krb5_child.c revision 951a2082ba1bfe2fec59b06b1f3fdf424d9d75c2
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan/*
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan SSSD
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos Kerberos 5 Backend Module -- tgt_req and changepw child
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos Authors:
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos Sumit Bose <sbose@redhat.com>
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos Copyright (C) 2009-2010 Red Hat
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos This program is free software; you can redistribute it and/or modify
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos it under the terms of the GNU General Public License as published by
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos the Free Software Foundation; either version 3 of the License, or
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos (at your option) any later version.
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos This program is distributed in the hope that it will be useful,
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos but WITHOUT ANY WARRANTY; without even the implied warranty of
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos GNU General Public License for more details.
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos You should have received a copy of the GNU General Public License
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos along with this program. If not, see <http://www.gnu.org/licenses/>.
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos*/
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos
9414015dda290f99570edc01b6dbe98f0f4c49c7Laszlo Hordos#include <sys/types.h>
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan#include <unistd.h>
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan#include <sys/stat.h>
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan#include <popt.h>
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
f469cad18932786e1db610d6134f90b9002181c4jenkins#include <security/pam_modules.h>
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan#include "util/util.h"
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan#include "util/sss_krb5.h"
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos#include "util/user_info_msg.h"
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos#include "util/child_common.h"
935bb442e75e8d04a4eda0aca0cfa24cf4c6af6eLaszlo Hordos#include "providers/dp_backend.h"
e37f4f387b578ba6a967cc9a8b7d79d2ab3508a6omebold#include "providers/krb5/krb5_auth.h"
935bb442e75e8d04a4eda0aca0cfa24cf4c6af6eLaszlo Hordos#include "providers/krb5/krb5_utils.h"
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay#define SSSD_KRB5_CHANGEPW_PRINCIPAL "kadmin/changepw"
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincentstruct krb5_child_ctx {
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay /* opts taken from kinit */
10a9be648c010204b8ba63b283aa177749227e11Paul Bryan /* in seconds */
10a9be648c010204b8ba63b283aa177749227e11Paul Bryan krb5_deltat starttime;
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent krb5_deltat lifetime;
10a9be648c010204b8ba63b283aa177749227e11Paul Bryan krb5_deltat rlife;
b18b5daa8da6584a68cb16eecaa6c4b12ec68fbaBrendan Mmiller
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent int forwardable;
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent int proxiable;
b18b5daa8da6584a68cb16eecaa6c4b12ec68fbaBrendan Mmiller int addresses;
7523c7f44ed55a9882212a3925629e54c1295daePaul Bryan
7523c7f44ed55a9882212a3925629e54c1295daePaul Bryan int not_forwardable;
2ae41f94c30465830758177491494f918a7a79bcLaszlo Hordos int not_proxiable;
7523c7f44ed55a9882212a3925629e54c1295daePaul Bryan int no_addresses;
c843c9cfeb1566e1a4e4ebf0dc019e931dab5182Andi Egloff
621b48669f6acb49c11a34c1e93a0e680a88582aChad Kienle int verbose;
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent
621b48669f6acb49c11a34c1e93a0e680a88582aChad Kienle char* principal_name;
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent char* service_name;
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent char* keytab_name;
100c3de960445a33612602ff02a07eef71963486Phill Cunnington char* k5_cache_name;
e0a79e452974c14e353e70a43b5beb1afba5342fJason Vincent char* k4_cache_name;
93f381e5d31053932f4ffbf07d97b6d8dce32caeJason Vincent
93f381e5d31053932f4ffbf07d97b6d8dce32caeJason Vincent action_type action;
93f381e5d31053932f4ffbf07d97b6d8dce32caeJason Vincent
93f381e5d31053932f4ffbf07d97b6d8dce32caeJason Vincent char *kdcip;
621b48669f6acb49c11a34c1e93a0e680a88582aChad Kienle char *realm;
c843c9cfeb1566e1a4e4ebf0dc019e931dab5182Andi Egloff char *ccache_dir;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos char *ccname_template;
c843c9cfeb1566e1a4e4ebf0dc019e931dab5182Andi Egloff int auth_timeout;
9c8c2c05a3d08f94d29b4a42b8a0506a4e97e4faLaszlo Hordos
9c8c2c05a3d08f94d29b4a42b8a0506a4e97e4faLaszlo Hordos int child_debug_fd;
9c8c2c05a3d08f94d29b4a42b8a0506a4e97e4faLaszlo Hordos};
b7dc48d3b8b0550ab1e178408299bed5185ab4a1Bruno Lavit
9c8c2c05a3d08f94d29b4a42b8a0506a4e97e4faLaszlo Hordosstruct krb5_req {
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos krb5_context ctx;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos krb5_principal princ;
2df9b9c4ff87e7ac55d076945ff1a9922870b4ddAndi Egloff char* name;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos krb5_creds *creds;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos krb5_get_init_creds_opt *options;
2df9b9c4ff87e7ac55d076945ff1a9922870b4ddAndi Egloff pid_t child_pid;
d591ab7a9428501f88bdb3456151ab9018c646e9Laszlo Hordos int read_from_child_fd;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos int write_to_child_fd;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
d591ab7a9428501f88bdb3456151ab9018c646e9Laszlo Hordos struct be_req *req;
904cb62bed9852642ea1d7699cb0515f4f62794aJon Branch struct pam_data *pd;
904cb62bed9852642ea1d7699cb0515f4f62794aJon Branch struct krb5_child_ctx *krb5_ctx;
904cb62bed9852642ea1d7699cb0515f4f62794aJon Branch errno_t (*child_req)(int fd, struct krb5_req *kr);
904cb62bed9852642ea1d7699cb0515f4f62794aJon Branch
904cb62bed9852642ea1d7699cb0515f4f62794aJon Branch char *ccname;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos char *keytab;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos bool validate;
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos char *fast_ccname;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos const char *upn;
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos uid_t uid;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan gid_t gid;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos};
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordosstatic krb5_context krb5_error_ctx;
660a40ad15749d74efa0dd4ef12cb8781c570e22Laszlo Hordos#define KRB5_CHILD_DEBUG(level, error) KRB5_DEBUG(level, krb5_error_ctx, error)
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryanstatic void sss_krb5_expire_callback_func(krb5_context context, void *data,
0bfa6b040942fa10868f2a7c82555652b605a280Travis Hall krb5_timestamp password_expiration,
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos krb5_timestamp account_expiration,
d591ab7a9428501f88bdb3456151ab9018c646e9Laszlo Hordos krb5_boolean is_last_req)
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos{
0bfa6b040942fa10868f2a7c82555652b605a280Travis Hall int ret;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos uint32_t *blob;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos long exp_time;
9c4d05edc8e0887d3aad788027d46d5afedb3ee0Travis Hall struct krb5_req *kr = talloc_get_type(data, struct krb5_req);
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos if (password_expiration == 0) {
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos return;
9c4d05edc8e0887d3aad788027d46d5afedb3ee0Travis Hall }
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos exp_time = password_expiration - time(NULL);
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos if (exp_time < 0 || exp_time > UINT32_MAX) {
b7dc48d3b8b0550ab1e178408299bed5185ab4a1Bruno Lavit DEBUG(1, ("Time to expire out of range.\n"));
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos return;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan }
