/*
- * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved.
+ * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
#ifdef GSSAPI
#include "ssh.h"
-#include "ssh1.h"
#include "ssh2.h"
#include "xmalloc.h"
#include "buffer.h"
#include "dispatch.h"
#include "servconf.h"
#include "compat.h"
-#include "misc.h"
#include "monitor_wrap.h"
#include "ssh-gss.h"
extern u_char *session_id2;
extern int session_id2_len;
-typedef struct ssh_gssapi_cred_cache {
- char *filename;
- char *envvar;
- char *envval;
- void *data;
-} ssh_gssapi_cred_cache;
+static ssh_gssapi_client gssapi_client =
+ { {0,NULL}, GSS_C_NO_CREDENTIAL, NULL, {NULL,NULL,NULL}};
-static struct ssh_gssapi_cred_cache gssapi_cred_store = {NULL,NULL,NULL};
-
-/*
- * Environment variables pointing to delegated credentials
- */
-static char *delegation_env[] = {
- "X509_USER_PROXY", /* GSSAPI/SSLeay */
- "KRB5CCNAME", /* Krb5 and possibly SSLeay */
- NULL
-};
-
-static void gssapi_unsetenv(const char *var);
+ssh_gssapi_mech gssapi_null_mech
+ = {NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
#ifdef KRB5
-
-#ifdef HEIMDAL
-#include <krb5.h>
-#else
-#include <gssapi_krb5.h>
-#define krb5_get_err_text(context,code) error_message(code)
-#endif
-
-static krb5_context krb_context = NULL;
-
-/* Initialise the krb5 library, so we can use it for those bits that
- * GSSAPI won't do */
-
-int ssh_gssapi_krb5_init() {
- krb5_error_code problem;
-
- if (krb_context !=NULL)
- return 1;
-
- problem = krb5_init_context(&krb_context);
- if (problem) {
- log("Cannot initialize krb5 context");
- return 0;
- }
- krb5_init_ets(krb_context);
-
- return 1;
-}
-
-/* Check if this user is OK to login. This only works with krb5 - other
- * GSSAPI mechanisms will need their own.
- * Returns true if the user is OK to log in, otherwise returns 0
- */
-
-int
-ssh_gssapi_krb5_userok(char *name) {
- krb5_principal princ;
- int retval;
-
- if (ssh_gssapi_krb5_init() == 0)
- return 0;
-
- if ((retval=krb5_parse_name(krb_context, gssapi_client_name.value,
- &princ))) {
- log("krb5_parse_name(): %.100s",
- krb5_get_err_text(krb_context,retval));
- return 0;
- }
- if (krb5_kuserok(krb_context, princ, name)) {
- retval = 1;
- log("Authorized to %s, krb5 principal %s (krb5_kuserok)",name,
- (char *)gssapi_client_name.value);
- }
- else
- retval = 0;
-
- krb5_free_principal(krb_context, princ);
- return retval;
-}
-
-int
-ssh_gssapi_krb5_localname(char **user)
-{
- krb5_principal princ;
-
- if (ssh_gssapi_krb5_init() == 0)
- return 0;
-
- if (krb5_parse_name(krb_context, gssapi_client_name.value, &princ)) {
- return(0);
- }
- *user = (char *)xmalloc(256);
- if (krb5_aname_to_localname(krb_context, princ, 256, *user)) {
- xfree(*user);
- *user = NULL;
- return(0);
- }
- return(1);
-}
-
-/* Make sure that this is called _after_ we've setuid to the user */
-
-/* This writes out any forwarded credentials. Its specific to the Kerberos
- * GSSAPI mechanism
- *
- * We assume that our caller has made sure that the user has selected
- * delegated credentials, and that the client_creds structure is correctly
- * populated.
