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srtp-utils: Strip padding characters in crypto attribute lines

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https://www.rfc-editor.org/rfc/rfc4568.html#section-6.1 says:
 When base64 decoding the key and salt, padding characters (i.e.,
 one or two "=" at the end of the base64-encoded data) are discarded
 (see [RFC3548] for details).

https://www.rfc-editor.org/rfc/rfc3548#section-2.2 says:
 In some circumstances, the use of padding ("=") in base encoded data
 is not required nor used.  In the general case, when assumptions on
 size of transported data cannot be made, padding is required to yield
 correct decoded data.
This commit is contained in:
Дилян Палаузов 2023-02-11 19:52:37 +02:00 committed by Evangelos Ribeiro Tzaras
parent 037d2c55f6
commit cfd371d72e
1 changed files with 12 additions and 1 deletions
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13
plugins/provider/sip/calls-srtp-utils.c
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@ -584,8 +584,19 @@ calls_srtp_print_sdp_crypto_attribute (calls_srtp_crypto_attribute *attr,
/* key parameters */
for (guint i = 0; i < attr->n_key_params; i++) {
calls_srtp_crypto_key_param *key_param = &attr->key_params[i];
int keylen = strlen (key_param->b64_keysalt);
g_string_append_printf (attr_str, "inline:%s", key_param->b64_keysalt);
/* https://www.rfc-editor.org/rfc/rfc4568.html#section-6.1 says:
When base64 decoding the key and salt, padding characters (i.e.,
one or two "=" at the end of the base64-encoded data) are discarded
(see [RFC3548] for details).
*/
if (key_param->b64_keysalt[keylen - 2] == '=')
g_string_append_printf (attr_str, "inline:%.*s", keylen - 2, key_param->b64_keysalt);
else if (key_param->b64_keysalt[keylen - 1] == '=')
g_string_append_printf (attr_str, "inline:%.*s", keylen - 1, key_param->b64_keysalt);
else
g_string_append_printf (attr_str, "inline:%s", key_param->b64_keysalt);
if (key_param->lifetime_type == CALLS_SRTP_LIFETIME_AS_DECIMAL_NUMBER)
g_string_append_printf (attr_str, "|%" G_GINT64_FORMAT, key_param->lifetime);
if (key_param->lifetime_type == CALLS_SRTP_LIFETIME_AS_POWER_OF_TWO)