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos DEBUG(SSSDBG_TRACE_INTERNAL, ("exp_time: [%d]\n", exp_time));
aa26d20912b59f80d1b06b9c0a34c2d4de507a4fLaszlo Hordos
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan blob = talloc_array(kr->pd, uint32_t, 2);
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos if (blob == NULL) {
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos DEBUG(1, ("talloc_size failed.\n"));
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan return;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan }
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos blob[0] = SSS_PAM_USER_INFO_EXPIRE_WARN;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos blob[1] = (uint32_t) exp_time;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, 2 * sizeof(uint32_t),
154001a7695db48f5e59bd2978bf3254210feed4Jason Vincent (uint8_t *) blob);
154001a7695db48f5e59bd2978bf3254210feed4Jason Vincent if (ret != EOK) {
154001a7695db48f5e59bd2978bf3254210feed4Jason Vincent DEBUG(1, ("pam_add_response failed.\n"));
154001a7695db48f5e59bd2978bf3254210feed4Jason Vincent }
154001a7695db48f5e59bd2978bf3254210feed4Jason Vincent
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay return;
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay}
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemaystatic krb5_error_code sss_krb5_prompter(krb5_context context, void *data,
52ac627fd3ec7d31990e454143b1a476284fb3d5Jason Lemay const char *name, const char *banner,
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan int num_prompts, krb5_prompt prompts[])
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan{
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan int ret;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos struct krb5_req *kr = talloc_get_type(data, struct krb5_req);
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos if (num_prompts != 0) {
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos DEBUG(1, ("Cannot handle password prompts.\n"));
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos return KRB5_LIBOS_CANTREADPWD;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos }
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos if (banner == NULL || *banner == '\0') {
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos DEBUG(5, ("Prompter called with empty banner, nothing to do.\n"));
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos return EOK;
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos }
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos DEBUG(SSSDBG_FUNC_DATA, ("Prompter called with [%s].\n", banner));
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos ret = pam_add_response(kr->pd, SSS_PAM_TEXT_MSG, strlen(banner)+1,
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos (const uint8_t *) banner);
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos if (ret != EOK) {
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan DEBUG(1, ("pam_add_response failed.\n"));
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan }
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan return EOK;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan}
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryanstatic krb5_error_code create_empty_cred(krb5_context ctx, krb5_principal princ,
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan krb5_creds **_cred)
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan{
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan krb5_error_code kerr;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan krb5_creds *cred = NULL;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan krb5_data *krb5_realm;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan cred = calloc(sizeof(krb5_creds), 1);
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan if (cred == NULL) {
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan DEBUG(1, ("calloc failed.\n"));
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan return ENOMEM;
fa9b7593e9e156060babbf3a9b06de8d6b5da5a3Laszlo Hordos }
47196c962e3caf7cdf7ea5d00ccdefc9f208bdceLaszlo Hordos
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan kerr = krb5_copy_principal(ctx, princ, &cred->client);
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan if (kerr != 0) {
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan DEBUG(1, ("krb5_copy_principal failed.\n"));
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan goto done;
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan }
d3bd4c99b4d249234086d3e694d9c8fb649dcc3ePaul Bryan
krb5_realm = krb5_princ_realm(ctx, princ);
kerr = krb5_build_principal_ext(ctx, &cred->server,
krb5_realm->length, krb5_realm->data,
KRB5_TGS_NAME_SIZE, KRB5_TGS_NAME,
krb5_realm->length, krb5_realm->data, 0);
if (kerr != 0) {
DEBUG(1, ("krb5_build_principal_ext failed.\n"));
goto done;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("Created empty krb5_creds.\n"));
done:
if (kerr != 0) {
if (cred != NULL && cred->client != NULL) {
krb5_free_principal(ctx, cred->client);
}
free(cred);
} else {
*_cred = cred;
}
return kerr;
}
static krb5_error_code
store_creds_in_ccache(krb5_context ctx, krb5_principal princ,
krb5_ccache cc, krb5_creds *creds)
{
krb5_error_code kerr;
krb5_creds *l_cred;
kerr = krb5_cc_initialize(ctx, cc, princ);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
if (creds == NULL) {
kerr = create_empty_cred(ctx, princ, &l_cred);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
} else {
l_cred = creds;
}
kerr = krb5_cc_store_cred(ctx, cc, l_cred);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
#ifdef HAVE_KRB5_DIRCACHE
kerr = krb5_cc_switch(ctx, cc);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
#endif /* HAVE_KRB5_DIRCACHE */
kerr = krb5_cc_close(ctx, cc);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
done:
return kerr;
}
static krb5_error_code create_ccache_file(krb5_context ctx,
krb5_principal princ,
char *ccname, krb5_creds *creds)
{
krb5_error_code kerr;
krb5_ccache tmp_cc = NULL;
char *cc_file_name;
int fd = -1;
size_t ccname_len;
char *dummy;
char *tmp_ccname;
TALLOC_CTX *tmp_ctx = NULL;
mode_t old_umask;
DEBUG(SSSDBG_FUNC_DATA, ("Creating ccache at [%s]\n", ccname));
if (strncmp(ccname, "FILE:", 5) == 0) {
cc_file_name = ccname + 5;
} else {
cc_file_name = ccname;
}
if (cc_file_name[0] != '/') {
DEBUG(1, ("Ccache filename is not an absolute path.\n"));
return EINVAL;
}
tmp_ctx = talloc_new(tmp_ctx);
if (tmp_ctx == NULL) {
DEBUG(1, ("talloc_new failed.\n"));
return ENOMEM;
}
dummy = strrchr(cc_file_name, '/');
tmp_ccname = talloc_strndup(tmp_ctx, cc_file_name,
(size_t) (dummy-cc_file_name));
if (tmp_ccname == NULL) {
DEBUG(1, ("talloc_strdup failed.\n"));
kerr = ENOMEM;
goto done;
}
tmp_ccname = talloc_asprintf_append(tmp_ccname, "/.krb5cc_dummy_XXXXXX");
if (tmp_ccname == NULL) {
kerr = ENOMEM;
goto done;
}
old_umask = umask(077);
fd = mkstemp(tmp_ccname);
umask(old_umask);
if (fd == -1) {
kerr = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
("mkstemp failed [%d][%s].\n", kerr, strerror(kerr)));
goto done;
}
kerr = krb5_cc_resolve(ctx, tmp_ccname, &tmp_cc);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = store_creds_in_ccache(ctx, princ, tmp_cc, creds);
if (fd != -1) {
close(fd);
fd = -1;
}
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
ccname_len = strlen(cc_file_name);
if (ccname_len >= 6 && strcmp(cc_file_name + (ccname_len-6), "XXXXXX")==0 ) {
fd = mkstemp(cc_file_name);
if (fd == -1) {
kerr = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
("mkstemp failed [%d][%s].\n", kerr, strerror(kerr)));
goto done;
}
}
kerr = rename(tmp_ccname, cc_file_name);
if (kerr == -1) {
kerr = errno;
DEBUG(1, ("rename failed [%d][%s].\n", kerr, strerror(kerr)));
}
DEBUG(SSSDBG_TRACE_LIBS, ("Created ccache file: [%s]\n", ccname));
done:
if (kerr != 0 && tmp_cc != NULL) {
krb5_cc_destroy(ctx, tmp_cc);
}
if (fd != -1) {
close(fd);
}
talloc_free(tmp_ctx);
return kerr;
}
#ifdef HAVE_KRB5_DIRCACHE
static errno_t
create_ccdir(const char *dirname, uid_t uid, gid_t gid)
{
mode_t old_umask;
struct stat statbuf;
errno_t ret;
old_umask = umask(0000);
ret = mkdir(dirname, 0700);
umask(old_umask);
if (ret == -1) {
/* Failing the mkdir is only OK if the directory already
* exists AND it is owned by the same user and group and
* has the correct permissions.