- */
-
-OM_uint32
-ssh_gssapi_krb5_storecreds(gss_buffer_t export_buffer) {
- krb5_ccache ccache;
- krb5_error_code problem;
- krb5_principal princ;
- char ccname[35];
- static char name[40];
- int tmpfd;
- OM_uint32 maj_status,min_status;
- gss_cred_id_t krb5_cred_handle;
-
-
- if (gssapi_client_creds==NULL) {
- debug("No credentials stored");
- return GSS_S_NO_CRED;
- }
-
- if (ssh_gssapi_krb5_init() == 0)
- return GSS_S_FAILURE;
-
- if (options.gss_use_session_ccache) {
- snprintf(ccname,sizeof(ccname),"/tmp/krb5cc_%d_XXXXXX",geteuid());
-
- if ((tmpfd = mkstemp(ccname))==-1) {
- log("mkstemp(): %.100s", strerror(errno));
- return GSS_S_FAILURE;
- }
- if (fchmod(tmpfd, S_IRUSR | S_IWUSR) == -1) {
- log("fchmod(): %.100s", strerror(errno));
- close(tmpfd);
- return GSS_S_FAILURE;
- }
- } else {
- snprintf(ccname,sizeof(ccname),"/tmp/krb5cc_%d",geteuid());
- tmpfd = open(ccname, O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR);
- if (tmpfd == -1) {
- log("open(): %.100s", strerror(errno));
- return GSS_S_FAILURE;
- }
- }
-
- close(tmpfd);
- snprintf(name, sizeof(name), "FILE:%s",ccname);
-
- if ((problem = krb5_cc_resolve(krb_context, name, &ccache))) {
- log("krb5_cc_default(): %.100s",
- krb5_get_err_text(krb_context,problem));
- return GSS_S_FAILURE;
- }
-
- if ((problem = krb5_parse_name(krb_context, gssapi_client_name.value,
- &princ))) {
- log("krb5_parse_name(): %.100s",
- krb5_get_err_text(krb_context,problem));
- krb5_cc_destroy(krb_context,ccache);
- return GSS_S_FAILURE;
- }
-
- if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
- log("krb5_cc_initialize(): %.100s",
- krb5_get_err_text(krb_context,problem));
- krb5_free_principal(krb_context,princ);
- krb5_cc_destroy(krb_context,ccache);
- return GSS_S_FAILURE;
- }
-
- krb5_free_principal(krb_context,princ);
-
-#ifdef MECHGLUE
- krb5_cred_handle =
- __gss_get_mechanism_cred(gssapi_client_creds,
- &(supported_mechs[GSS_KERBEROS].oid));
-#else
- krb5_cred_handle = gssapi_client_creds;
+extern ssh_gssapi_mech gssapi_kerberos_mech;
+extern ssh_gssapi_mech gssapi_kerberos_mech_old;
#endif
-
- if ((maj_status = gss_krb5_copy_ccache(&min_status,
- krb5_cred_handle,
- ccache))) {
- log("gss_krb5_copy_ccache() failed");
- ssh_gssapi_error(&supported_mechs[GSS_KERBEROS].oid,
- maj_status,min_status);
- krb5_cc_destroy(krb_context,ccache);
- return GSS_S_FAILURE;
- }
-
- krb5_cc_close(krb_context,ccache);
-
- export_buffer->length = strlen("KRB5CCNAME")+strlen(name)+1;
- export_buffer->value = xmalloc(export_buffer->length+1);
- sprintf(export_buffer->value, "%s=%s", "KRB5CCNAME", name);
-
- return GSS_S_COMPLETE;
-}
-
-#endif /* KRB5 */
-
#ifdef GSI
-#include <globus_gss_assist.h>
-
-/*
- * Check if this user is OK to login under GSI. User has been authenticated
- * as identity in global 'client_name.value' and is trying to log in as passed
- * username in 'name'.
- *
- * Returns non-zero if user is authorized, 0 otherwise.
