*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/libpq/auth.c,v 1.44 2000/04/12 17:15:13 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/libpq/auth.c,v 1.45 2000/05/27 03:39:31 momjian Exp $
*
*-------------------------------------------------------------------------
*/
*----------------------------------------------------------------
*/
-#include "krb5/krb5.h"
+#include <krb5.h>
+#include <com_err.h>
/*
* pg_an_to_ln -- return the local name corresponding to an authentication
return aname;
}
+
/*
- * pg_krb5_recvauth -- server routine to receive authentication information
- * from the client
- *
- * We still need to compare the username obtained from the client's setup
- * packet to the authenticated name, as described in pg_krb4_recvauth. This
- * is a bit more problematic in v5, as described above in pg_an_to_ln.
- *
- * In addition, as described above in pg_krb5_sendauth, we still need to
- * canonicalize the server name v4-style before constructing a principal
- * from it. Again, this is kind of iffy.
- *
- * Finally, we need to tangle with the fact that v5 doesn't let you explicitly
- * set server keytab file names -- you have to feed lower-level routines a
- * function to retrieve the contents of a keytab, along with a single argument
- * that allows them to open the keytab. We assume that a server keytab is
- * always a real file so we can allow people to specify their own filenames.
- * (This is important because the POSTGRES keytab needs to be readable by
- * non-root users/groups; the v4 tools used to force you do dump a whole
- * host's worth of keys into a file, effectively forcing you to use one file,
- * but kdb5_edit allows you to select which principals to dump. Yay!)
+ * Various krb5 state which is not connection specfic, and a flag to
+ * indicate whether we have initialised it yet.
*/
+static int pg_krb5_initialised;
+static krb5_context pg_krb5_context;
+static krb5_keytab pg_krb5_keytab;
+static krb5_principal pg_krb5_server;
+
+
static int
-pg_krb5_recvauth(Port *port)
+pg_krb5_init(void)
{
- char servbuf[MAXHOSTNAMELEN + 1 +
- sizeof(PG_KRB_SRVNAM)];
- char *hostp,
- *kusername = (char *) NULL;
- krb5_error_code code;
- krb5_principal client,
- server;
- krb5_address sender_addr;
- krb5_rdreq_key_proc keyproc = (krb5_rdreq_key_proc) NULL;
- krb5_pointer keyprocarg = (krb5_pointer) NULL;
+ krb5_error_code retval;
- /*
- * Set up server side -- since we have no ticket file to make this
- * easy, we construct our own name and parse it. See note on
- * canonicalization above.
- */
- strcpy(servbuf, PG_KRB_SRVNAM);
- *(hostp = servbuf + (sizeof(PG_KRB_SRVNAM) - 1)) = '/';
- if (gethostname(++hostp, MAXHOSTNAMELEN) < 0)
- strcpy(hostp, "localhost");
- if (hostp = strchr(hostp, '.'))
- *hostp = '\0';
- if (code = krb5_parse_name(servbuf, &server))
- {
+ if (pg_krb5_initialised)
+ return STATUS_OK;
+
+ retval = krb5_init_context(&pg_krb5_context);
+ if (retval) {
snprintf(PQerrormsg, PQERRORMSG_LENGTH,
- "pg_krb5_recvauth: Kerberos error %d in krb5_parse_name\n", code);
- com_err("pg_krb5_recvauth", code, "in krb5_parse_name");
+ "pg_krb5_init: krb5_init_context returned"
+ " Kerberos error %d\n", retval);
+ com_err("postgres", retval, "while initializing krb5");
return STATUS_ERROR;
}
- /*
- * krb5_sendauth needs this to verify the address in the client
- * authenticator.