*/
ret = errno;
if (ret == EEXIST) {
errno = 0;
ret = stat(dirname, &statbuf);
if (ret == -1) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
("stat failed [%d]: %s\n", ret, strerror(ret)));
return EIO;
}
if (statbuf.st_uid != uid || statbuf.st_gid != gid) {
DEBUG(SSSDBG_CRIT_FAILURE,
("The directory %s is owned by %d/%d, expected %d/%d\n",
dirname, statbuf.st_uid, statbuf.st_gid, uid, gid));
return EACCES;
}
if ((statbuf.st_mode & ~S_IFMT) != 0700) {
DEBUG(SSSDBG_CRIT_FAILURE,
("The directory %s has wrong permissions %o, expected 0700\n",
dirname, (statbuf.st_mode & ~S_IFMT)));
return EACCES;
}
} else {
DEBUG(SSSDBG_CRIT_FAILURE, ("mkdir [%s] failed [%d]: %s\n",
dirname, ret, strerror(ret)));
return ret;
}
}
return EOK;
}
static krb5_error_code
create_ccache_in_dir(uid_t uid, gid_t gid,
krb5_context ctx,
krb5_principal princ,
char *ccname, krb5_creds *creds)
{
krb5_error_code kerr;
krb5_ccache tmp_cc = NULL;
const char *dirname;
DEBUG(SSSDBG_FUNC_DATA, ("Creating ccache at [%s]\n", ccname));
dirname = sss_krb5_residual_check_type(ccname, SSS_KRB5_TYPE_DIR);
if (dirname == NULL) {
return EIO;
}
kerr = become_user(uid, gid);
if (kerr != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("become_user failed.\n"));
goto done;
}
if (dirname[0] == ':') {
/* Cache name in the form of DIR::filepath represents a single
* ccache in a collection that we are trying to reuse.
* See src/lib/krb5/ccache/cc_dir.c in the MIT Kerberos tree.
*/
kerr = krb5_cc_resolve(ctx, ccname, &tmp_cc);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
} else if (dirname[0] == '/') {
/* An absolute path denotes that krb5_child should create a new
* ccache. We can afford to just call mkdir(dirname) because we
* only want the last component to be created.
*/
kerr = create_ccdir(dirname, uid, gid);
if (kerr) {
DEBUG(SSSDBG_OP_FAILURE,
("Cannot create directory %s\n", dirname));
goto done;
}
kerr = krb5_cc_set_default_name(ctx, ccname);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
kerr = krb5_cc_new_unique(ctx, "DIR", NULL, &tmp_cc);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
} else {
DEBUG(SSSDBG_CRIT_FAILURE,
("Wrong residual format for DIR in ccache %s\n", ccname));
return EIO;
}
kerr = store_creds_in_ccache(ctx, princ, tmp_cc, creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_OP_FAILURE, kerr);
goto done;
}
done:
if (kerr != 0 && tmp_cc != NULL) {
krb5_cc_destroy(ctx, tmp_cc);
}
return kerr;
}
#endif /* HAVE_KRB5_DIRCACHE */
static krb5_error_code
create_ccache(uid_t uid, gid_t gid, krb5_context ctx,
krb5_principal princ, char *ccname, krb5_creds *creds)
{
enum sss_krb5_cc_type cctype;
cctype = sss_krb5_get_type(ccname);
switch (cctype) {
case SSS_KRB5_TYPE_FILE:
return create_ccache_file(ctx, princ, ccname, creds);
#ifdef HAVE_KRB5_DIRCACHE
case SSS_KRB5_TYPE_DIR:
return create_ccache_in_dir(uid, gid, ctx, princ, ccname, creds);
#endif /* HAVE_KRB5_DIRCACHE */
default:
DEBUG(SSSDBG_CRIT_FAILURE, ("Unknown cache type\n"));
return EINVAL;
}
return EINVAL; /* Should never get here */
}
static errno_t pack_response_packet(struct response *resp, int status,
struct pam_data *pd)
{
size_t size = 0;
size_t p = 0;
struct response_data *pdr;
/* A buffer with the following structure must be created:
* int32_t status of the request (required)
* message (zero or more)
*
* A message consists of:
* int32_t type of the message
* int32_t length of the following data
* uint8_t[len] data
*/
size = sizeof(int32_t);
pdr = pd->resp_list;
while (pdr != NULL) {
size += 2*sizeof(int32_t) + pdr->len;
pdr = pdr->next;
}
resp->buf = talloc_array(resp, uint8_t, size);
if (!resp->buf) {
DEBUG(1, ("Insufficient memory to create message.\n"));
return ENOMEM;
}
SAFEALIGN_SET_INT32(&resp->buf[p], status, &p);
pdr = pd->resp_list;
while(pdr != NULL) {
SAFEALIGN_SET_INT32(&resp->buf[p], pdr->type, &p);
SAFEALIGN_SET_INT32(&resp->buf[p], pdr->len, &p);
safealign_memcpy(&resp->buf[p], pdr->data, pdr->len, &p);
pdr = pdr->next;
}
resp->size = p;
DEBUG(SSSDBG_TRACE_INTERNAL, ("response packet size: [%d]\n", p));
return EOK;
}
static struct response *prepare_response_message(struct krb5_req *kr,
krb5_error_code kerr,
int pam_status)
{
char *msg = NULL;
const char *krb5_msg = NULL;
int ret;
struct response *resp;
resp = talloc_zero(kr, struct response);
if (resp == NULL) {
DEBUG(1, ("Initializing response failed.\n"));
return NULL;
}
DEBUG(SSSDBG_TRACE_FUNC, ("Building response for result [%d]\n", kerr));
if (kerr == 0) {
if (kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM) {
pam_status = PAM_SUCCESS;
ret = EOK;
} else if (kr->pd->cmd == SSS_PAM_ACCT_MGMT) {
ret = EOK;
} else {
if (kr->ccname == NULL) {
DEBUG(1, ("Error obtaining ccname.\n"));
return NULL;
}
msg = talloc_asprintf(kr, "%s=%s",CCACHE_ENV_NAME, kr->ccname);
if (msg == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
return NULL;
}
pam_status = PAM_SUCCESS;
ret = pam_add_response(kr->pd, SSS_PAM_ENV_ITEM, strlen(msg) + 1,
(uint8_t *) msg);
talloc_zfree(msg);
}
} else {
krb5_msg = sss_krb5_get_error_message(krb5_error_ctx, kerr);
if (krb5_msg == NULL) {
DEBUG(1, ("sss_krb5_get_error_message failed.\n"));
return NULL;
}
ret = pam_add_response(kr->pd, SSS_PAM_SYSTEM_INFO,
strlen(krb5_msg) + 1,
(const uint8_t *) krb5_msg);
sss_krb5_free_error_message(krb5_error_ctx, krb5_msg);
}
if (ret != EOK) {
DEBUG(1, ("pam_add_response failed.\n"));
}
ret = pack_response_packet(resp, pam_status, kr->pd);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
return NULL;
}
return resp;
}
static errno_t sendresponse(int fd, krb5_error_code kerr, int pam_status,
struct krb5_req *kr)
{
struct response *resp;
size_t written;
int ret;
resp = prepare_response_message(kr, kerr, pam_status);
if (resp == NULL) {
DEBUG(1, ("prepare_response_message failed.\n"));