- */
-int
-ssh_gssapi_gsi_userok(char *name)
-{
- int authorized = 0;
-
-#ifdef GLOBUS_GSI_GSS_ASSIST_MODULE
- if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) {
- return 0;
- }
+extern ssh_gssapi_mech gssapi_gsi_mech;
+extern ssh_gssapi_mech gssapi_gsi_mech_old;
#endif
- /* globus_gss_assist_userok() returns 0 on success */
- authorized = (globus_gss_assist_userok(gssapi_client_name.value,
- name) == 0);
-
- log("GSI user %s is%s authorized as target user %s",
- (char *) gssapi_client_name.value, (authorized ? "" : " not"), name);
-
- return authorized;
-}
-
-/*
- * Return the local username associated with the GSI credentials.
- */
-int
-ssh_gssapi_gsi_localname(char **user)
-{
-#ifdef GLOBUS_GSI_GSS_ASSIST_MODULE
- if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) {
- return 0;
- }
-#endif
- return(globus_gss_assist_gridmap(gssapi_client_name.value, user) == 0);
-}
-
-/*
- * Handle setting up child environment for GSI.
- *
- * Make sure that this is called _after_ we've setuid to the user.
- */
-OM_uint32
-ssh_gssapi_gsi_storecreds(gss_buffer_t export_buffer)
-{
- OM_uint32 major_status;
- OM_uint32 minor_status;
-
- if (gssapi_client_creds != NULL)
- {
- char *creds_env = NULL;
-
- /*
- * This is the current hack with the GSI gssapi library to
- * export credentials to disk.
- */
-
- debug("Exporting delegated credentials");
-
- minor_status = 0xdee0; /* Magic value */
- major_status =
- gss_inquire_cred(&minor_status,
- gssapi_client_creds,
- (gss_name_t *) &creds_env,
- NULL,
- NULL,
- NULL);
-
- if ((major_status == GSS_S_COMPLETE) &&
- (minor_status == 0xdee1) &&
- (creds_env != NULL))
- {
- char *value;
-
- /*
- * String is of the form:
- * X509_USER_DELEG_PROXY=filename
- * so we parse out the filename
- * and then set X509_USER_PROXY
- * to point at it.
- */
- value = strchr(creds_env, '=');
-
- if (value != NULL)
- {
- *value = '\0';
- value++;
- export_buffer->length=
- strlen("X509_USER_PROXY")+strlen(value)+1;
- export_buffer->value =
- xmalloc(export_buffer->length+1);
- sprintf(export_buffer->value, "%s=%s",
- "X509_USER_PROXY", value);
-
- return GSS_S_COMPLETE;
- }
- else
- {
- log("Failed to parse delegated credentials string '%s'",
- creds_env);
- }
- }
- else
- {
- log("Failed to export delegated credentials (error %u)",
- (unsigned int)major_status);
- }
- }
- return 0;
-}
-
-#endif /* GSI */
-
-void
-ssh_gssapi_cleanup_creds(void *ignored)
-{
- /* OM_uint32 min_stat; */
-
- if (gssapi_cred_store.filename!=NULL) {
- /* Unlink probably isn't sufficient */
- debug("removing gssapi cred file \"%s\"",gssapi_cred_store.filename);
- unlink(gssapi_cred_store.filename);
- }
- /* DK ??