- */
- sender_addr.addrtype = port->raddr.in.sin_family;
- sender_addr.length = sizeof(port->raddr.in.sin_addr);
- sender_addr.contents = (krb5_octet *) & (port->raddr.in.sin_addr);
-
- if (strcmp(PG_KRB_SRVTAB, ""))
- {
- keyproc = krb5_kt_read_service_key;
- keyprocarg = PG_KRB_SRVTAB;
+ retval = krb5_kt_resolve(pg_krb5_context, PG_KRB_SRVTAB, &pg_krb5_keytab);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_init: krb5_kt_resolve returned"
+ " Kerberos error %d\n", retval);
+ com_err("postgres", retval, "while resolving keytab file %s",
+ PG_KRB_SRVTAB);
+ krb5_free_context(pg_krb5_context);
+ return STATUS_ERROR;
}
- if (code = krb5_recvauth((krb5_pointer) & port->sock,
- PG_KRB5_VERSION,
- server,
- &sender_addr,
- (krb5_pointer) NULL,
- keyproc,
- keyprocarg,
- (char *) NULL,
- (krb5_int32 *) NULL,
- &client,
- (krb5_ticket **) NULL,
- (krb5_authenticator **) NULL))
- {
+ retval = krb5_sname_to_principal(pg_krb5_context, NULL, PG_KRB_SRVNAM,
+ KRB5_NT_SRV_HST, &pg_krb5_server);
+ if (retval) {
snprintf(PQerrormsg, PQERRORMSG_LENGTH,
- "pg_krb5_recvauth: Kerberos error %d in krb5_recvauth\n", code);
- com_err("pg_krb5_recvauth", code, "in krb5_recvauth");
- krb5_free_principal(server);
+ "pg_krb5_init: krb5_sname_to_principal returned"
+ " Kerberos error %d\n", retval);
+ com_err("postgres", retval,
+ "while getting server principal for service %s",
+ PG_KRB_SRVTAB);
+ krb5_kt_close(pg_krb5_context, pg_krb5_keytab);
+ krb5_free_context(pg_krb5_context);
return STATUS_ERROR;
}
- krb5_free_principal(server);
+
+ pg_krb5_initialised = 1;
+ return STATUS_OK;
+}
+
+
+/*
+ * pg_krb5_recvauth -- server routine to receive authentication information
+ * from the client
+ *
+ * We still need to compare the username obtained from the client's setup
+ * packet to the authenticated name, as described in pg_krb4_recvauth. This
+ * is a bit more problematic in v5, as described above in pg_an_to_ln.
+ *
+ * We have our own keytab file because postgres is unlikely to run as root,
+ * and so cannot read the default keytab.
+ */
+static int
+pg_krb5_recvauth(Port *port)
+{
+ krb5_error_code retval;
+ int ret;
+ krb5_auth_context auth_context = NULL;
+ krb5_ticket *ticket;
+ char *kusername;
+
+ ret = pg_krb5_init();
+ if (ret != STATUS_OK)
+ return ret;
+
+ retval = krb5_recvauth(pg_krb5_context, &auth_context,
+ (krb5_pointer)&port->sock, PG_KRB_SRVNAM,
+ pg_krb5_server, 0, pg_krb5_keytab, &ticket);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_recvauth: krb5_recvauth returned"
+ " Kerberos error %d\n", retval);
+ com_err("postgres", retval, "from krb5_recvauth");
+ return STATUS_ERROR;
+ }
/*
* The "client" structure comes out of the ticket and is therefore
* authenticated. Use it to check the username obtained from the
* postmaster startup packet.
+ *
+ * I have no idea why this is considered necessary.