return ENOMEM;
}
errno = 0;
written = sss_atomic_write_s(fd, resp->buf, resp->size);
if (written == -1) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
("write failed [%d][%s].\n", ret, strerror(ret)));
return ret;
}
if (written != resp->size) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Write error, wrote [%d] bytes, expected [%d]\n",
written, resp->size));
return EOK;
}
DEBUG(SSSDBG_TRACE_ALL, ("Response sent.\n"));
return EOK;
}
static errno_t add_ticket_times_to_response(struct krb5_req *kr)
{
int ret;
int64_t t[4];
t[0] = (int64_t) kr->creds->times.authtime;
t[1] = (int64_t) kr->creds->times.starttime;
t[2] = (int64_t) kr->creds->times.endtime;
t[3] = (int64_t) kr->creds->times.renew_till;
ret = pam_add_response(kr->pd, SSS_KRB5_INFO_TGT_LIFETIME,
4*sizeof(int64_t), (uint8_t *) t);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
}
return ret;
}
static krb5_error_code validate_tgt(struct krb5_req *kr)
{
krb5_error_code kerr;
krb5_error_code kt_err;
char *principal = NULL;
krb5_keytab keytab;
krb5_kt_cursor cursor;
krb5_keytab_entry entry;
krb5_verify_init_creds_opt opt;
memset(&keytab, 0, sizeof(keytab));
kerr = krb5_kt_resolve(kr->ctx, kr->keytab, &keytab);
if (kerr != 0) {
DEBUG(1, ("error resolving keytab [%s], not verifying TGT.\n",
kr->keytab));
return kerr;
}
memset(&cursor, 0, sizeof(cursor));
kerr = krb5_kt_start_seq_get(kr->ctx, keytab, &cursor);
if (kerr != 0) {
DEBUG(1, ("error reading keytab [%s], not verifying TGT.\n",
kr->keytab));
return kerr;
}
/* We look for the first entry from our realm or take the last one */
memset(&entry, 0, sizeof(entry));
while ((kt_err = krb5_kt_next_entry(kr->ctx, keytab, &entry, &cursor)) == 0) {
if (krb5_realm_compare(kr->ctx, entry.principal, kr->princ)) {
DEBUG(SSSDBG_TRACE_INTERNAL,
("Found keytab entry with the realm of the credential.\n"));
break;
}
kerr = sss_krb5_free_keytab_entry_contents(kr->ctx, &entry);
if (kerr != 0) {
DEBUG(1, ("Failed to free keytab entry.\n"));
}
memset(&entry, 0, sizeof(entry));
}
/* Close the keytab here. Even though we're using cursors, the file
* handle is stored in the krb5_keytab structure, and it gets
* overwritten when the verify_init_creds() call below creates its own
* cursor, creating a leak. */
kerr = krb5_kt_end_seq_get(kr->ctx, keytab, &cursor);
if (kerr != 0) {
DEBUG(1, ("krb5_kt_end_seq_get failed, not verifying TGT.\n"));
goto done;
}
/* check if we got any errors from krb5_kt_next_entry */
if (kt_err != 0 && kt_err != KRB5_KT_END) {
DEBUG(1, ("error reading keytab [%s], not verifying TGT.\n",
kr->keytab));
goto done;
}
/* Get the principal to which the key belongs, for logging purposes. */
principal = NULL;
kerr = krb5_unparse_name(kr->ctx, entry.principal, &principal);
if (kerr != 0) {
DEBUG(1, ("internal error parsing principal name, "
"not verifying TGT.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
krb5_verify_init_creds_opt_init(&opt);
kerr = krb5_verify_init_creds(kr->ctx, kr->creds, entry.principal, keytab,
NULL, &opt);
if (kerr == 0) {
DEBUG(5, ("TGT verified using key for [%s].\n", principal));
} else {
DEBUG(1 ,("TGT failed verification using key for [%s].\n", principal));
}
done:
if (krb5_kt_close(kr->ctx, keytab) != 0) {
DEBUG(1, ("krb5_kt_close failed"));
}
if (sss_krb5_free_keytab_entry_contents(kr->ctx, &entry) != 0) {
DEBUG(1, ("Failed to free keytab entry.\n"));
}
if (principal != NULL) {
sss_krb5_free_unparsed_name(kr->ctx, principal);
}
return kerr;
}
static void krb5_set_canonicalize(krb5_get_init_creds_opt *opts)
{
int canonicalize = 0;
char *tmp_str;
tmp_str = getenv(SSSD_KRB5_CANONICALIZE);
if (tmp_str != NULL && strcasecmp(tmp_str, "true") == 0) {
canonicalize = 1;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_CANONICALIZE, tmp_str ? tmp_str : "not set"));
sss_krb5_get_init_creds_opt_set_canonicalize(opts, canonicalize);
}
static krb5_error_code get_and_save_tgt_with_keytab(krb5_context ctx,
krb5_principal princ,
krb5_keytab keytab,
char *ccname)
{
krb5_error_code kerr = 0;
krb5_creds creds;
krb5_get_init_creds_opt options;
memset(&creds, 0, sizeof(creds));
memset(&options, 0, sizeof(options));
krb5_get_init_creds_opt_set_address_list(&options, NULL);
krb5_get_init_creds_opt_set_forwardable(&options, 0);
krb5_get_init_creds_opt_set_proxiable(&options, 0);
krb5_set_canonicalize(&options);
kerr = krb5_get_init_creds_keytab(ctx, &creds, princ, keytab, 0, NULL,
&options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
/* Use the updated principal in the creds in case canonicalized */
kerr = create_ccache_file(ctx, creds.client, ccname, &creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = 0;
done:
krb5_free_cred_contents(ctx, &creds);
return kerr;
}
static krb5_error_code get_and_save_tgt(struct krb5_req *kr,
char *password)
{
krb5_error_code kerr = 0;
int ret;
const char *realm_name;
int realm_length;
kerr = sss_krb5_get_init_creds_opt_set_expire_callback(kr->ctx, kr->options,
sss_krb5_expire_callback_func,
kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
DEBUG(1, ("Failed to set expire callback, continue without.\n"));
}
sss_krb5_princ_realm(kr->ctx, kr->princ, &realm_name, &realm_length);
DEBUG(SSSDBG_TRACE_FUNC,
("Attempting kinit for realm [%s]\n",realm_name));
kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
password, sss_krb5_prompter, kr, 0,
NULL, kr->options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
if (kr->validate) {
kerr = validate_tgt(kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
} else {
DEBUG(SSSDBG_CONF_SETTINGS, ("TGT validation is disabled.\n"));
}
if (kr->validate || kr->fast_ccname != NULL) {
/* We drop root privileges which were needed to read the keytab file
* for the validation of the credentials or for FAST here to run the
* ccache I/O operations with user privileges. */