- if (gssapi_client_creds != GSS_C_NO_CREDENTIAL)
- gss_release_cred(&min_stat, &gssapi_client_creds);
- */
-}
-
-OM_uint32
-ssh_gssapi_export_cred(OM_uint32 * minor_status,
- const gss_cred_id_t cred_handle,
- const gss_OID desired_mech,
- OM_uint32 option_req,
- gss_buffer_t export_buffer)
-{
- OM_uint32 maj_stat = GSS_S_FAILURE;
-
- if (option_req != 1) return GSS_S_UNAVAILABLE;
- if (desired_mech != NULL) return GSS_S_BAD_MECH;
-
- switch (gssapi_client_type) {
+ssh_gssapi_mech* supported_mechs[]= {
#ifdef KRB5
- case GSS_KERBEROS:
- maj_stat = ssh_gssapi_krb5_storecreds(export_buffer);
- break;
+ &gssapi_kerberos_mech,
+ &gssapi_kerberos_mech_old, /* Support for legacy clients */
#endif
#ifdef GSI
- case GSS_GSI:
- maj_stat = ssh_gssapi_gsi_storecreds(export_buffer);
- break;
-#endif /* GSI */
- case GSS_LAST_ENTRY:
- /* GSSAPI not used in this authentication */
- debug("No GSSAPI credentials stored");
- break;
- default:
- log("ssh_gssapi_do_child: Unknown mechanism");
-
- }
-
- if (GSS_ERROR(maj_stat)) {
- *minor_status = GSS_S_FAILURE;
- }
- return maj_stat;
-}
-
-void
-ssh_gssapi_storecreds()
-{
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc export_cred = GSS_C_EMPTY_BUFFER;
- char *p;
-
- if (gssapi_client_creds == GSS_C_NO_CREDENTIAL)
- return;
-
-#ifdef HAVE_GSSAPI_EXT
- maj_stat = gss_export_cred(&min_stat, gssapi_client_creds,
- GSS_C_NO_OID, 1, &export_cred);
- if (GSS_ERROR(maj_stat) && maj_stat != GSS_S_UNAVAILABLE) {
- ssh_gssapi_error(GSS_C_NO_OID, maj_stat, min_stat);
- return;
- }
-#endif
-
- /* If gss_export_cred() is not available, use old methods */
- if (export_cred.length == 0) {
- ssh_gssapi_export_cred(&min_stat, gssapi_client_creds,
- GSS_C_NO_OID, 1, &export_cred);
- if (GSS_ERROR(maj_stat)) {
- ssh_gssapi_error(GSS_C_NO_OID, maj_stat, min_stat);
- }
- }
-
- p = strchr((char *) export_cred.value, '=');
- if (p == NULL) {
- log("Failed to parse exported credentials string '%.100s'",
- (char *)export_cred.value);
- gss_release_buffer(&min_stat, &export_cred);
- return;
- }
- *p++ = '\0';
-#ifdef GSI
- if (strcmp((char *)export_cred.value,"X509_USER_DELEG_PROXY") == 0)
- gssapi_cred_store.envvar = strdup("X509_USER_PROXY");
- else
+ &gssapi_gsi_mech,
+ &gssapi_gsi_mech_old, /* Support for legacy clients */
#endif
- gssapi_cred_store.envvar = strdup((char *)export_cred.value);
- gssapi_cred_store.envval = strdup(p);
-#ifdef USE_PAM
- do_pam_putenv(gssapi_cred_store.envvar, gssapi_cred_store.envval);
-#endif
- if (strncmp(p, "FILE:", 5) == 0) {
- p += 5;
- }
- if (access(p, R_OK) == 0) {
- gssapi_cred_store.filename = strdup(p);
- }
- gss_release_buffer(&min_stat, &export_cred);
-
- if (options.gss_cleanup_creds) {
- fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL);
- }
-}
+ &gssapi_null_mech,
+};
-/* This allows GSSAPI methods to do things to the childs environment based
- * on the passed authentication process and credentials.
+/* Return a list of the gss-group1-sha1-x mechanisms supported by this
+ * program.
*
- * Question: If we didn't use userauth_external for some reason, should we
- * still delegate credentials?