*/
- if ((code = krb5_unparse_name(client, &kusername)))
- {
+ retval = krb5_unparse_name(pg_krb5_context,
+ ticket->enc_part2->client, &kusername);
+ if (retval) {
snprintf(PQerrormsg, PQERRORMSG_LENGTH,
- "pg_krb5_recvauth: Kerberos error %d in krb5_unparse_name\n", code);
- com_err("pg_krb5_recvauth", code, "in krb5_unparse_name");
- krb5_free_principal(client);
- return STATUS_ERROR;
- }
- krb5_free_principal(client);
- if (!kusername)
- {
- snprintf(PQerrormsg, PQERRORMSG_LENGTH,
- "pg_krb5_recvauth: could not decode username\n");
- fputs(PQerrormsg, stderr);
- pqdebug("%s", PQerrormsg);
+ "pg_krb5_recvauth: krb5_unparse_name returned"
+ " Kerberos error %d\n", retval);
+ com_err("postgres", retval, "while unparsing client name");
+ krb5_free_ticket(pg_krb5_context, ticket);
+ krb5_auth_con_free(pg_krb5_context, auth_context);
return STATUS_ERROR;
}
+
kusername = pg_an_to_ln(kusername);
- if (strncmp(username, kusername, SM_USER))
+ if (strncmp(port->user, kusername, SM_USER))
{
snprintf(PQerrormsg, PQERRORMSG_LENGTH,
- "pg_krb5_recvauth: name \"%s\" != \"%s\"\n", port->user, kusername);
- fputs(PQerrormsg, stderr);
- pqdebug("%s", PQerrormsg);
- pfree(kusername);
- return STATUS_ERROR;
+ "pg_krb5_recvauth: user name \"%s\" != krb5 name \"%s\"\n",
+ port->user, kusername);
+ ret = STATUS_ERROR;
}
- pfree(kusername);
- return STATUS_OK;
+ else
+ ret = STATUS_OK;
+
+ krb5_free_ticket(pg_krb5_context, ticket);
+ krb5_auth_con_free(pg_krb5_context, auth_context);
+ free(kusername);
+
+ return ret;
}
#else
* exceed INITIAL_EXPBUFFER_SIZE (currently 256 bytes).
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-auth.c,v 1.39 2000/04/12 17:17:13 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-auth.c,v 1.40 2000/05/27 03:39:33 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "win32.h"
#else
#include <unistd.h>
+#include <fcntl.h>
#include <sys/param.h> /* for MAXHOSTNAMELEN on most */
#ifndef MAXHOSTNAMELEN
#include <netdb.h> /* for MAXHOSTNAMELEN on some */
*----------------------------------------------------------------
*/
-#include "krb5/krb5.h"
+#include <krb5.h>
+#include <com_err.h>
/*
* pg_an_to_ln -- return the local name corresponding to an authentication
* and we can't afford to punt.
*/
static char *
-pg_an_to_ln(const char *aname)
+pg_an_to_ln(char *aname)
{
char *p;
/*
- * pg_krb5_init -- initialization performed before any Kerberos calls are made
- *
- * With v5, we can no longer set the ticket (credential cache) file name;
- * we now have to provide a file handle for the open (well, "resolved")
- * ticket file everywhere.
- *
+ * Various krb5 state which is not connection specfic, and a flag to
+ * indicate whether we have initialised it yet.
*/
+static int pg_krb5_initialised;
+static krb5_context pg_krb5_context;
+static krb5_ccache pg_krb5_ccache;
+static krb5_principal pg_krb5_client;
+static char *pg_krb5_name;
+
+
static int
- krb5_ccache
-pg_krb5_init(void)
+pg_krb5_init(char *PQerrormsg)
{
- krb5_error_code code;
- char *realm,
- *defname;
- char tktbuf[MAXPGPATH];
- static krb5_ccache ccache = (krb5_ccache) NULL;
+ krb5_error_code retval;
- if (ccache)
- return ccache;
+ if (pg_krb5_initialised)
+ return STATUS_OK;
- /*
- * If the user set PGREALM, then we use a ticket file with a special
- * name: <usual-ticket-file-name>@<PGREALM-value>
- */
- if (!(defname = krb5_cc_default_name()))
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_init: krb5_cc_default_name failed\n");
- return (krb5_ccache) NULL;
- }
- strcpy(tktbuf, defname);
- if (realm = getenv("PGREALM"))
- {
- strcat(tktbuf, "@");
- strcat(tktbuf, realm);
+ retval = krb5_init_context(&pg_krb5_context);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_init: krb5_init_context: %s",
+ error_message(retval));
+ return STATUS_ERROR;
}
- if (code = krb5_cc_resolve(tktbuf, &ccache))
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_init: Kerberos error %d in krb5_cc_resolve\n", code);
- com_err("pg_krb5_init", code, "in krb5_cc_resolve");
- return (krb5_ccache) NULL;
- }
- return ccache;
+ retval = krb5_cc_default(pg_krb5_context, &pg_krb5_ccache);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_init: krb5_cc_default: %s",
+ error_message(retval));
+ krb5_free_context(pg_krb5_context);
+ return STATUS_ERROR;
+ }
+
+ retval = krb5_cc_get_principal(pg_krb5_context, pg_krb5_ccache,
+ &pg_krb5_client);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_init: krb5_cc_get_principal: %s",
+ error_message(retval));
+ krb5_cc_close(pg_krb5_context, pg_krb5_ccache);
+ krb5_free_context(pg_krb5_context);
+ return STATUS_ERROR;
+ }
+
+ retval = krb5_unparse_name(pg_krb5_context, pg_krb5_client, &pg_krb5_name);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_init: krb5_unparse_name: %s",
+ error_message(retval));
+ krb5_free_principal(pg_krb5_context, pg_krb5_client);
+ krb5_cc_close(pg_krb5_context, pg_krb5_ccache);
+ krb5_free_context(pg_krb5_context);
+ return STATUS_ERROR;
+ }
+
+ pg_krb5_name = pg_an_to_ln(pg_krb5_name);
+
+ pg_krb5_initialised = 1;
+ return STATUS_OK;
}
+
/*
* pg_krb5_authname -- returns a pointer to static space containing whatever
* name the user has authenticated to the system
- *
- * We obtain this information by digging around in the ticket file.