ret = become_user(kr->uid, kr->gid);
if (ret != EOK) {
DEBUG(1, ("become_user failed.\n"));
return ret;
}
}
/* Use the updated principal in the creds in case canonicalized */
kerr = create_ccache(kr->uid, kr->gid, kr->ctx,
kr->creds ? kr->creds->client : kr->princ,
kr->ccname, kr->creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
ret = add_ticket_times_to_response(kr);
if (ret != EOK) {
DEBUG(1, ("add_ticket_times_to_response failed.\n"));
}
kerr = 0;
done:
krb5_free_cred_contents(kr->ctx, kr->creds);
return kerr;
}
static errno_t changepw_child(int fd, struct krb5_req *kr)
{
int ret;
krb5_error_code kerr = 0;
char *pass_str = NULL;
char *newpass_str = NULL;
int pam_status = PAM_SYSTEM_ERR;
int result_code = -1;
krb5_data result_code_string;
krb5_data result_string;
char *user_error_message = NULL;
size_t user_resp_len;
uint8_t *user_resp;
char *changepw_princ = NULL;
krb5_prompter_fct prompter = sss_krb5_prompter;
const char *realm_name;
int realm_length;
DEBUG(SSSDBG_TRACE_LIBS, ("Password change operation\n"));
if (kr->pd->authtok_type != SSS_AUTHTOK_TYPE_PASSWORD) {
pam_status = PAM_CRED_INSUFFICIENT;
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
pass_str = talloc_strndup(kr, (const char *) kr->pd->authtok,
kr->pd->authtok_size);
if (pass_str == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
changepw_princ = talloc_asprintf(kr, "%s@%s", SSSD_KRB5_CHANGEPW_PRINCIPAL,
kr->krb5_ctx->realm);
if (changepw_princ == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
DEBUG(SSSDBG_FUNC_DATA,
("Created a changepw principal [%s]\n", changepw_princ));
if (kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM) {
/* We do not need a password expiration warning here. */
prompter = NULL;
}
sss_krb5_princ_realm(kr->ctx, kr->princ, &realm_name, &realm_length);
DEBUG(SSSDBG_TRACE_FUNC,
("Attempting kinit for realm [%s]\n",realm_name));
kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
pass_str, prompter, kr, 0,
changepw_princ,
kr->options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
if (kerr == KRB5_KDC_UNREACH) {
pam_status = PAM_AUTHINFO_UNAVAIL;
}
goto sendresponse;
}
memset(pass_str, 0, kr->pd->authtok_size);
talloc_zfree(pass_str);
memset(kr->pd->authtok, 0, kr->pd->authtok_size);
if (kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM) {
DEBUG(SSSDBG_TRACE_LIBS,
("Initial authentication for change password operation "
"successful.\n"));
krb5_free_cred_contents(kr->ctx, kr->creds);
pam_status = PAM_SUCCESS;
goto sendresponse;
}
newpass_str = talloc_strndup(kr, (const char *) kr->pd->newauthtok,
kr->pd->newauthtok_size);
if (newpass_str == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
memset(&result_code_string, 0, sizeof(krb5_data));
memset(&result_string, 0, sizeof(krb5_data));
kerr = krb5_change_password(kr->ctx, kr->creds, newpass_str, &result_code,
&result_code_string, &result_string);
if (kerr == KRB5_KDC_UNREACH) {
pam_status = PAM_AUTHTOK_LOCK_BUSY;
goto sendresponse;
}
if (kerr != 0 || result_code != 0) {
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
} else {
kerr = KRB5KRB_ERR_GENERIC;
}
if (result_code_string.length > 0) {
DEBUG(1, ("krb5_change_password failed [%d][%.*s].\n", result_code,
result_code_string.length, result_code_string.data));
user_error_message = talloc_strndup(kr->pd, result_code_string.data,
result_code_string.length);
if (user_error_message == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
}
}
if (result_string.length > 0) {
DEBUG(1, ("krb5_change_password failed [%d][%.*s].\n", result_code,
result_string.length, result_string.data));
talloc_free(user_error_message);
user_error_message = talloc_strndup(kr->pd, result_string.data,
result_string.length);
if (user_error_message == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
}
}
if (user_error_message != NULL) {
ret = pack_user_info_chpass_error(kr->pd, user_error_message,
&user_resp_len, &user_resp);
if (ret != EOK) {
DEBUG(1, ("pack_user_info_chpass_error failed.\n"));
} else {
ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, user_resp_len,
user_resp);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
}
}
}
pam_status = PAM_AUTHTOK_ERR;
goto sendresponse;
}
krb5_free_cred_contents(kr->ctx, kr->creds);
kerr = get_and_save_tgt(kr, newpass_str);
memset(newpass_str, 0, kr->pd->newauthtok_size);
talloc_zfree(newpass_str);
memset(kr->pd->newauthtok, 0, kr->pd->newauthtok_size);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
if (kerr == KRB5_KDC_UNREACH) {
pam_status = PAM_AUTHINFO_UNAVAIL;
}
}
sendresponse:
ret = sendresponse(fd, kerr, pam_status, kr);
if (ret != EOK) {
DEBUG(1, ("sendresponse failed.\n"));
}
return ret;
}
static errno_t tgt_req_child(int fd, struct krb5_req *kr)
{
int ret;
krb5_error_code kerr = 0;
char *pass_str = NULL;
char *changepw_princ = NULL;
int pam_status = PAM_SYSTEM_ERR;
DEBUG(SSSDBG_TRACE_LIBS, ("Attempting to get a TGT\n"));
if (kr->pd->authtok_type != SSS_AUTHTOK_TYPE_PASSWORD) {
DEBUG(SSSDBG_OP_FAILURE, ("Unknown authtok type\n"));
pam_status = PAM_CRED_INSUFFICIENT;
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
pass_str = talloc_strndup(kr, (const char *) kr->pd->authtok,
kr->pd->authtok_size);
if (pass_str == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
changepw_princ = talloc_asprintf(kr, "%s@%s", SSSD_KRB5_CHANGEPW_PRINCIPAL,
kr->krb5_ctx->realm);
if (changepw_princ == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
kerr = KRB5KRB_ERR_GENERIC;
goto sendresponse;
}
DEBUG(SSSDBG_FUNC_DATA,
("Created a changepw principal [%s]\n", changepw_princ));
kerr = get_and_save_tgt(kr, pass_str);
/* If the password is expired the KDC will always return
KRB5KDC_ERR_KEY_EXP regardless if the supplied password is correct or
not. In general the password can still be used to get a changepw ticket.
