Hello Srikrishan,
On 5/22/19 8:05 AM, Srikrishan Malik wrote:
> This tunable will control the checks on server certs for a TLS session
> similar to ldap.conf(5).
> LDAP_ca_cert can be skipped if LDAP_tls_reqcert is set to "never"
>
> Signed-off-by: Srikrishan Malik <srikrishanmalik@xxxxxxxxx>
Would it be possible to added LDAP_tls_reqcert to idmap.conf,
commented out and explaining what it does? Similar to the other
commented out LDAP variables in that file.
steved.
> ---
> support/nfsidmap/umich_ldap.c | 57 +++++++++++++++++++++++++++++------
> 1 file changed, 47 insertions(+), 10 deletions(-)
>
> diff --git a/support/nfsidmap/umich_ldap.c b/support/nfsidmap/umich_ldap.c
> index 10d1d979..b7445c37 100644
> --- a/support/nfsidmap/umich_ldap.c
> +++ b/support/nfsidmap/umich_ldap.c
> @@ -100,6 +100,7 @@ struct umich_ldap_info {
> char *passwd; /* Password to use when binding to directory */
> int use_ssl; /* SSL flag */
> char *ca_cert; /* File location of the ca_cert */
> + int tls_reqcert; /* req and validate server cert */
> int memberof_for_groups;/* Use 'memberof' attribute when
> looking up user groups */
> int ldap_timeout; /* Timeout in seconds for searches
> @@ -118,6 +119,7 @@ static struct umich_ldap_info ldap_info = {
> .passwd = NULL,
> .use_ssl = 0,
> .ca_cert = NULL,
> + .tls_reqcert = LDAP_OPT_X_TLS_HARD,
> .memberof_for_groups = 0,
> .ldap_timeout = DEFAULT_UMICH_SEARCH_TIMEOUT,
> };
> @@ -153,7 +155,7 @@ ldap_init_and_bind(LDAP **pld,
> LDAPAPIInfo apiinfo = {.ldapai_info_version = LDAP_API_INFO_VERSION};
>
> snprintf(server_url, sizeof(server_url), "%s://%s:%d",
> - (linfo->use_ssl && linfo->ca_cert) ? "ldaps" : "ldap",
> + (linfo->use_ssl) ? "ldaps" : "ldap",
> linfo->server, linfo->port);
>
> /*
> @@ -208,9 +210,8 @@ ldap_init_and_bind(LDAP **pld,
> }
>
> /* Set option to to use SSL/TLS if requested */
> - if (linfo->use_ssl && linfo->ca_cert) {
> + if (linfo->use_ssl) {
> int tls_type = LDAP_OPT_X_TLS_HARD;
> -
> lerr = ldap_set_option(ld, LDAP_OPT_X_TLS, &tls_type);
> if (lerr != LDAP_SUCCESS) {
> IDMAP_LOG(2, ("ldap_init_and_bind: setting SSL "
> @@ -218,11 +219,23 @@ ldap_init_and_bind(LDAP **pld,
> ldap_err2string(lerr), lerr));
> goto out;
> }
> - lerr = ldap_set_option(NULL, LDAP_OPT_X_TLS_CACERTFILE,
> - linfo->ca_cert);
> +
> + if (linfo->ca_cert != NULL) {
> + lerr = ldap_set_option(NULL, LDAP_OPT_X_TLS_CACERTFILE,
> + linfo->ca_cert);
> + if (lerr != LDAP_SUCCESS) {
> + IDMAP_LOG(2, ("ldap_init_and_bind: setting CA "
> + "certificate file failed : %s (%d)",
> + ldap_err2string(lerr), lerr));
> + goto out;
> + }
> + }
> +
> + lerr = ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT,
> + &linfo->tls_reqcert);
> if (lerr != LDAP_SUCCESS) {
> - IDMAP_LOG(2, ("ldap_init_and_bind: setting CA "
> - "certificate file failed : %s (%d)",
> + IDMAP_LOG(2, ("ldap_init_and_bind: setting "
> + "req CA cert failed : %s(%d)",
> ldap_err2string(lerr), lerr));
> goto out;
> }
> @@ -1098,7 +1111,7 @@ out_err:
> static int
> umichldap_init(void)
> {
> - char *tssl, *canonicalize, *memberof;
> + char *tssl, *canonicalize, *memberof, *cert_req;
> char missing_msg[128] = "";
> char *server_in, *canon_name;
>
> @@ -1119,6 +1132,24 @@ umichldap_init(void)
> else
> ldap_info.use_ssl = 0;
> ldap_info.ca_cert = conf_get_str(LDAP_SECTION, "LDAP_CA_CERT");
> + cert_req = conf_get_str(LDAP_SECTION, "LDAP_tls_reqcert");
> + if (cert_req != NULL) {
> + if (strcasecmp(cert_req, "hard") == 0)
> + ldap_info.tls_reqcert = LDAP_OPT_X_TLS_HARD;
> + else if (strcasecmp(cert_req, "demand") == 0)
> + ldap_info.tls_reqcert = LDAP_OPT_X_TLS_DEMAND;
> + else if (strcasecmp(cert_req, "try") == 0)
> + ldap_info.tls_reqcert = LDAP_OPT_X_TLS_TRY;
> + else if (strcasecmp(cert_req, "allow") == 0)
> + ldap_info.tls_reqcert = LDAP_OPT_X_TLS_ALLOW;
> + else if (strcasecmp(cert_req, "never") == 0)
> + ldap_info.tls_reqcert = LDAP_OPT_X_TLS_NEVER;
> + else {
> + IDMAP_LOG(0, ("umichldap_init: Invalid value(%s) for "
> + "LDAP_tls_reqcert."));
> + goto fail;
> + }
> + }
> /* vary the default port depending on whether they use SSL or not */
> ldap_info.port = conf_get_num(LDAP_SECTION, "LDAP_port",
> (ldap_info.use_ssl) ?
> @@ -1230,9 +1261,12 @@ umichldap_init(void)
> if (ldap_info.group_tree == NULL || strlen(ldap_info.group_tree) == 0)
> ldap_info.group_tree = ldap_info.base;
>
> - if (ldap_info.use_ssl && ldap_info.ca_cert == NULL) {
> + if (ldap_info.use_ssl &&
> + ldap_info.tls_reqcert != LDAP_OPT_X_TLS_NEVER &&
> + ldap_info.ca_cert == NULL) {
> IDMAP_LOG(0, ("umichldap_init: You must specify LDAP_ca_cert "
> - "with LDAP_use_ssl=yes"));
> + "with LDAP_use_ssl=yes and "
> + "LDAP_tls_reqcert not set to \"never\""));
> goto fail;
> }
>
> @@ -1257,6 +1291,9 @@ umichldap_init(void)
> ldap_info.use_ssl ? "yes" : "no"));
> IDMAP_LOG(1, ("umichldap_init: ca_cert : %s",
> ldap_info.ca_cert ? ldap_info.ca_cert : "<not-supplied>"));
> + IDMAP_LOG(1, ("umichldap_init: tls_reqcert : %s(%d)",
> + cert_req ? cert_req : "<not-supplied>",
> + ldap_info.tls_reqcert));
> IDMAP_LOG(1, ("umichldap_init: use_memberof_for_groups : %s",
> ldap_info.memberof_for_groups ? "yes" : "no"));
>
>