- */
+ */
static const char *
-pg_krb5_authname(const char *PQerrormsg)
+pg_krb5_authname(char *PQerrormsg)
{
- krb5_ccache ccache;
- krb5_principal principal;
- krb5_error_code code;
- static char *authname = (char *) NULL;
-
- if (authname)
- return authname;
+ if (pg_krb5_init(PQerrormsg) != STATUS_OK)
+ return NULL;
- ccache = pg_krb5_init(); /* don't free this */
-
- if (code = krb5_cc_get_principal(ccache, &principal))
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_authname: Kerberos error %d in krb5_cc_get_principal\n", code);
- com_err("pg_krb5_authname", code, "in krb5_cc_get_principal");
- return (char *) NULL;
- }
- if (code = krb5_unparse_name(principal, &authname))
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_authname: Kerberos error %d in krb5_unparse_name\n", code);
- com_err("pg_krb5_authname", code, "in krb5_unparse_name");
- krb5_free_principal(principal);
- return (char *) NULL;
- }
- krb5_free_principal(principal);
- return pg_an_to_ln(authname);
+ return pg_krb5_name;
}
+
/*
* pg_krb5_sendauth -- client routine to send authentication information to
* the server
- *
- * This routine does not do mutual authentication, nor does it return enough
- * information to do encrypted connections. But then, if we want to do
- * encrypted connections, we'll have to redesign the whole RPC mechanism
- * anyway.
- *
- * Server hostnames are canonicalized v4-style, i.e., all domain suffixes
- * are simply chopped off. Hence, we are assuming that you've entered your
- * server instances as
- * <value-of-PG_KRB_SRVNAM>/<canonicalized-hostname>
- * in the PGREALM (or local) database. This is probably a bad assumption.
*/
static int
-pg_krb5_sendauth(const char *PQerrormsg, int sock,
+pg_krb5_sendauth(char *PQerrormsg, int sock,
struct sockaddr_in * laddr,
struct sockaddr_in * raddr,
const char *hostname)
{
- char servbuf[MAXHOSTNAMELEN + 1 +
- sizeof(PG_KRB_SRVNAM)];
- const char *hostp;
- const char *realm;
- krb5_error_code code;
- krb5_principal client,
- server;
- krb5_ccache ccache;
- krb5_error *error = (krb5_error *) NULL;
-
- ccache = pg_krb5_init(); /* don't free this */
-
- /*
- * set up client -- this is easy, we can get it out of the ticket
- * file.
