From 7852becab01989634aacc1fb8ff9581a11a7cdcf Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 24 Aug 2016 12:56:54 -0400 Subject: [cifs-utils PATCH 6/6] cifs.upcall: stop passing around ccache name strings Instead, get a ccache handle and pass that around. That way we can keep the cache open until the program is complete as well. Signed-off-by: Jeff Layton --- cifs.upcall.c | 98 +++++++++++++++++++++++++---------------------------------- 1 file changed, 41 insertions(+), 57 deletions(-) diff --git a/cifs.upcall.c b/cifs.upcall.c index a20576654a95..8f146c92b4a5 100644 --- a/cifs.upcall.c +++ b/cifs.upcall.c @@ -117,7 +117,7 @@ static time_t get_tgt_time(krb5_ccache ccache) if (krb5_cc_get_principal(context, ccache, &principal)) { syslog(LOG_DEBUG, "%s: unable to get principal", __func__); - goto err_princ; + goto err_cache; } if (krb5_cc_start_seq_get(context, ccache, &cur)) { @@ -154,32 +154,27 @@ err_cache: return credtime; } -static char * +static krb5_ccache get_default_cc(void) { - const char *ccname; - char *rcc = NULL; - krb5_ccache ccache; + krb5_error_code ret; + krb5_ccache cc; - ccname = krb5_cc_default_name(context); - if (!ccname) { - syslog(LOG_DEBUG, "%s: krb5_cc_default returned NULL.", __func__); + ret = krb5_cc_default(context, &cc); + if (ret) { + syslog(LOG_DEBUG, "%s: krb5_cc_default returned %d", __func__, ret); return NULL; } - if (krb5_cc_resolve(context, ccname, &ccache)) { - syslog(LOG_DEBUG, "%s: unable to resolve krb5 cache", __func__); - return NULL; + if (!get_tgt_time(cc)) { + krb5_cc_close(context, cc); + cc = NULL; } - - if (get_tgt_time(ccache)) - rcc = strdup(ccname); - krb5_cc_close(context, ccache); - return rcc; + return cc; } -static char * +static krb5_ccache init_cc_from_keytab(const char *keytab_name, const char *user) { krb5_error_code ret; @@ -187,7 +182,6 @@ init_cc_from_keytab(const char *keytab_name, const char *user) krb5_keytab keytab = NULL; krb5_principal me = NULL; krb5_ccache cc = NULL; - char *ccname = NULL; memset((char *) &my_creds, 0, sizeof(my_creds)); @@ -229,61 +223,46 @@ init_cc_from_keytab(const char *keytab_name, const char *user) } ret = krb5_cc_store_cred(context, cc, &my_creds); - if (ret) + if (ret) { syslog(LOG_DEBUG, "krb5_cc_store_cred: %d", (int)ret); - - ccname = strdup(krb5_cc_default_name(context)); - if (ccname == NULL) - syslog(LOG_ERR, "Unable to allocate memory"); -icfk_cleanup: + goto icfk_cleanup; + } +out: my_creds.client = (krb5_principal)0; krb5_free_cred_contents(context, &my_creds); if (me) krb5_free_principal(context, me); - if (cc) - krb5_cc_close(context, cc); if (keytab) krb5_kt_close(context, keytab); - return ccname; + return cc; +icfk_cleanup: + if (cc) { + krb5_cc_close(context, cc); + cc = NULL; + } + goto out; } static int -cifs_krb5_get_req(const char *host, const char *ccname, +cifs_krb5_get_req(const char *host, krb5_ccache ccache, DATA_BLOB * mechtoken, DATA_BLOB * sess_key) { krb5_error_code ret; krb5_keyblock *tokb; - krb5_ccache ccache; krb5_creds in_creds, *out_creds; krb5_data apreq_pkt, in_data; krb5_auth_context auth_context = NULL; #if defined(HAVE_KRB5_AUTH_CON_SETADDRS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) static