x509_crt_profile cert_profile; /**< Allowed certificate types */
>> };
>>
>> diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
>> index a489053b..da7d252a 100644
>> --- a/src/openvpn/ssl_openssl.c
>> +++ b/src/openvpn/ssl_openssl.c
>> @@ -565,6 +565,57 @@ tls_ctx_set_cert_profile(struct tls_root_ctx *ctx,
>> const char *profile)
>> #endif /* ifdef HAVE_SSL_CTX_SET_SECURITY_LEVEL */
>> }
>>
>> +void
>> +tls_ctx_set_tls_groups(struct tls_root_ctx *ctx, const char *groups)
>> +{
>> + ASSERT(ctx);
>> + struct gc_arena gc = gc_new();
>> + /* This method could be as easy as
>> + * SSL_CTX_set1_groups_list(ctx->ctx, groups)
>> + * but OpenSSL does not like the name secp256r1 for prime256v1
>> + * This is one of the important curves.
>> + * To support the same name for OpenSSL and mbedTLS, we do
>> + * this dance.
>> + */
>> +
>> + int groups_count = get_num_elements(groups, ':');
>> +
>> + int *glist;
>> + /* Allocate an array for them */
>> + ALLOC_ARRAY_CLEAR_GC(glist, int, groups_count, &gc);
>> +
>> + /* Parse allowed ciphers, getting IDs */
>> + int glistlen = 0;
>> + char *tmp_groups = string_alloc(groups, &gc);
>> +
>> + const char *token;
>> + while ((token = strsep(&tmp_groups, ":")))
>> + {
>> + if (streq(token, "secp256r1"))
>> + {
>> + token = "prime256v1";
>> + }
>> + int nid = OBJ_sn2nid(token);
>> +
>> + if (nid == 0)
>
> From a style perspective, I think it looks better to add an empty line
> *before* "int nid =..." and remove the one after.
>
> This way we also follow the same pattern:
>
> x = a();
> if (x ..)
> {
> }
>
> as other parts of the code.
>
>
>
>
> The rest looks good to me.
>
> Regards,
>
--
Antonio Quartulli
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