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1 | #ifndef NO_GSSAPI |
2 | |
3 | #include <string.h> |
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4 | #include <gssapi/gssapi.h> |
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5 | #include "sshgss.h" |
6 | #include "misc.h" |
7 | |
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8 | static gss_OID_desc gss_mech_krb5_desc = |
9 | { 9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" }; |
10 | static gss_OID const gss_mech_krb5 = &gss_mech_krb5_desc; |
11 | |
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12 | typedef struct uxSsh_gss_ctx { |
13 | OM_uint32 maj_stat; |
14 | OM_uint32 min_stat; |
15 | gss_ctx_id_t ctx; |
16 | } uxSsh_gss_ctx; |
17 | |
18 | int ssh_gss_init(void) |
19 | { |
20 | /* On Windows this tries to load the SSPI library functions. On |
21 | Unix we assume we have GSSAPI at runtime if we were linked with |
22 | it at compile time */ |
23 | return 1; |
24 | } |
25 | |
26 | Ssh_gss_stat ssh_gss_indicate_mech(Ssh_gss_buf *mech) |
27 | { |
28 | /* Copy constant into mech */ |
29 | mech->len = gss_mech_krb5->length; |
30 | mech->data = gss_mech_krb5->elements; |
31 | |
32 | return SSH_GSS_OK; |
33 | } |
34 | |
35 | Ssh_gss_stat ssh_gss_import_name(char *host, |
36 | Ssh_gss_name *srv_name) |
37 | { |
38 | OM_uint32 min_stat,maj_stat; |
39 | gss_buffer_desc host_buf; |
40 | char *pStr; |
41 | |
42 | pStr = dupcat("host@", host, NULL); |
43 | |
44 | host_buf.value = pStr; |
45 | host_buf.length = strlen(pStr); |
46 | |
47 | maj_stat = gss_import_name(&min_stat, &host_buf, |
48 | GSS_C_NT_HOSTBASED_SERVICE, |
49 | (gss_name_t *)srv_name); |
50 | /* Release buffer */ |
51 | sfree(pStr); |
52 | if (maj_stat == GSS_S_COMPLETE) return SSH_GSS_OK; |
53 | return SSH_GSS_FAILURE; |
54 | } |
55 | |
56 | Ssh_gss_stat ssh_gss_acquire_cred(Ssh_gss_ctx *ctx) |
57 | { |
58 | uxSsh_gss_ctx *uxctx = snew(uxSsh_gss_ctx); |
59 | |
60 | uxctx->maj_stat = uxctx->min_stat = GSS_S_COMPLETE; |
61 | uxctx->ctx = GSS_C_NO_CONTEXT; |
62 | *ctx = (Ssh_gss_ctx) uxctx; |
63 | |
64 | return SSH_GSS_OK; |
65 | } |
66 | |
67 | Ssh_gss_stat ssh_gss_init_sec_context(Ssh_gss_ctx *ctx, |
68 | Ssh_gss_name srv_name, |
69 | int to_deleg, |
70 | Ssh_gss_buf *recv_tok, |
71 | Ssh_gss_buf *send_tok) |
72 | { |
73 | uxSsh_gss_ctx *uxctx = (uxSsh_gss_ctx*) *ctx; |
74 | OM_uint32 ret_flags; |
75 | |
76 | if (to_deleg) to_deleg = GSS_C_DELEG_FLAG; |
77 | uxctx->maj_stat = gss_init_sec_context(&uxctx->min_stat, |
78 | GSS_C_NO_CREDENTIAL, |
79 | &uxctx->ctx, |
80 | (gss_name_t) srv_name, |
81 | (gss_OID) gss_mech_krb5, |
82 | GSS_C_MUTUAL_FLAG | |
83 | GSS_C_INTEG_FLAG | to_deleg, |
84 | 0, |
85 | NULL, /* no channel bindings */ |
86 | (gss_buffer_desc *)recv_tok, |
87 | NULL, /* ignore mech type */ |
88 | (gss_buffer_desc *)send_tok, |
89 | &ret_flags, |
90 | NULL); /* ignore time_rec */ |
91 | |
92 | if (uxctx->maj_stat == GSS_S_COMPLETE) return SSH_GSS_S_COMPLETE; |
93 | if (uxctx->maj_stat == GSS_S_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED; |
94 | return SSH_GSS_FAILURE; |
95 | } |
96 | |
97 | Ssh_gss_stat ssh_gss_display_status(Ssh_gss_ctx ctx, Ssh_gss_buf *buf) |
98 | { |
99 | uxSsh_gss_ctx *uxctx = (uxSsh_gss_ctx *) ctx; |
100 | OM_uint32 lmin,lmax; |
101 | OM_uint32 ccc; |