So we validate the password by trying to get a changepw ticket. */
if (kerr == KRB5KDC_ERR_KEY_EXP) {
DEBUG(SSSDBG_TRACE_LIBS, ("Password was expired\n"));
kerr = sss_krb5_get_init_creds_opt_set_expire_callback(kr->ctx,
kr->options,
NULL, NULL);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
DEBUG(1, ("Failed to unset expire callback, continue ...\n"));
}
kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
pass_str, sss_krb5_prompter, kr, 0,
changepw_princ,
kr->options);
krb5_free_cred_contents(kr->ctx, kr->creds);
if (kerr == 0) {
kerr = KRB5KDC_ERR_KEY_EXP;
}
}
memset(pass_str, 0, kr->pd->authtok_size);
talloc_zfree(pass_str);
memset(kr->pd->authtok, 0, kr->pd->authtok_size);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
switch (kerr) {
case KRB5_KDC_UNREACH:
pam_status = PAM_AUTHINFO_UNAVAIL;
break;
case KRB5KDC_ERR_KEY_EXP:
pam_status = PAM_NEW_AUTHTOK_REQD;
break;
case KRB5KDC_ERR_PREAUTH_FAILED:
pam_status = PAM_CRED_ERR;
break;
default:
pam_status = PAM_SYSTEM_ERR;
}
}
sendresponse:
ret = sendresponse(fd, kerr, pam_status, kr);
if (ret != EOK) {
DEBUG(1, ("sendresponse failed.\n"));
}
return ret;
}
static errno_t kuserok_child(int fd, struct krb5_req *kr)
{
krb5_boolean access_allowed;
int status;
int ret;
krb5_error_code kerr;
DEBUG(SSSDBG_TRACE_LIBS, ("Verifying if principal can log in as user\n"));
/* krb5_kuserok tries to verify that kr->pd->user is a locally known
* account, so we have to unset _SSS_LOOPS to make getpwnam() work. */
ret = unsetenv("_SSS_LOOPS");
if (ret != EOK) {
DEBUG(1, ("Failed to unset _SSS_LOOPS, "
"krb5_kuserok will most certainly fail.\n"));
}
kerr = krb5_set_default_realm(kr->ctx, kr->krb5_ctx->realm);
if (kerr != 0) {
DEBUG(1, ("krb5_set_default_realm failed, "
"krb5_kuserok may fail.\n"));
}
access_allowed = krb5_kuserok(kr->ctx, kr->princ, kr->pd->user);
DEBUG(SSSDBG_TRACE_LIBS,
("Access was %s\n", access_allowed ? "allowed" : "denied"));
status = access_allowed ? 0 : 1;
ret = sendresponse(fd, 0, status, kr);
if (ret != EOK) {
DEBUG(1, ("sendresponse failed.\n"));
}
return ret;
}
static errno_t renew_tgt_child(int fd, struct krb5_req *kr)
{
int ret;
int status = PAM_AUTHTOK_ERR;
int kerr;
char *ccname;
krb5_ccache ccache = NULL;
DEBUG(SSSDBG_TRACE_LIBS, ("Renewing a ticket\n"));
if (kr->pd->authtok_type != SSS_AUTHTOK_TYPE_CCFILE) {
DEBUG(1, ("Unsupported authtok type for TGT renewal [%d].\n",
kr->pd->authtok_type));
kerr = EINVAL;
goto done;
}
ccname = talloc_strndup(kr, (char *) kr->pd->authtok, kr->pd->authtok_size);
if (ccname == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
kerr = ENOMEM;
goto done;
}
kerr = krb5_cc_resolve(kr->ctx, ccname, &ccache);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = krb5_get_renewed_creds(kr->ctx, kr->creds, kr->princ, ccache, NULL);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
if (kerr == KRB5_KDC_UNREACH) {
status = PAM_AUTHINFO_UNAVAIL;
DEBUG(SSSDBG_TRACE_ALL, ("kdc unreachable for renewed creds.\n"));
}
goto done;
}
if (kr->validate) {
kerr = validate_tgt(kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
} else {
DEBUG(SSSDBG_CONF_SETTINGS, ("TGT validation is disabled.\n"));
}
if (kr->validate || kr->fast_ccname != NULL) {
/* We drop root privileges which were needed to read the keytab file
* for the validation of the credentials or for FAST here to run the
* ccache I/O operations with user privileges. */
ret = become_user(kr->uid, kr->gid);
if (ret != EOK) {
DEBUG(1, ("become_user failed.\n"));
kerr = ret;
goto done;
}
}
kerr = krb5_cc_initialize(kr->ctx, ccache, kr->princ);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = krb5_cc_store_cred(kr->ctx, ccache, kr->creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
ret = add_ticket_times_to_response(kr);
if (ret != EOK) {
DEBUG(1, ("add_ticket_times_to_response failed.\n"));
}
status = PAM_SUCCESS;
kerr = 0;
done:
krb5_free_cred_contents(kr->ctx, kr->creds);
if (ccache != NULL) {
krb5_cc_close(kr->ctx, ccache);
}
ret = sendresponse(fd, kerr, status, kr);
if (ret != EOK) {
DEBUG(1, ("sendresponse failed.\n"));
}
return ret;
}
static errno_t create_empty_ccache(int fd, struct krb5_req *kr)
{
int ret;
int pam_status = PAM_SUCCESS;
DEBUG(SSSDBG_TRACE_LIBS, ("Creating empty ccache\n"));
ret = create_ccache(kr->uid, kr->gid, kr->ctx,
kr->princ, kr->ccname, NULL);
if (ret != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, ret);
pam_status = PAM_SYSTEM_ERR;
}
ret = sendresponse(fd, ret, pam_status, kr);
if (ret != EOK) {
DEBUG(1, ("sendresponse failed.\n"));
}
return ret;
}
static errno_t unpack_buffer(uint8_t *buf, size_t size, struct pam_data *pd,
struct krb5_req *kr, uint32_t *offline)
{
size_t p = 0;
uint32_t len;
uint32_t validate;
DEBUG(SSSDBG_TRACE_LIBS, ("total buffer size: [%d]\n", size));
if (!offline || !kr) return EINVAL;
SAFEALIGN_COPY_UINT32_CHECK(&pd->cmd, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&kr->uid, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&kr->gid, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&validate, buf + p, size, &p);
kr->validate = (validate == 0) ? false : true;
SAFEALIGN_COPY_UINT32_CHECK(offline, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
kr->upn = talloc_strndup(pd, (char *)(buf + p), len);
if (kr->upn == NULL) return ENOMEM;
p += len;
DEBUG(SSSDBG_CONF_SETTINGS,
("cmd [%d] uid [%llu] gid [%llu] validate [%s] offline [%s] "
"UPN [%s]\n", pd->cmd, kr->uid, kr->gid,
kr->validate ? "true" : "false", *offline ? "true" : "false",
kr->upn ? kr->upn : "none"));
if (pd->cmd == SSS_PAM_AUTHENTICATE ||
pd->cmd == SSS_CMD_RENEW ||
pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM || pd->cmd == SSS_PAM_CHAUTHTOK) {
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
kr->ccname = talloc_strndup(pd, (char *)(buf + p), len);
if (kr->ccname == NULL) return ENOMEM;
p += len;
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
kr->keytab = talloc_strndup(pd, (char *)(buf + p), len);
if (kr->keytab == NULL) return ENOMEM;
p += len;
SAFEALIGN_COPY_UINT32_CHECK(&pd->authtok_type, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len) > size) return EINVAL;
pd->authtok = (uint8_t *)talloc_strndup(pd, (char *)(buf + p), len);
if (pd->authtok == NULL) return ENOMEM;
pd->authtok_size = len + 1;
p += len;
DEBUG(SSSDBG_CONF_SETTINGS, ("ccname: [%s] keytab: [%s]\n",
kr->ccname, kr->keytab));
} else {
kr->ccname = NULL;
kr->keytab = NULL;
pd->authtok = NULL;
pd->authtok_size = 0;
}
if (pd->cmd == SSS_PAM_CHAUTHTOK) {
SAFEALIGN_COPY_UINT32_CHECK(&pd->newauthtok_type, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len) > size) return EINVAL;
