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1 | /* |
2 | * SSH agent client code. |
3 | */ |
4 | |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
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7 | #include <assert.h> |
8 | #include <unistd.h> |
9 | #include <sys/socket.h> |
10 | #include <sys/un.h> |
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11 | #include <fcntl.h> |
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12 | |
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13 | #include "putty.h" |
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14 | #include "misc.h" |
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15 | #include "tree234.h" |
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16 | #include "puttymem.h" |
17 | |
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18 | int agent_exists(void) |
19 | { |
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20 | if (getenv("SSH_AUTH_SOCK") != NULL) |
21 | return TRUE; |
22 | return FALSE; |
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23 | } |
24 | |
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25 | static tree234 *agent_connections; |
26 | struct agent_connection { |
27 | int fd; |
28 | char *retbuf; |
29 | char sizebuf[4]; |
30 | int retsize, retlen; |
31 | void (*callback)(void *, void *, int); |
32 | void *callback_ctx; |
33 | }; |
34 | static int agent_conncmp(void *av, void *bv) |
35 | { |
36 | struct agent_connection *a = (struct agent_connection *) av; |
37 | struct agent_connection *b = (struct agent_connection *) bv; |
38 | if (a->fd < b->fd) |
39 | return -1; |
40 | if (a->fd > b->fd) |
41 | return +1; |
42 | return 0; |
43 | } |
44 | static int agent_connfind(void *av, void *bv) |
45 | { |
46 | int afd = *(int *) av; |
47 | struct agent_connection *b = (struct agent_connection *) bv; |
48 | if (afd < b->fd) |
49 | return -1; |
50 | if (afd > b->fd) |
51 | return +1; |
52 | return 0; |
53 | } |
54 | |
55 | static int agent_select_result(int fd, int event) |
56 | { |
57 | int ret; |
58 | struct agent_connection *conn; |
59 | |
60 | assert(event == 1); /* not selecting for anything but R */ |
61 | |
62 | conn = find234(agent_connections, &fd, agent_connfind); |
63 | if (!conn) { |
64 | uxsel_del(fd); |
65 | return 1; |
66 | } |
67 | |
68 | ret = read(fd, conn->retbuf+conn->retlen, conn->retsize-conn->retlen); |
69 | if (ret <= 0) { |
70 | if (conn->retbuf != conn->sizebuf) sfree(conn->retbuf); |
71 | conn->retbuf = NULL; |
72 | conn->retlen = 0; |
73 | goto done; |
74 | } |
75 | conn->retlen += ret; |
76 | if (conn->retsize == 4 && conn->retlen == 4) { |
77 | conn->retsize = GET_32BIT(conn->retbuf); |
78 | if (conn->retsize <= 0) { |
79 | conn->retbuf = NULL; |
80 | conn->retlen = 0; |
81 | goto done; |
82 | } |
83 | conn->retsize += 4; |
84 | assert(conn->retbuf == conn->sizebuf); |
85 | conn->retbuf = snewn(conn->retsize, char); |
86 | memcpy(conn->retbuf, conn->sizebuf, 4); |
87 | } |
88 | |
89 | if (conn->retlen < conn->retsize) |
90 | return 0; /* more data to come */ |
91 | |
92 | done: |
93 | /* |
94 | * We have now completed the agent query. Do the callback, and |
95 | * clean up. (Of course we don't free retbuf, since ownership |
96 | * of that passes to the callback.) |
97 | */ |
98 | conn->callback(conn->callback_ctx, conn->retbuf, conn->retlen); |
99 | uxsel_del(fd); |
100 | close(fd); |
101 | del234(agent_connections, conn); |
102 | sfree(conn); |
103 | return 0; |
104 | } |
105 | |
106 | int agent_query(void *in, int inlen, void **out, int *outlen, |
107 | void (*callback)(void *, void *, int), void *callback_ctx) |
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108 | { |
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109 | char *name; |
110 | int sock; |
111 | struct sockaddr_un addr; |
112 | int done; |
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113 | struct agent_connection *conn; |
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114 | |
115 | name = getenv("SSH_AUTH_SOCK"); |
116 | if (!name) |
117 | goto failure; |
118 | |
119 | sock = socket(PF_UNIX, SOCK_STREAM, 0); |
120 | if (sock < 0) { |
121 | perror("socket(PF_UNIX)"); |
122 | exit(1); |
123 | } |
124 | |
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125 | cloexec(sock); |
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126 | |
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127 | addr.sun_family = AF_UNIX; |
128 | strncpy(addr.sun_path, name, sizeof(addr.sun_path)); |
129 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { |
130 | close(sock); |
131 | goto failure; |
132 | } |
133 | |
134 | for (done = 0; done < inlen ;) { |
135 | int ret = write(sock, (char *)in + done, inlen - done); |
136 | if (ret <= 0) { |
137 | close(sock); |
138 | goto failure; |
139 | } |
140 | done += ret; |
141 | } |
142 | |
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143 | if (!agent_connections) |
144 | agent_connections = newtree234(agent_conncmp); |
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145 | |
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146 | conn = snew(struct agent_connection); |
147 | conn->fd = sock; |
148 | conn->retbuf = conn->sizebuf; |
149 | conn->retsize = 4; |
150 | conn->retlen = 0; |
151 | conn->callback = callback; |
152 | conn->callback_ctx = callback_ctx; |
153 | add234(agent_connections, conn); |
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154 | |
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155 | uxsel_set(sock, 1, agent_select_result); |
156 | return 0; |
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157 | |
158 | failure: |
159 | *out = NULL; |
160 | *outlen = 0; |
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161 | return 1; |
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162 | } |