- */
-void
-ssh_gssapi_do_child(char ***envp, u_int *envsizep)
-{
-
- if (gssapi_cred_store.envvar!=NULL &&
- gssapi_cred_store.envval!=NULL) {
-
- debug("Setting %s to %s", gssapi_cred_store.envvar,
- gssapi_cred_store.envval);
- child_set_env(envp, envsizep, gssapi_cred_store.envvar,
- gssapi_cred_store.envval);
- }
-
- switch(gssapi_client_type) {
-#ifdef KRB5
- case GSS_KERBEROS: break;
-#endif
-#ifdef GSI
- case GSS_GSI: break;
-#endif
- case GSS_LAST_ENTRY:
- debug("No GSSAPI credentials stored");
- break;
- default:
- log("ssh_gssapi_do_child: Unknown mechanism");
- }
-}
-
-int
-ssh_gssapi_userok(char *user)
-{
- if (gssapi_client_name.length==0 ||
- gssapi_client_name.value==NULL) {
- debug("No suitable client data");
- return 0;
- }
- switch (gssapi_client_type) {
-#ifdef KRB5
- case GSS_KERBEROS:
- return(ssh_gssapi_krb5_userok(user));
- break; /* Not reached */
-#endif
-#ifdef GSI
- case GSS_GSI:
- return(ssh_gssapi_gsi_userok(user));
- break; /* Not reached */
-#endif /* GSI */
- case GSS_LAST_ENTRY:
- debug("Client not GSSAPI");
- break;
- default:
- debug("Unknown client authentication type");
- }
- return(0);
-}
-
-int
-ssh_gssapi_localname(char **user)
-{
- *user = NULL;
- if (gssapi_client_name.length==0 ||
- gssapi_client_name.value==NULL) {
- debug("No suitable client data");
- return(0);;
- }
- switch (gssapi_client_type) {
-#ifdef KRB5
- case GSS_KERBEROS:
- return(ssh_gssapi_krb5_localname(user));
- break; /* Not reached */
-#endif
-#ifdef GSI
- case GSS_GSI:
- return(ssh_gssapi_gsi_localname(user));
- break; /* Not reached */
-#endif /* GSI */
- case GSS_LAST_ENTRY:
- debug("Client not GSSAPI");
- break;
- default:
- debug("Unknown client authentication type");
- }
- return(0);
-}
-
-/*
- * Clean our environment on startup. This means removing any environment
- * strings that might inadvertantly been in root's environment and
- * could cause serious security problems if we think we set them.
+ * We only support the mechanisms that we've indicated in the list above,
+ * but we check that they're supported by the GSSAPI mechanism on the
+ * machine. We also check, before including them in the list, that
+ * we have the necesary information in order to carry out the key exchange
+ * (that is, that the user has credentials, the server's creds are accessible,
+ * etc)
+ *
+ * The way that this is done is fairly nasty, as we do a lot of work that
+ * is then thrown away. This should possibly be implemented with a cache
+ * that stores the results (in an expanded Gssctxt structure), which are
+ * then used by the first calls if that key exchange mechanism is chosen.
*/
-void
-ssh_gssapi_clean_env(void)
-{
- char *envstr;
- int envstr_index;
-
-
- for (envstr_index = 0;
- (envstr = delegation_env[envstr_index]) != NULL;
- envstr_index++) {
-
- if (getenv(envstr)) {
- debug("Clearing environment variable %s", envstr);
- gssapi_unsetenv(envstr);
- }
- }
-}
-
-/*
- * Wrapper around unsetenv.
- */
-static void
-gssapi_unsetenv(const char *var)
-{
-#ifdef HAVE_UNSETENV
- unsetenv(var);
-
-#else /* !HAVE_UNSETENV */
- extern char **environ;
- char **p1 = environ; /* New array list */
- char **p2 = environ; /* Current array list */
- int len = strlen(var);
-
- /*
- * Walk through current environ array (p2) copying each pointer
- * to new environ array (p1) unless the pointer is to the item
- * we want to delete. Copy happens in place.
