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kadmind: Add missing error checks

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This commit is contained in:
Nicolas Williams
2022-01-19 16:33:37 -06:00
parent 655c057769
commit 1b213c1082
1 changed files with 127 additions and 181 deletions
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272
kadmin/server.c
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@@ -42,7 +42,8 @@ static kadm5_ret_t
kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
krb5_data *in, krb5_data *out, int readonly)
{
kadm5_ret_t ret;
kadm5_ret_t ret = 0;
kadm5_ret_t ret_sp = 0;
int32_t cmd, mask, kvno, tmp;
kadm5_server_context *contextp = kadm_handlep;
char client[128], name[128], name2[128];
@@ -58,19 +59,27 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
char **princs;
int n_princs;
int keys_ok = 0;
krb5_storage *sp;
krb5_storage *rsp = NULL; /* response goes here */
krb5_storage *sp = NULL;
int len;
krb5_unparse_name_fixed(contextp->context, contextp->caller,
memset(&ent, 0, sizeof(ent));
memset(&ent_prev, 0, sizeof(ent_prev));
krb5_data_zero(out);
ret = krb5_unparse_name_fixed(contextp->context, contextp->caller,
client, sizeof(client));
if (ret == 0) {
rsp = krb5_storage_emem();
sp = krb5_storage_from_data(in);
if (sp == NULL) {
if (rsp == NULL || sp == NULL)
ret = krb5_enomem(contextp->context);
goto fail;
}
if (ret == 0)
ret = krb5_ret_int32(sp, &cmd);
if (ret)
goto fail;
krb5_ret_int32(sp, &cmd);
switch(cmd){
case kadm_get:{
op = "GET";
@@ -121,20 +130,14 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
}
ret = kadm5_get_principal(kadm_handlep, princ, &ent, mask);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
if (ret == 0) {
if (keys_ok)
kadm5_store_principal_ent(sp, &ent);
else
kadm5_store_principal_ent_nokeys(sp, &ent);
kadm5_free_principal_ent(kadm_handlep, &ent);
if (ret_sp == 0 && keys_ok)
ret_sp = kadm5_store_principal_ent(rsp, &ent);
else if (ret_sp == 0)
ret_sp = kadm5_store_principal_ent_nokeys(rsp, &ent);
}
kadm5_free_principal_ent(kadm_handlep, &ent);
break;
}
case kadm_delete:{
@@ -144,27 +147,21 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
goto fail;
}
ret = krb5_ret_principal(sp, &princ);
if (ret)
goto fail;
krb5_unparse_name_fixed(contextp->context, princ, name, sizeof(name));
krb5_warnx(contextp->context, "%s: %s %s", client, op, name);
if (ret == 0)
ret = krb5_unparse_name_fixed(contextp->context, princ, name, sizeof(name));
if (ret == 0) {
ret = _kadm5_acl_check_permission(contextp, KADM5_PRIV_DELETE, princ);
if (ret)
goto fail;
krb5_warnx(contextp->context, "%s: %s %s (%s)", client, op, name,
ret == 0 ? "granted" : "denied");
}
/*
* There's no need to check that the caller has permission to
* delete the victim principal's aliases.