pd->newauthtok = (uint8_t *)talloc_strndup(pd, (char *)(buf + p), len);
if (pd->newauthtok == NULL) return ENOMEM;
pd->newauthtok_size = len + 1;
p += len;
} else {
pd->newauthtok = NULL;
pd->newauthtok_size = 0;
}
if (pd->cmd == SSS_PAM_ACCT_MGMT) {
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
pd->user = talloc_strndup(pd, (char *)(buf + p), len);
if (pd->user == NULL) return ENOMEM;
p += len;
DEBUG(SSSDBG_CONF_SETTINGS, ("user: [%s]\n", pd->user));
} else {
pd->user = NULL;
}
return EOK;
}
static int krb5_cleanup(void *ptr)
{
struct krb5_req *kr = talloc_get_type(ptr, struct krb5_req);
if (kr == NULL) return EOK;
if (kr->options != NULL) {
sss_krb5_get_init_creds_opt_free(kr->ctx, kr->options);
}
if (kr->creds != NULL) {
krb5_free_cred_contents(kr->ctx, kr->creds);
krb5_free_creds(kr->ctx, kr->creds);
}
if (kr->name != NULL)
sss_krb5_free_unparsed_name(kr->ctx, kr->name);
if (kr->princ != NULL)
krb5_free_principal(kr->ctx, kr->princ);
if (kr->ctx != NULL)
krb5_free_context(kr->ctx);
if (kr->krb5_ctx != NULL) {
memset(kr->krb5_ctx, 0, sizeof(struct krb5_child_ctx));
}
memset(kr, 0, sizeof(struct krb5_req));
return EOK;
}
static krb5_error_code get_tgt_times(krb5_context ctx, const char *ccname,
krb5_principal server_principal,
krb5_principal client_principal,
sss_krb5_ticket_times *tgtt)
{
krb5_error_code krberr;
krb5_ccache ccache = NULL;
krb5_creds mcred;
krb5_creds cred;
krberr = krb5_cc_resolve(ctx, ccname, &ccache);
if (krberr != 0) {
DEBUG(1, ("krb5_cc_resolve failed.\n"));
goto done;
}
memset(&mcred, 0, sizeof(mcred));
memset(&cred, 0, sizeof(mcred));
mcred.server = server_principal;
mcred.client = client_principal;
krberr = krb5_cc_retrieve_cred(ctx, ccache, 0, &mcred, &cred);
if (krberr != 0) {
DEBUG(1, ("krb5_cc_retrieve_cred failed.\n"));
krberr = 0;
goto done;
}
tgtt->authtime = cred.times.authtime;
tgtt->starttime = cred.times.starttime;
tgtt->endtime = cred.times.endtime;
tgtt->renew_till = cred.times.renew_till;
krb5_free_cred_contents(ctx, &cred);
krberr = 0;
done:
if (ccache != NULL) {
krb5_cc_close(ctx, ccache);
}
return krberr;
}
static krb5_error_code check_fast_ccache(krb5_context ctx, const char *primary,
const char *realm,
const char *keytab_name,
TALLOC_CTX *mem_ctx,
char **fast_ccname)
{
TALLOC_CTX *tmp_ctx = NULL;
krb5_error_code kerr;
char *ccname;
char *server_name;
sss_krb5_ticket_times tgtt;
krb5_keytab keytab = NULL;
krb5_principal client_princ = NULL;
krb5_principal server_princ = NULL;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(1, ("talloc_new failed.\n"));
kerr = ENOMEM;
goto done;
}
ccname = talloc_asprintf(tmp_ctx, "FILE:%s/fast_ccache_%s", DB_PATH, realm);
if (ccname == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
kerr = ENOMEM;
goto done;
}
if (keytab_name != NULL) {
kerr = krb5_kt_resolve(ctx, keytab_name, &keytab);
} else {
kerr = krb5_kt_default(ctx, &keytab);
}
if (kerr) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Failed to read keytab file [%s]: %s\n",
KEYTAB_CLEAN_NAME,
sss_krb5_get_error_message(ctx, kerr)));
goto done;
}
kerr = find_principal_in_keytab(ctx, keytab, primary, realm, &client_princ);
if (kerr != 0) {
DEBUG(SSSDBG_MINOR_FAILURE,
("find_principal_in_keytab failed for principal %s@%s.\n",
primary, realm));
goto done;
}
server_name = talloc_asprintf(tmp_ctx, "krbtgt/%s@%s", realm, realm);
if (server_name == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
kerr = ENOMEM;
goto done;
}
kerr = krb5_parse_name(ctx, server_name, &server_princ);
if (kerr != 0) {
DEBUG(1, ("krb5_parse_name failed.\n"));
goto done;
}
memset(&tgtt, 0, sizeof(tgtt));
kerr = get_tgt_times(ctx, ccname, server_princ, client_princ, &tgtt);
if (kerr == 0) {
if (tgtt.endtime > time(NULL)) {
DEBUG(5, ("FAST TGT is still valid.\n"));
goto done;
}
}
kerr = get_and_save_tgt_with_keytab(ctx, client_princ, keytab, ccname);
if (kerr != 0) {
DEBUG(1, ("get_and_save_tgt_with_keytab failed.\n"));
goto done;
}
kerr = 0;
done:
if (client_princ != NULL) {
krb5_free_principal(ctx, client_princ);
}
if (server_princ != NULL) {
krb5_free_principal(ctx, server_princ);
}
if (kerr == 0) {
*fast_ccname = talloc_steal(mem_ctx, ccname);
}
talloc_free(tmp_ctx);
if (keytab != NULL) {
krb5_kt_close(ctx, keytab);
}
return kerr;
}
static int krb5_child_setup(struct krb5_req *kr, uint32_t offline)
{
krb5_error_code kerr = 0;
char *lifetime_str;
char *use_fast_str;
char *tmp_str;
krb5_data *realm_data;
krb5_principal fast_princ_struct;
char *fast_principal = NULL;
const char *fast_principal_realm = NULL;
krb5_deltat lifetime;
kr->krb5_ctx = talloc_zero(kr, struct krb5_child_ctx);
if (kr->krb5_ctx == NULL) {
DEBUG(1, ("talloc failed.\n"));
kerr = ENOMEM;
goto failed;
}
kr->krb5_ctx->realm = getenv(SSSD_KRB5_REALM);
if (kr->krb5_ctx->realm == NULL) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Cannot read [%s] from environment.\n", SSSD_KRB5_REALM));
}
switch(kr->pd->cmd) {
case SSS_PAM_AUTHENTICATE:
/* If we are offline, we need to create an empty ccache file */
if (offline) {
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform offline auth\n"));
kr->child_req = create_empty_ccache;
} else {
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform online auth\n"));
kr->child_req = tgt_req_child;
}
break;
case SSS_PAM_CHAUTHTOK:
case SSS_PAM_CHAUTHTOK_PRELIM:
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform password change\n"));
kr->child_req = changepw_child;
break;
case SSS_PAM_ACCT_MGMT:
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform account management\n"));
kr->child_req = kuserok_child;
break;
case SSS_CMD_RENEW:
if (!offline) {
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform ticket renewal\n"));
kr->child_req = renew_tgt_child;
} else {
DEBUG(1, ("Cannot renew TGT while offline.\n"));
kerr = KRB5_KDC_UNREACH;
goto failed;
}
break;
default:
DEBUG(1, ("PAM command [%d] not supported.\n", kr->pd->cmd));
kerr = EINVAL;
goto failed;
}
kerr = krb5_init_context(&kr->ctx);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
krb5_error_ctx = kr->ctx;
kerr = krb5_parse_name(kr->ctx, kr->upn, &kr->princ);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
kerr = krb5_unparse_name(kr->ctx, kr->princ, &kr->name);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
kr->creds = calloc(1, sizeof(krb5_creds));
if (kr->creds == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
kerr = ENOMEM;
goto failed;
}
kerr = sss_krb5_get_init_creds_opt_alloc(kr->ctx, &kr->options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_CHANGE_PASSWORD_PROMPT
/* A prompter is used to catch messages about when a password will
* expired. The library shall not use the prompter to ask for a new password