- */
- while (*p2) {
- if ((strncmp(*p2, var, len) == 0) &&
- ((*p2)[len] == '=')) {
- /*
- * *p2 points at item to be deleted, just skip over it
- */
- p2++;
- } else {
- /*
- * *p2 points at item we want to save, so copy it
- */
- *p1 = *p2;
- p1++;
- p2++;
- }
- }
-
- /* And make sure new array is NULL terminated */
- *p1 = NULL;
-#endif /* HAVE_UNSETENV */
-}
+/* Unpriviledged */
char *
-ssh_server_gssapi_mechanisms() {
+ssh_gssapi_server_mechanisms() {
gss_OID_set supported;
+ Gssctxt *ctx = NULL;
OM_uint32 maj_status, min_status;
Buffer buf;
int i = 0;
+ int first = 0;
int present;
- int mech_count=0;
char * mechs;
- Gssctxt * ctx = NULL;
if (datafellows & SSH_OLD_GSSAPI) return NULL;
- PRIVSEP(gss_indicate_mechs(&min_status, &supported));
+ ssh_gssapi_supported_oids(&supported);
- buffer_init(&buf);
+ buffer_init(&buf);
- do {
+ while(supported_mechs[i]->name != NULL) {
if ((maj_status=gss_test_oid_set_member(&min_status,
- &supported_mechs[i].oid,
+ &supported_mechs[i]->oid,
supported,
&present))) {
present=0;
}
+
if (present) {
- if (!GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx,
- &supported_mechs[i].oid)))) {
- /* Append gss_group1_sha1_x to our list */
- if (++mech_count > 1) {
- buffer_append(&buf, ",", 1);
- }
- buffer_append(&buf, gssprefix,
- strlen(gssprefix));
- buffer_append(&buf,
- supported_mechs[i].enc_name,
- strlen(supported_mechs[i].enc_name));
- debug("GSSAPI mechanism %s (%s%s) supported",
- supported_mechs[i].name, gssprefix,
- supported_mechs[i].enc_name);
- } else {
- debug("no credentials for GSSAPI mechanism %s",
- supported_mechs[i].name);
- }
- } else {
+ if (!GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx,
+ &supported_mechs[i]->oid)))) {
+ /* Append gss_group1_sha1_x to our list */
+ if (first++!=0)
+ buffer_put_char(&buf,',');
+ buffer_append(&buf, KEX_GSS_SHA1,
+ sizeof(KEX_GSS_SHA1)-1);
+ buffer_append(&buf,
+ supported_mechs[i]->enc_name,
+ strlen(supported_mechs[i]->enc_name));
+ debug("GSSAPI mechanism %s (%s%s) supported",
+ supported_mechs[i]->name, KEX_GSS_SHA1,
+ supported_mechs[i]->enc_name);
+ } else {
+ debug("no credentials for GSSAPI mechanism %s",
+ supported_mechs[i]->name);
+ }
+ } else {
debug("GSSAPI mechanism %s not supported",
- supported_mechs[i].name);
+ supported_mechs[i]->name);
}
- } while (supported_mechs[++i].name != NULL);
+ ssh_gssapi_delete_ctx(&ctx);
+ i++;
+ }
buffer_put_char(&buf,'\0');
return(mechs);
}
-OM_uint32
-ssh_gssapi_server_ctx(Gssctxt **ctx,gss_OID oid) {
- if (*ctx) ssh_gssapi_delete_ctx(ctx);
- ssh_gssapi_build_ctx(ctx);
- ssh_gssapi_set_oid(*ctx,oid);
- return(ssh_gssapi_acquire_cred(*ctx));
-}
-
+/* Unpriviledged */
void ssh_gssapi_supported_oids(gss_OID_set *oidset) {
- enum ssh_gss_id i =0;
+ int i =0;
OM_uint32 maj_status,min_status;
int present;
gss_OID_set supported;
gss_create_empty_oid_set(&min_status,oidset);
PRIVSEP(gss_indicate_mechs(&min_status, &supported));
- while (supported_mechs[i].name!=NULL) {
+ while (supported_mechs[i]->name!=NULL) {
if ((maj_status=gss_test_oid_set_member(&min_status,
- &supported_mechs[i].oid,
+ &supported_mechs[i]->oid,
supported,
&present))) {
present=0;
}
if (present) {
gss_add_oid_set_member(&min_status,
- &supported_mechs[i].oid,
+ &supported_mechs[i]->oid,
oidset);
}
i++;
}
}