const uint8_t gss_cksum[24] = { 0x10, 0x00, /* ... */}; #endif - if (ccname) { - ret = krb5_cc_resolve(context, ccname, &ccache); - if (ret) { - syslog(LOG_DEBUG, "%s: unable to resolve %s to ccache\n", - __func__, ccname); - return ret; - } - } else { - ret = krb5_cc_default(context, &ccache); - if (ret) { - syslog(LOG_DEBUG, "%s: krb5_cc_default: %d", - __func__, (int)ret); - return ret; - } - } - memset(&in_creds, 0, sizeof(in_creds)); ret = krb5_cc_get_principal(context, ccache, &in_creds.client); if (ret) { syslog(LOG_DEBUG, "%s: unable to get client principal name", __func__); - goto out_free_ccache; + return ret; } ret = krb5_sname_to_principal(context, host, "cifs", KRB5_NT_UNKNOWN, @@ -383,8 +362,6 @@ out_free_creds: krb5_free_creds(context, out_creds); out_free_principal: krb5_free_principal(context, in_creds.client); -out_free_ccache: - krb5_cc_close(context, ccache); return ret; } @@ -410,7 +387,7 @@ out_free_ccache: */ static int handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob, - DATA_BLOB * sess_key, const char *ccname) + DATA_BLOB * sess_key, krb5_ccache ccache) { int retval; DATA_BLOB tkt, tkt_wrapped; @@ -418,7 +395,7 @@ handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob, syslog(LOG_DEBUG, "%s: getting service ticket for %s", __func__, host); /* get a kerberos ticket for the service and extract the session key */ - retval = cifs_krb5_get_req(host, ccname, &tkt, sess_key); + retval = cifs_krb5_get_req(host, ccache, &tkt, sess_key); if (retval) { syslog(LOG_DEBUG, "%s: failed to obtain service ticket (%d)", __func__, retval); @@ -709,12 +686,13 @@ int main(const int argc, char *const argv[]) unsigned int have; long rc = 1; int c, try_dns = 0, legacy_uid = 0; - char *buf, *ccname = NULL; + char *buf; char hostbuf[NI_MAXHOST], *host; struct decoded_args arg; const char *oid; uid_t uid; char *keytab_name = NULL; + krb5_ccache ccache = NULL; hostbuf[0] = '\0'; memset(&arg, 0, sizeof(arg)); @@ -828,10 +806,15 @@ int main(const int argc, char *const argv[]) goto out; } - ccname = get_default_cc(); + ccache = get_default_cc(); /* Couldn't find credcache? Try to use keytab */ - if (ccname == NULL && arg.username != NULL) - ccname = init_cc_from_keytab(keytab_name, arg.username); + if (ccache == NULL && arg.username != NULL) + ccache = init_cc_from_keytab(keytab_name, arg.username); + + if (ccache == NULL) { + rc = 1; + goto out; + } host = arg.hostname; @@ -859,7 +842,7 @@ int main(const int argc, char *const argv[]) retry_new_hostname: lowercase_string(host); - rc = handle_krb5_mech(oid, host, &secblob, &sess_key, ccname); + rc = handle_krb5_mech(oid, host, &secblob, &sess_key, ccache); if (!rc) break; @@ -904,7 +887,7 @@ retry_new_hostname: break; } - rc = handle_krb5_mech(oid, fqdn, &secblob, &sess_key, ccname); + rc = handle_krb5_mech(oid, fqdn, &secblob, &sess_key, ccache); if (!rc) break; } @@ -968,9 +951,10 @@ out: } data_blob_free(&secblob); data_blob_free(&sess_key); + if (ccache) + krb5_cc_close(context, ccache); if (context) krb5_free_context(context); - SAFE_FREE(ccname); SAFE_FREE(arg.hostname); SAFE_FREE(arg.ip); SAFE_FREE(arg.username); -- 2.7.4