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Add --hostbased and --canonical kgetcred options

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This commit is contained in:
Nicolas Williams
2015-03-25 11:16:37 -05:00
parent 0306d70a91
commit 50615d2a37
2 changed files with 160 additions and 37 deletions
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166
kuser/kgetcred.c
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@@ -40,6 +40,8 @@ static char *etype_str;
static int transit_flag = 1;
static int forwardable_flag;
static int canonicalize_flag;
static int is_hostbased_flag;
static int is_canonical_flag;
static char *impersonate_str;
static char *nametype_str;
static int debug;
@@ -54,22 +56,27 @@ struct getargs args[] = {
{ "delegation-credential-cache",0,arg_string, &delegation_cred_str,
NP_("where to find the ticket use for delegation", ""), "cache"},
{ "canonicalize", 0, arg_flag, &canonicalize_flag,
NP_("canonicalize the principal", ""), NULL },
{ "forwardable", 0, arg_flag, &forwardable_flag,
NP_("canonicalize the principal (chase referrals)", ""), NULL },
{ "canonical", 0, arg_flag, &is_canonical_flag,
NP_("the name components are canonical", ""), NULL },
{ "forwardable", 0, arg_flag, &forwardable_flag,
NP_("forwardable ticket requested", ""), NULL},
{ "transit-check", 0, arg_negative_flag, &transit_flag, NULL, NULL },
{ "enctype", 'e', arg_string, &etype_str,
NP_("encryption type to use", ""), "enctype"},
{ "impersonate", 0, arg_string, &impersonate_str,
NP_("client to impersonate", ""), "principal"},
{ "name-type", 0, arg_string, &nametype_str, NULL, NULL },
{ "name-type", 0, arg_string, &nametype_str,
NP_("Kerberos name type", ""), NULL },
{ "hostbased", 'H', arg_flag, &is_hostbased_flag,
NP_("indicate that the name is a host-based service name", ""), NULL },
{ "debug", 0, arg_flag, &debug, NULL, NULL },
{ "version", 0, arg_flag, &version_flag, NULL, NULL },
{ "help", 0, arg_flag, &help_flag, NULL, NULL }
};
static void
usage (int ret)
usage(int ret)
{
arg_printusage(args,
sizeof(args)/sizeof(*args),
@@ -86,6 +93,7 @@ main(int argc, char **argv)
krb5_ccache cache;
krb5_creds *out;
int optidx = 0;
int32_t nametype = KRB5_NT_UNKNOWN;
krb5_get_creds_opt opt;
krb5_principal server = NULL;
krb5_principal impersonate;
@@ -167,88 +175,172 @@ main(int argc, char **argv)
krb5_cc_clear_mcred(&mc);
ret = krb5_cc_get_principal(context, cache, &mc.server);
if (ret)
krb5_err (context, 1, ret, "krb5_cc_get_principal");
krb5_err(context, 1, ret, "krb5_cc_get_principal");
ret = krb5_cc_resolve(context, delegation_cred_str, &id);
if(ret)
krb5_err (context, 1, ret, "krb5_cc_resolve");
krb5_err(context, 1, ret, "krb5_cc_resolve");
ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c);
if(ret)
krb5_err (context, 1, ret, "krb5_cc_retrieve_cred");
krb5_err(context, 1, ret, "krb5_cc_retrieve_cred");
ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL);
if (ret) {
krb5_clear_error_message(context);
krb5_err (context, 1, ret, "decode_Ticket");
krb5_err(context, 1, ret, "decode_Ticket");
}
krb5_free_cred_contents(context, &c);
ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket);
if(ret)
krb5_err (context, 1, ret, "krb5_get_creds_opt_set_ticket");
krb5_err(context, 1, ret, "krb5_get_creds_opt_set_ticket");
free_Ticket(&ticket);
krb5_cc_close (context, id);
krb5_cc_close(context, id);
krb5_free_principal(context, mc.server);
krb5_get_creds_opt_add_options(context, opt,
KRB5_GC_CONSTRAINED_DELEGATION);
}
if (nametype_str) {
int32_t nametype;
char *sname = NULL;
char *hname = NULL;
if (nametype_str != NULL) {
ret = krb5_parse_nametype(context, nametype_str, &nametype);
if (ret)
krb5_err(context, 1, ret, "krb5_parse_nametype");
}
ret = krb5_parse_nametype(context, nametype_str, &nametype);
if (ret)
krb5_err(context, 1, ret, "krb5_parse_nametype");
if (nametype == KRB5_NT_SRV_HST ||
nametype == KRB5_NT_SRV_HST_NEEDS_CANON)
is_hostbased_flag = 1;
if (is_hostbased_flag) {
const char *sname = NULL;
const char *hname = NULL;
if (nametype_str != NULL &&
nametype != KRB5_NT_SRV_HST &&
nametype != KRB5_NT_SRV_HST_NEEDS_CANON)
krb5_errx(context, 1, "--hostbased not compatible with "
"non-hostbased --name-type");
if (is_canonical_flag)
nametype = KRB5_NT_SRV_HST;
else
nametype = KRB5_NT_SRV_HST_NEEDS_CANON;
/*
* Host-based service names can have more than one component.