102 | gss_buffer_desc msg_maj=GSS_C_EMPTY_BUFFER; |
103 | gss_buffer_desc msg_min=GSS_C_EMPTY_BUFFER; |
104 | |
105 | /* Return empty buffer in case of failure */ |
106 | SSH_GSS_CLEAR_BUF(buf); |
107 | |
108 | /* get first mesg from GSS */ |
109 | ccc=0; |
110 | lmax=gss_display_status(&lmin,uxctx->maj_stat,GSS_C_GSS_CODE,(gss_OID) gss_mech_krb5,&ccc,&msg_maj); |
111 | |
112 | if (lmax != GSS_S_COMPLETE) return SSH_GSS_FAILURE; |
113 | |
114 | /* get first mesg from Kerberos */ |
115 | ccc=0; |
116 | lmax=gss_display_status(&lmin,uxctx->min_stat,GSS_C_MECH_CODE,(gss_OID) gss_mech_krb5,&ccc,&msg_min); |
117 | |
118 | if (lmax != GSS_S_COMPLETE) { |
119 | gss_release_buffer(&lmin, &msg_maj); |
120 | return SSH_GSS_FAILURE; |
121 | } |
122 | |
123 | /* copy data into buffer */ |
124 | buf->len = msg_maj.length + msg_min.length + 1; |
125 | buf->data = snewn(buf->len + 1, char); |
126 | |
127 | /* copy mem */ |
128 | memcpy(buf->data, msg_maj.value, msg_maj.length); |
129 | buf->data[msg_maj.length] = ' '; |
130 | memcpy(buf->data + msg_maj.length + 1, msg_min.value, msg_min.length); |
131 | buf->data[buf->len] = 0; |
132 | /* free mem & exit */ |
133 | gss_release_buffer(&lmin, &msg_maj); |
134 | gss_release_buffer(&lmin, &msg_min); |
135 | return SSH_GSS_OK; |
136 | } |
137 | |
138 | Ssh_gss_stat ssh_gss_free_tok(Ssh_gss_buf *send_tok) |
139 | { |
140 | OM_uint32 min_stat,maj_stat; |
141 | maj_stat = gss_release_buffer(&min_stat, (gss_buffer_desc *)send_tok); |
142 | |
143 | if (maj_stat == GSS_S_COMPLETE) return SSH_GSS_OK; |
144 | return SSH_GSS_FAILURE; |
145 | } |
146 | |
147 | Ssh_gss_stat ssh_gss_release_cred(Ssh_gss_ctx *ctx) |
148 | { |
149 | uxSsh_gss_ctx *uxctx = (uxSsh_gss_ctx *) *ctx; |
150 | OM_uint32 min_stat; |
151 | OM_uint32 maj_stat=GSS_S_COMPLETE; |
152 | |
153 | if (uxctx == NULL) return SSH_GSS_FAILURE; |
154 | if (uxctx->ctx != GSS_C_NO_CONTEXT) |
155 | maj_stat = gss_delete_sec_context(&min_stat,&uxctx->ctx,GSS_C_NO_BUFFER); |
156 | sfree(uxctx); |
157 | |
158 | if (maj_stat == GSS_S_COMPLETE) return SSH_GSS_OK; |
159 | return SSH_GSS_FAILURE; |
160 | } |
161 | |
162 | |
163 | Ssh_gss_stat ssh_gss_release_name(Ssh_gss_name *srv_name) |
164 | { |
165 | OM_uint32 min_stat,maj_stat; |
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166 | maj_stat = gss_release_name(&min_stat, (gss_name_t *) srv_name); |
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167 | |
168 | if (maj_stat == GSS_S_COMPLETE) return SSH_GSS_OK; |
169 | return SSH_GSS_FAILURE; |
170 | } |
171 | |
172 | Ssh_gss_stat ssh_gss_get_mic(Ssh_gss_ctx ctx, Ssh_gss_buf *buf, |
173 | Ssh_gss_buf *hash) |
174 | { |
175 | uxSsh_gss_ctx *uxctx = (uxSsh_gss_ctx *) ctx; |
176 | if (uxctx == NULL) return SSH_GSS_FAILURE; |
177 | return gss_get_mic(&(uxctx->min_stat), |
178 | uxctx->ctx, |
179 | 0, |
180 | (gss_buffer_desc *)buf, |
181 | (gss_buffer_desc *)hash); |
182 | } |
183 | |
184 | Ssh_gss_stat ssh_gss_free_mic(Ssh_gss_buf *hash) |
185 | { |
186 | /* On Unix this is the same freeing process as ssh_gss_free_tok. */ |
187 | return ssh_gss_free_tok(hash); |
188 | } |
189 | |
190 | #else |
191 | |
192 | /* Dummy function so this source file defines something if NO_GSSAPI |
193 | is defined. */ |
194 | |
195 | int ssh_gss_init(void) |
196 | { |
197 | return 1; |
198 | } |
199 | |
200 | #endif |