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33 #endif /* HAVE_CONFIG_H */
41 #include <gssapi/gssapi.h>
47 #include "svcgssd_krb5.h"
51 char *supported_enctypes_filename = "/proc/fs/nfsd/supported_krb5_enctypes";
52 int parsed_num_enctypes = 0;
53 krb5_enctype *parsed_enctypes = NULL;
54 char *cached_enctypes = NULL;
56 /*==========================*/
57 /*=== Internal routines ===*/
58 /*==========================*/
61 * Parse the supported encryption type information
64 parse_enctypes(char *enctypes)
70 /* Don't parse the same string over and over... */
71 if (cached_enctypes && strcmp(cached_enctypes, enctypes) == 0)
74 /* Free any existing cached_enctypes */
75 free(cached_enctypes);
77 if (parsed_enctypes != NULL) {
78 free(parsed_enctypes);
79 parsed_enctypes = NULL;
80 parsed_num_enctypes = 0;
83 /* count the number of commas */
84 for (curr = enctypes; curr && *curr != '\0'; curr = ++comma) {
85 comma = strchr(curr, ',');
92 /* If no more commas and we're not at the end, there's one more value */
96 /* Empty string, return an error */
100 /* Allocate space for enctypes array */
101 if ((parsed_enctypes = (int *) calloc(n, sizeof(int))) == NULL) {
105 /* Now parse each value into the array */
106 for (curr = enctypes, i = 0; curr && *curr != '\0'; curr = ++comma) {
107 parsed_enctypes[i++] = atoi(curr);
108 comma = strchr(curr, ',');
113 parsed_num_enctypes = n;
114 if ((cached_enctypes = malloc(strlen(enctypes)+1)))
115 strcpy(cached_enctypes, enctypes);
121 get_kernel_supported_enctypes(void)
125 char buffer[MYBUFLEN + 1];
127 memset(buffer, '\0', sizeof(buffer));
129 s_e = fopen(supported_enctypes_filename, "r");
131 goto out_clean_parsed;
133 ret = fread(buffer, 1, MYBUFLEN, s_e);
136 goto out_clean_parsed;
139 if (parse_enctypes(buffer)) {
140 goto out_clean_parsed;
146 if (parsed_enctypes != NULL) {
147 free(parsed_enctypes);
148 parsed_num_enctypes = 0;
153 /*==========================*/
154 /*=== External routines ===*/
155 /*==========================*/
158 * Get encryption types supported by the kernel, and then
159 * call gss_krb5_set_allowable_enctypes() to limit the
160 * encryption types negotiated.
164 * -1 => there was an error
168 svcgssd_limit_krb5_enctypes(void)
170 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
171 u_int maj_stat, min_stat;
172 krb5_enctype default_enctypes[] = { ENCTYPE_DES_CBC_CRC,
174 ENCTYPE_DES_CBC_MD4 };
175 int default_num_enctypes =
176 sizeof(default_enctypes) / sizeof(default_enctypes[0]);
177 krb5_enctype *enctypes;
180 get_kernel_supported_enctypes();
182 if (parsed_enctypes != NULL) {
183 enctypes = parsed_enctypes;
184 num_enctypes = parsed_num_enctypes;
186 enctypes = default_enctypes;
187 num_enctypes = default_num_enctypes;
190 maj_stat = gss_set_allowable_enctypes(&min_stat, gssd_creds,
191 &krb5oid, num_enctypes, enctypes);
192 if (maj_stat != GSS_S_COMPLETE) {
193 printerr(1, "WARNING: gss_set_allowable_enctypes failed\n");
194 pgsserr("svcgssd_limit_krb5_enctypes: gss_set_allowable_enctypes",
195 maj_stat, min_stat, &krb5oid);