- */
- if (code = krb5_cc_get_principal(ccache, &client))
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_sendauth: Kerberos error %d in krb5_cc_get_principal\n", code);
- com_err("pg_krb5_sendauth", code, "in krb5_cc_get_principal");
+ krb5_error_code retval;
+ int ret;
+ krb5_principal server;
+ krb5_auth_context auth_context = NULL;
+ krb5_error *err_ret = NULL;
+ int flags;
+
+ ret = pg_krb5_init(PQerrormsg);
+ if (ret != STATUS_OK)
+ return ret;
+
+ retval = krb5_sname_to_principal(pg_krb5_context, hostname, PG_KRB_SRVNAM,
+ KRB5_NT_SRV_HST, &server);
+ if (retval) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_sendauth: krb5_sname_to_principal: %s",
+ error_message(retval));
return STATUS_ERROR;
}
- /*
- * set up server -- canonicalize as described above
+ /*
+ * libpq uses a non-blocking socket. But kerberos needs a blocking
+ * socket, and we have to block somehow to do mutual authentication
+ * anyway. So we temporarily make it blocking.
*/
- strcpy(servbuf, PG_KRB_SRVNAM);
- *(hostp = servbuf + (sizeof(PG_KRB_SRVNAM) - 1)) = '/';
- if (hostname || *hostname)
- strncpy(++hostp, hostname, MAXHOSTNAMELEN);
- else
- {
- if (gethostname(++hostp, MAXHOSTNAMELEN) < 0)
- strcpy(hostp, "localhost");
- }
- if (hostp = strchr(hostp, '.'))
- *hostp = '\0';
- if (realm = getenv("PGREALM"))
- {
- strcat(servbuf, "@");
- strcat(servbuf, realm);
- }
- if (code = krb5_parse_name(servbuf, &server))
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_sendauth: Kerberos error %d in krb5_parse_name\n", code);
- com_err("pg_krb5_sendauth", code, "in krb5_parse_name");
- krb5_free_principal(client);
+ flags = fcntl(sock, F_GETFL);
+ if (flags < 0 || fcntl(sock, F_SETFL, (long)(flags & ~O_NONBLOCK))) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_sendauth: fcntl: %s", strerror(errno));
+ krb5_free_principal(pg_krb5_context, server);
return STATUS_ERROR;
}
- /*
- * The only thing we want back from krb5_sendauth is an error status
- * and any error messages.
- */
- if (code = krb5_sendauth((krb5_pointer) & sock,
- PG_KRB5_VERSION,
- client,
- server,
- (krb5_flags) 0,
- (krb5_checksum *) NULL,
- (krb5_creds *) NULL,
- ccache,
- (krb5_int32 *) NULL,
- (krb5_keyblock **) NULL,
- &error,
- (krb5_ap_rep_enc_part **) NULL))
- {
- if ((code == KRB5_SENDAUTH_REJECTED) && error)
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_sendauth: authentication rejected: \"%*s\"\n",
- error->text.length, error->text.data);
+ retval = krb5_sendauth(pg_krb5_context, &auth_context,
+ (krb5_pointer) &sock, PG_KRB_SRVNAM,
+ pg_krb5_client, server,
+ AP_OPTS_MUTUAL_REQUIRED,
+ NULL, 0, /* no creds, use ccache instead */
+ pg_krb5_ccache, &err_ret, NULL, NULL);
+ if (retval) {
+ if (retval == KRB5_SENDAUTH_REJECTED && err_ret) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_sendauth: authentication rejected: \"%*s\"",
+ err_ret->text.length, err_ret->text.data);
}
- else
- {
- (void) sprintf(PQerrormsg,
- "pg_krb5_sendauth: Kerberos error %d in krb5_sendauth\n", code);
- com_err("pg_krb5_sendauth", code, "in krb5_sendauth");
+ else {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_sendauth: krb5_sendauth: %s",
+ error_message(retval));
}
+
+ if (err_ret)
+ krb5_free_error(pg_krb5_context, err_ret);
+
+ ret = STATUS_ERROR;
+ }
+
+ krb5_free_principal(pg_krb5_context, server);
+
+ if (fcntl(sock, F_SETFL, (long)flags)) {
+ snprintf(PQerrormsg, PQERRORMSG_LENGTH,
+ "pg_krb5_sendauth: fcntl: %s", strerror(errno));
+ ret = STATUS_ERROR;
}
- krb5_free_principal(client);
- krb5_free_principal(server);
- return code ? STATUS_ERROR : STATUS_OK;
+
+ return ret;
}
#endif /* KRB5 */
projects / postgresql / commitdiff