*
* RFC5179 did not, but should have, assign a Kerberos name-type
* corresponding to GSS_C_NT_DOMAINBASED. But it's basically a
* host-based service name type with one additional component.
*
* So that's how we're treating host-based service names here:
* two or more components.
*/
if (argc == 0) {
usage(1);
} else if (argc == 1) {
krb5_principal server2;
/*
* In this case the one argument is a principal name, not the
* service name.
*
* We parse the argument as a principal name, extract the service
* and hostname components, use krb5_sname_to_principal(), then
* extract the service and hostname components from that.
*/
ret = krb5_parse_name(context, argv[0], &server);
if (ret)
krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]);
sname = krb5_principal_get_comp_string(context, server, 0);
/*
* If a single-component principal name is given, then we'll
* default the hostname, as krb5_principal_get_comp_string()
* returns NULL in this case.
*/
hname = krb5_principal_get_comp_string(context, server, 1);
if (nametype == KRB5_NT_SRV_HST && argc == 2) {
sname = argv[0];
hname = argv[1];
ret = krb5_sname_to_principal(context, hname, sname,
KRB5_NT_SRV_HST, &server);
KRB5_NT_SRV_HST, &server2);
sname = krb5_principal_get_comp_string(context, server2, 0);
hname = krb5_principal_get_comp_string(context, server2, 1);
/*
* Modify the original with the new sname/hname. This way we
* retain any additional principal name components from the given
* principal name.
*
* The name-type is set further below.
*/
ret = krb5_principal_set_comp_string(context, server, 0, sname);
if (ret)
krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]);
ret = krb5_principal_set_comp_string(context, server, 1, hname);
if (ret)
krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]);
krb5_free_principal(context, server2);
} else {
size_t i;
/*
* In this case the arguments are principal name components.
*
* The service and hostname components can be defaulted by passing
* empty strings.
*/
sname = argv[0];
if (*sname == '\0')
sname = NULL;
hname = argv[1];
if (hname == NULL || *hname == '\0')
hname = NULL;
ret = krb5_sname_to_principal(context, hname, sname,
KRB5_NT_SRV_HST, &server);
if (ret)
krb5_err(context, 1, ret, "krb5_sname_to_principal %s/%s",
(sname && *sname) ? sname : "<default>",
(hname && *hname) ? hname : "<default>");
} else {
if (argc != 1)
usage(1);
ret = krb5_parse_name(context, argv[0], &server);
if (ret)
krb5_err (context, 1, ret, "krb5_parse_name %s", argv[0]);
server->name.name_type = (NAME_TYPE)nametype;
krb5_err(context, 1, ret, "krb5_sname_to_principal");
for (i = 2; i < argc; i++) {
ret = krb5_principal_set_comp_string(context, server, i, argv[i]);
if (ret)
krb5_err(context, 1, ret, "krb5_principal_set_comp_string");
}
}
} else if (argc == 1) {
ret = krb5_parse_name(context, argv[0], &server);
if (ret)
krb5_err (context, 1, ret, "krb5_parse_name %s", argv[0]);
krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]);
} else {
usage(1);
}
if (nametype != KRB5_NT_UNKNOWN)
server->name.name_type = (NAME_TYPE)nametype;
ret = krb5_get_creds(context, opt, cache, server, &out);
if (ret)
krb5_err (context, 1, ret, "krb5_get_creds");
krb5_err(context, 1, ret, "krb5_get_creds");
if (out_cache_str) {
krb5_ccache id;
ret = krb5_cc_resolve(context, out_cache_str, &id);
if(ret)
krb5_err (context, 1, ret, "krb5_cc_resolve");
krb5_err(context, 1, ret, "krb5_cc_resolve");
ret = krb5_cc_initialize(context, id, out->client);
if(ret)
krb5_err (context, 1, ret, "krb5_cc_initialize");
krb5_err(context, 1, ret, "krb5_cc_initialize");
ret = krb5_cc_store_cred(context, id, out);
if(ret)
krb5_err (context, 1, ret, "krb5_cc_store_cred");
krb5_cc_close (context, id);
krb5_err(context, 1, ret, "krb5_cc_store_cred");
krb5_cc_close(context, id);
}
krb5_free_creds(context, out);