-/* Wrapper arround accept_sec_context
+/* Find out which GSS type (out of the list we define in ssh-gss.h) a
+ * particular connection is using
+ */
+
+/* Priviledged (called ssh_gssapi_accept_ctx -> ssh_gssapi_getclient ->) */
+ssh_gssapi_mech *
+ssh_gssapi_get_ctype(Gssctxt *ctxt) {
+ int i=0;
+
+ while(supported_mechs[i]->name!=NULL) {
+ if (supported_mechs[i]->oid.length == ctxt->oid->length &&
+ (memcmp(supported_mechs[i]->oid.elements,
+ ctxt->oid->elements,ctxt->oid->length)==0)) {
+ return supported_mechs[i];
+ }
+ i++;
+ }
+ return NULL;
+}
+
+/* Return the OID that corresponds to the given context name */
+
+/* Unpriviledged */
+gss_OID
+ssh_gssapi_server_id_kex(char *name) {
+ int i=0;
+
+ if (strncmp(name, KEX_GSS_SHA1, sizeof(KEX_GSS_SHA1)-1) !=0) {
+ return(NULL);
+ }
+
+ name+=sizeof(KEX_GSS_SHA1)-1; /* Move to the start of the MIME string */
+
+ while (supported_mechs[i]->name!=NULL &&
+ strcmp(name,supported_mechs[i]->enc_name)!=0) {
+ i++;
+ }
+
+ if (supported_mechs[i]->name==NULL)
+ return (NULL);
+
+ debug("using GSSAPI mechanism %s (%s%s)", supported_mechs[i]->name,
+ KEX_GSS_SHA1, supported_mechs[i]->enc_name);
+
+ return &supported_mechs[i]->oid;
+}
+
+/* Wrapper around accept_sec_context
* Requires that the context contains:
* oid
* credentials (from ssh_gssapi_acquire_cred)
*/
+/* Priviledged */
OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx,gss_buffer_desc *recv_tok,
gss_buffer_desc *send_tok, OM_uint32 *flags)
{
- OM_uint32 maj_status, min_status;
+ OM_uint32 status;
gss_OID mech;
- maj_status=gss_accept_sec_context(&min_status,
+ ctx->major=gss_accept_sec_context(&ctx->minor,
&ctx->context,
ctx->creds,
recv_tok,
flags,
NULL,
&ctx->client_creds);
- if (GSS_ERROR(maj_status)) {
- ssh_gssapi_send_error(ctx->oid,maj_status,min_status);
+ if (GSS_ERROR(ctx->major)) {
+ ssh_gssapi_error(ctx);
}
if (ctx->client_creds) {
/* FIXME: We should check that the me
* the one that we asked for (in ctx->oid) */
- ctx->status=maj_status;
+ status=ctx->major;
/* Now, if we're complete and we have the right flags, then
* we flag the user as also having been authenticated
if (((flags==NULL) || ((*flags & GSS_C_MUTUAL_FLAG) &&
(*flags & GSS_C_INTEG_FLAG))) &&
- (maj_status == GSS_S_COMPLETE)) {
- if (ssh_gssapi_getclient(ctx,&gssapi_client_type,
- &gssapi_client_name,
- &gssapi_client_creds))
+ (ctx->major == GSS_S_COMPLETE)) {
+ if (ssh_gssapi_getclient(ctx,&gssapi_client.mech,
+ &gssapi_client.name,
+ &gssapi_client.creds))
fatal("Couldn't convert client name");
}
- return(maj_status);
+ /* Make sure that the getclient call hasn't stamped on this */
+ return(status);
+}
+
+/* Extract the client details from a given context. This can only reliably
+ * be called once for a context */
+
+/* Priviledged (called from accept_secure_ctx) */
+OM_uint32
+ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_mech **type,
+ gss_buffer_desc *name, gss_cred_id_t *creds) {
+
+ *type=ssh_gssapi_get_ctype(ctx);
+ if ((ctx->major=gss_display_name(&ctx->minor,ctx->client,name,NULL))) {
+ ssh_gssapi_error(ctx);
+ return(ctx->major);
+ }
+
+ /* This is icky. There appears to be no way to copy this structure,
+ * rather than the pointer to it, so we simply copy the pointer and
+ * mark the originator as empty so we don't destroy it.