* but shall return KRB5KDC_ERR_KEY_EXP. */
krb5_get_init_creds_opt_set_change_password_prompt(kr->options, 0);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
#endif
lifetime_str = getenv(SSSD_KRB5_RENEWABLE_LIFETIME);
if (lifetime_str == NULL) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Cannot read [%s] from environment.\n",
SSSD_KRB5_RENEWABLE_LIFETIME));
} else {
kerr = krb5_string_to_deltat(lifetime_str, &lifetime);
if (kerr != 0) {
DEBUG(1, ("krb5_string_to_deltat failed for [%s].\n",
lifetime_str));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_RENEWABLE_LIFETIME, lifetime_str));
krb5_get_init_creds_opt_set_renew_life(kr->options, lifetime);
}
lifetime_str = getenv(SSSD_KRB5_LIFETIME);
if (lifetime_str == NULL) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Cannot read [%s] from environment.\n",
SSSD_KRB5_LIFETIME));
} else {
kerr = krb5_string_to_deltat(lifetime_str, &lifetime);
if (kerr != 0) {
DEBUG(1, ("krb5_string_to_deltat failed for [%s].\n",
lifetime_str));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
DEBUG(SSSDBG_CONF_SETTINGS,
("%s is set to [%s]\n", SSSD_KRB5_LIFETIME, lifetime_str));
krb5_get_init_creds_opt_set_tkt_life(kr->options, lifetime);
}
if (!offline) {
krb5_set_canonicalize(kr->options);
use_fast_str = getenv(SSSD_KRB5_USE_FAST);
if (use_fast_str == NULL || strcasecmp(use_fast_str, "never") == 0) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Not using FAST.\n"));
} else if (strcasecmp(use_fast_str, "try") == 0 ||
strcasecmp(use_fast_str, "demand") == 0) {
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_LIFETIME, lifetime_str));
tmp_str = getenv(SSSD_KRB5_FAST_PRINCIPAL);
if (!tmp_str) {
fast_principal = NULL;
fast_principal_realm = kr->krb5_ctx->realm;
} else {
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_FAST_PRINCIPAL, lifetime_str));
kerr = krb5_parse_name(kr->ctx, tmp_str, &fast_princ_struct);
if (kerr) {
DEBUG(1, ("krb5_parse_name failed.\n"));
goto failed;
}
kerr = sss_krb5_unparse_name_flags(kr->ctx, fast_princ_struct,
KRB5_PRINCIPAL_UNPARSE_NO_REALM,
&tmp_str);
if (kerr) {
DEBUG(1, ("sss_krb5_unparse_name_flags failed.\n"));
goto failed;
}
fast_principal = talloc_strdup(kr, tmp_str);
if (!fast_principal) {
DEBUG(1, ("talloc_strdup failed.\n"));
kerr = KRB5KRB_ERR_GENERIC;
goto failed;
}
free(tmp_str);
realm_data = krb5_princ_realm(kr->ctx, fast_princ_struct);
fast_principal_realm = talloc_asprintf(kr, "%.*s", realm_data->length, realm_data->data);
if (!fast_principal_realm) {
DEBUG(1, ("talloc_asprintf failed.\n"));
goto failed;
}
}
kerr = check_fast_ccache(kr->ctx, fast_principal, fast_principal_realm, kr->keytab,
kr, &kr->fast_ccname);
if (kerr != 0) {
DEBUG(1, ("check_fast_ccache failed.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
kerr = sss_krb5_get_init_creds_opt_set_fast_ccache_name(kr->ctx,
kr->options,
kr->fast_ccname);
if (kerr != 0) {
DEBUG(1, ("sss_krb5_get_init_creds_opt_set_fast_ccache_name "
"failed.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
if (strcasecmp(use_fast_str, "demand") == 0) {
kerr = sss_krb5_get_init_creds_opt_set_fast_flags(kr->ctx,
kr->options,
SSS_KRB5_FAST_REQUIRED);
if (kerr != 0) {
DEBUG(1, ("sss_krb5_get_init_creds_opt_set_fast_flags "
"failed.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto failed;
}
}
} else {
DEBUG(1, ("Unsupported value [%s] for krb5_use_fast.\n"));
kerr = EINVAL;
goto failed;
}
}
/* TODO: set options, e.g.
* krb5_get_init_creds_opt_set_forwardable
* krb5_get_init_creds_opt_set_proxiable
* krb5_get_init_creds_opt_set_etype_list
* krb5_get_init_creds_opt_set_address_list
* krb5_get_init_creds_opt_set_preauth_list
* krb5_get_init_creds_opt_set_salt
* krb5_get_init_creds_opt_set_change_password_prompt
* krb5_get_init_creds_opt_set_pa
*/
return EOK;
failed:
return kerr;
}
int main(int argc, const char *argv[])
{
uint8_t *buf = NULL;
int ret;
ssize_t len = 0;
struct pam_data *pd = NULL;
struct krb5_req *kr = NULL;
uint32_t offline;
int opt;
poptContext pc;
int debug_fd = -1;
struct poptOption long_options[] = {
POPT_AUTOHELP
{"debug-level", 'd', POPT_ARG_INT, &debug_level, 0,
_("Debug level"), NULL},
{"debug-timestamps", 0, POPT_ARG_INT, &debug_timestamps, 0,
_("Add debug timestamps"), NULL},
{"debug-microseconds", 0, POPT_ARG_INT, &debug_microseconds, 0,
_("Show timestamps with microseconds"), NULL},
{"debug-fd", 0, POPT_ARG_INT, &debug_fd, 0,
_("An open file descriptor for the debug logs"), NULL},
POPT_TABLEEND
};
/* Set debug level to invalid value so we can decide if -d 0 was used. */
debug_level = SSSDBG_INVALID;
pc = poptGetContext(argv[0], argc, argv, long_options, 0);
while((opt = poptGetNextOpt(pc)) != -1) {
switch(opt) {
default:
fprintf(stderr, "\nInvalid option %s: %s\n\n",
poptBadOption(pc, 0), poptStrerror(opt));
poptPrintUsage(pc, stderr, 0);
_exit(-1);
}
}
poptFreeContext(pc);
CONVERT_AND_SET_DEBUG_LEVEL(debug_level);
debug_prg_name = talloc_asprintf(NULL, "[sssd[krb5_child[%d]]]", getpid());
if (!debug_prg_name) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_asprintf failed.\n"));
goto fail;
}
if (debug_fd != -1) {
ret = set_debug_file_from_fd(debug_fd);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("set_debug_file_from_fd failed.\n"));
}
}
DEBUG(SSSDBG_TRACE_FUNC, ("krb5_child started.\n"));
pd = talloc_zero(NULL, struct pam_data);
if (pd == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_zero failed.\n"));
talloc_free(discard_const(debug_prg_name));
goto fail;
}
talloc_steal(pd, debug_prg_name);
buf = talloc_size(pd, sizeof(uint8_t)*IN_BUF_SIZE);
if (buf == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("malloc failed.\n"));
goto fail;
}
errno = 0;
len = sss_atomic_read_s(STDIN_FILENO, buf, IN_BUF_SIZE);
if (len == -1) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE, ("read failed [%d][%s].\n", ret, strerror(ret)));
goto fail;
}
close(STDIN_FILENO);
kr = talloc_zero(pd, struct krb5_req);
if (kr == NULL) {
DEBUG(1, ("talloc failed.\n"));
goto fail;
}
talloc_set_destructor((TALLOC_CTX *) kr, krb5_cleanup);
kr->pd = pd;
ret = unpack_buffer(buf, len, pd, kr, &offline);
if (ret != EOK) {
DEBUG(1, ("unpack_buffer failed.\n"));
goto fail;
}
ret = krb5_child_setup(kr, offline);
if (ret != EOK) {
DEBUG(1, ("krb5_child_setup failed.\n"));
goto fail;
}
ret = kr->child_req(STDOUT_FILENO, kr);
if (ret != EOK) {
DEBUG(1, ("Child request failed.\n"));
goto fail;
}
DEBUG(SSSDBG_TRACE_FUNC, ("krb5_child completed successfully\n"));
close(STDOUT_FILENO);
talloc_free(pd);
return 0;
fail:
DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_child failed!\n"));
close(STDOUT_FILENO);
talloc_free(pd);
exit(-1);
}