*/
if (ret == 0)
ret = kadm5_delete_principal(kadm_handlep, princ);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
break;
}
case kadm_create:{
@@ -209,13 +206,7 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
ret = kadm5_create_principal(kadm_handlep, &ent,
mask, password);
kadm5_free_principal_ent(kadm_handlep, &ent);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
break;
}
case kadm_modify:{
@@ -262,13 +253,7 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
}
ret = kadm5_modify_principal(kadm_handlep, &ent, mask);
kadm5_free_principal_ent(kadm_handlep, &ent);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
break;
}
case kadm_prune:{
@@ -293,13 +278,7 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
goto fail;
ret = kadm5_prune_principal(kadm_handlep, princ, kvno);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
break;
}
case kadm_rename:{
@@ -342,13 +321,7 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
goto fail;
ret = kadm5_rename_principal(kadm_handlep, princ, princ2);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(sp, ret);
break;
}
case kadm_chpass:{
@@ -360,19 +333,20 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
goto fail;
}
ret = krb5_ret_principal(sp, &princ);
if (ret)
goto fail;
if (ret == 0)
ret = krb5_ret_string(sp, &password);
if (ret == 0)
ret = krb5_ret_int32(sp, &keepold);
if (ret == HEIM_ERR_EOF)
ret = 0;
if (ret == 0) {
ret = krb5_unparse_name_fixed(contextp->context, princ, name, sizeof(name));
if (ret == 0)
krb5_warnx(contextp->context, "%s: %s %s", client, op, name);
}
if (ret)
goto fail;
ret = krb5_ret_int32(sp, &keepold);
if (ret && ret != HEIM_ERR_EOF)
goto fail;
krb5_unparse_name_fixed(contextp->context, princ, name, sizeof(name));
krb5_warnx(contextp->context, "%s: %s %s", client, op, name);
/*
* Change password requests are subject to ACLs unless the principal is
* changing their own password and the initial ticket flag is set, and
@@ -391,13 +365,7 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
ret = kadm5_chpass_principal_3(kadm_handlep, princ, keepold, 0, NULL,
password);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
break;
}
case kadm_chpass_with_key:{
@@ -411,14 +379,13 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
goto fail;
}
ret = krb5_ret_principal(sp, &princ);
if(ret)
goto fail;
if (ret == 0)
ret = krb5_ret_int32(sp, &n_key_data);
if (ret)
goto fail;
if (ret == 0)
ret = krb5_ret_int32(sp, &keepold);
if (ret && ret != HEIM_ERR_EOF)
if (ret == HEIM_ERR_EOF)
ret = 0;
if (ret)
goto fail;
/* n_key_data will be squeezed into an int16_t below. */
@@ -445,15 +412,16 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
}
}
krb5_unparse_name_fixed(contextp->context, princ, name, sizeof(name));
krb5_warnx(contextp->context, "%s: %s %s", client, op, name);
/*
* The change is only allowed if the user is on the CPW ACL,
* this it to force password quality check on the user.
*/
ret = _kadm5_acl_check_permission(contextp, KADM5_PRIV_CPW, princ);
ret_sp = krb5_unparse_name_fixed(contextp->context, princ, name, sizeof(name));
if (ret_sp == 0)
krb5_warnx(contextp->context, "%s: %s %s (%s)", client, op, name,
ret ? "denied" : "granted");
if(ret) {
int16_t dummy = n_key_data;
@@ -468,13 +436,7 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
kadm5_free_key_data (contextp, &dummy, key_data);
}
free (key_data);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
break;
}
case kadm_randkey:{
@@ -560,18 +522,12 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
&n_keys);
free(ks_tuple);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
if (ret == 0){
krb5_store_int32(sp, n_keys);
ret_sp = krb5_store_int32(rsp, ret);
if (ret == 0 && ret_sp == 0){
ret_sp = krb5_store_int32(rsp, n_keys);
for (i = 0; i < n_keys; i++){
if (ret == 0)
ret = krb5_store_keyblock(sp, new_keys[i]);
if (ret_sp == 0)
ret_sp = krb5_store_keyblock(rsp, new_keys[i]);
krb5_free_keyblock_contents(contextp->context, &new_keys[i]);
}
free(new_keys);
@@ -581,15 +537,8 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
case kadm_get_privs:{
uint32_t privs;