+ */
+ *creds=ctx->client_creds;
+ ctx->client_creds=GSS_C_NO_CREDENTIAL;
+ return(ctx->major);
}
+/* As user - called through fatal cleanup hook */
void
-ssh_gssapi_send_error(gss_OID mech, OM_uint32 major_status,
- OM_uint32 minor_status) {
- OM_uint32 lmaj, lmin;
- gss_buffer_desc msg = {0,NULL};
- OM_uint32 ctx;
-
- ctx = 0;
- /* The GSSAPI error */
- do {
- lmaj = PRIVSEP(gss_display_status(&lmin, major_status,
- GSS_C_GSS_CODE,
- mech,
- &ctx, &msg));
- if (lmaj == GSS_S_COMPLETE) {
- debug((char *)msg.value);
- packet_send_debug((char *)msg.value);
- (void) gss_release_buffer(&lmin, &msg);
- }
- } while (ctx!=0);
-
- /* The mechanism specific error */
- do {
- lmaj = PRIVSEP(gss_display_status(&lmin, minor_status,
- GSS_C_MECH_CODE,
- mech,
- &ctx, &msg));
- if (lmaj == GSS_S_COMPLETE) {
- debug((char *)msg.value);
- packet_send_debug((char *)msg.value);
- (void) gss_release_buffer(&lmin, &msg);
- }
- } while (ctx!=0);
+ssh_gssapi_cleanup_creds(void *ignored)
+{
+ if (gssapi_client.store.filename!=NULL) {
+ /* Unlink probably isn't sufficient */
+ debug("removing gssapi cred file\"%s\"",gssapi_client.store.filename);
+ unlink(gssapi_client.store.filename);
+ }
+}
+
+/* As user */
+void
+ssh_gssapi_storecreds()
+{
+ if (gssapi_client.mech && gssapi_client.mech->storecreds) {
+ (*gssapi_client.mech->storecreds)(&gssapi_client);
+ if (options.gss_cleanup_creds) {
+ fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL);
+ }
+ } else {
+ debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
+ }
}
-#endif /* GSSAPI */
+/* This allows GSSAPI methods to do things to the childs environment based
+ * on the passed authentication process and credentials.
+ */
+/* As user */
+void
+ssh_gssapi_do_child(char ***envp, u_int *envsizep)
+{
+
+ if (gssapi_client.store.envvar!=NULL &&
+ gssapi_client.store.envval!=NULL) {
+
+ debug("Setting %s to %s", gssapi_client.store.envvar,
+ gssapi_client.store.envval);
+ child_set_env(envp, envsizep, gssapi_client.store.envvar,
+ gssapi_client.store.envval);
+ }
+}
+
+/* Priviledged */
+int
+ssh_gssapi_userok(char *user)
+{
+ if (gssapi_client.name.length==0 ||
+ gssapi_client.name.value==NULL) {
+ debug("No suitable client data");
+ return 0;
+ }
+ if (gssapi_client.mech && gssapi_client.mech->userok) {
+ return((*gssapi_client.mech->userok)(&gssapi_client,user));
+ } else {
+ debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
+ }
+ return(0);
+}
+
+/* Priviledged */
+int
+ssh_gssapi_localname(char **user)
+{
+ *user = NULL;
+ if (gssapi_client.name.length==0 ||
+ gssapi_client.name.value==NULL) {
+ debug("No suitable client data");
+ return(0);;
+ }
+ if (gssapi_client.mech && gssapi_client.mech->localname) {
+ return((*gssapi_client.mech->localname)(&gssapi_client,user));
+ } else {
+ debug("Unknown client authentication type");
+ }
+ return(0);
+}
+#endif
andersk / gssapi-openssh.git / blobdiff