ret = kadm5_get_privs(kadm_handlep, &privs);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
if (ret == 0)
krb5_store_uint32(sp, privs);
ret_sp = krb5_store_uint32(sp, privs);
break;
}
case kadm_get_princs:{
@@ -612,62 +561,42 @@ kadmind_dispatch(void *kadm_handlep, krb5_boolean initial,
}
ret = kadm5_get_principals(kadm_handlep, expression, &princs, &n_princs);
free(expression);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, ret);
ret_sp = krb5_store_int32(rsp, ret);
if (ret == 0) {
int i;
krb5_store_int32(sp, n_princs);
for(i = 0; i < n_princs; i++)
krb5_store_string(sp, princs[i]);
ret_sp = krb5_store_int32(sp, n_princs);
for (i = 0; ret_sp == 0 && i < n_princs; i++)
ret_sp = krb5_store_string(sp, princs[i]);
kadm5_free_name_list(kadm_handlep, princs, &n_princs);
}
break;
}
default:
krb5_warnx(contextp->context, "%s: UNKNOWN OP %d", client, cmd);
krb5_storage_free(sp);
sp = krb5_storage_emem();
if (sp == NULL) {
ret = krb5_enomem(contextp->context);
goto fail;
}
krb5_store_int32(sp, KADM5_FAILURE);
ret_sp = krb5_store_int32(sp, KADM5_FAILURE);
break;
}
if (password != NULL) {
len = strlen(password);
memset_s(password, len, 0, len);
free(password);
}
krb5_storage_to_data(sp, out);
krb5_storage_free(sp);
if (princ != NULL)
krb5_free_principal(contextp->context, princ);
if (princ2 != NULL)
krb5_free_principal(contextp->context, princ2);
return 0;
fail:
if (password != NULL) {
len = strlen(password);
memset_s(password, len, 0, len);
free(password);
}
krb5_warn(contextp->context, ret, "%s", op);
if (sp != NULL) {
krb5_storage_seek(sp, 0, SEEK_SET);
krb5_store_int32(sp, ret);
krb5_storage_to_data(sp, out);
krb5_storage_to_data(rsp, out);
krb5_storage_free(rsp);
krb5_storage_free(sp);
}
if (princ != NULL)
krb5_free_principal(contextp->context, princ);
if (princ2 != NULL)
krb5_free_principal(contextp->context, princ2);
if (ret)
krb5_warn(contextp->context, ret, "%s", op);
if (out->length == 0)
krb5_warn(contextp->context, ret, "%s: reply failed", op);
else if (ret_sp)
krb5_warn(contextp->context, ret, "%s: reply incomplete", op);
if (ret_sp)
return ret_sp;
return 0;
}
@@ -845,7 +774,6 @@ handle_v5(krb5_context contextp,
void *kadm_handlep;
krb5_boolean initial;
krb5_auth_context ac = NULL;
unsigned kadm_version = 1;
kadm5_config_params realm_params;
@@ -853,18 +781,23 @@ handle_v5(krb5_context contextp,
match_appl_version, &kadm_version,
NULL, KRB5_RECVAUTH_IGNORE_VERSION,
keytab, &ticket);
if (ret)
if (ret) {
krb5_err(contextp, 1, ret, "krb5_recvauth");
return;
}
ret = krb5_unparse_name(contextp, ticket->server, &server_name);
if (ret)
if (ret) {
krb5_err(contextp, 1, ret, "krb5_unparse_name");
krb5_free_ticket(contextp, ticket);
return;
}
if (strncmp(server_name, KADM5_ADMIN_SERVICE,
strlen(KADM5_ADMIN_SERVICE)) != 0)
krb5_errx (contextp, 1, "ticket for strange principal (%s)",
server_name);
strlen(KADM5_ADMIN_SERVICE)) != 0) {
krb5_errx(contextp, 1, "ticket for strange principal (%s)", server_name);
krb5_free_ticket(contextp, ticket);
free(server_name);
return;
}
free(server_name);
memset(&realm_params, 0, sizeof(realm_params));
@@ -872,16 +805,27 @@ handle_v5(krb5_context contextp,
if(kadm_version == 1) {
krb5_data params;
ret = krb5_read_priv_message(contextp, ac, &fd, &params);
if(ret)
if (ret) {
krb5_err(contextp, 1, ret, "krb5_read_priv_message");
_kadm5_unmarshal_params(contextp, &params, &realm_params);
krb5_free_ticket(contextp, ticket);
return;
}
ret = _kadm5_unmarshal_params(contextp, &params, &realm_params);
if (ret) {
krb5_err(contextp, 1, ret,
"Could not read or parse kadm5 parameters");
krb5_free_ticket(contextp, ticket);
return;
}
}
initial = ticket->ticket.flags.initial;
ret = krb5_unparse_name(contextp, ticket->client, &client);
if (ret)
krb5_err (contextp, 1, ret, "krb5_unparse_name");
krb5_free_ticket(contextp, ticket);
if (ret) {
krb5_err(contextp, 1, ret, "krb5_unparse_name");
return;
}
ret = kadm5_s_init_with_password_ctx(contextp,
client,
NULL,
@@ -889,8 +833,10 @@ handle_v5(krb5_context contextp,
&realm_params,
0, 0,
&kadm_handlep);
if(ret)
if (ret) {
krb5_err(contextp, 1, ret, "kadm5_init_with_password_ctx");
return;
}
v5_loop(contextp, ac, initial, kadm_handlep, fd, readonly);
}