version 1.40, 2001/04/06 21:00:07 |
version 1.40.2.1, 2001/09/27 19:03:54 |
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int |
int |
auth_rsa(struct passwd *pw, BIGNUM *client_n) |
auth_rsa(struct passwd *pw, BIGNUM *client_n) |
{ |
{ |
char line[8192], file[MAXPATHLEN]; |
char line[8192], *file; |
int authenticated; |
int authenticated; |
u_int bits; |
u_int bits; |
FILE *f; |
FILE *f; |
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temporarily_use_uid(pw); |
temporarily_use_uid(pw); |
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/* The authorized keys. */ |
/* The authorized keys. */ |
snprintf(file, sizeof file, "%.500s/%.100s", pw->pw_dir, |
file = authorized_keys_file(pw); |
_PATH_SSH_USER_PERMITTED_KEYS); |
debug("trying public RSA key file %s", file); |
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/* Fail quietly if file does not exist */ |
/* Fail quietly if file does not exist */ |
if (stat(file, &st) < 0) { |
if (stat(file, &st) < 0) { |
/* Restore the privileged uid. */ |
/* Restore the privileged uid. */ |
restore_uid(); |
restore_uid(); |
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xfree(file); |
return 0; |
return 0; |
} |
} |
/* Open the file containing the authorized keys. */ |
/* Open the file containing the authorized keys. */ |
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restore_uid(); |
restore_uid(); |
packet_send_debug("Could not open %.900s for reading.", file); |
packet_send_debug("Could not open %.900s for reading.", file); |
packet_send_debug("If your home is on an NFS volume, it may need to be world-readable."); |
packet_send_debug("If your home is on an NFS volume, it may need to be world-readable."); |
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xfree(file); |
return 0; |
return 0; |
} |
} |
if (options.strict_modes) { |
if (options.strict_modes && |
int fail = 0; |
secure_filename(f, file, pw, line, sizeof(line)) != 0) { |
char buf[1024]; |
xfree(file); |
/* Check open file in order to avoid open/stat races */ |
fclose(f); |
if (fstat(fileno(f), &st) < 0 || |
log("Authentication refused: %s", line); |
(st.st_uid != 0 && st.st_uid != pw->pw_uid) || |
packet_send_debug("Authentication refused: %s", line); |
(st.st_mode & 022) != 0) { |
restore_uid(); |
snprintf(buf, sizeof buf, "RSA authentication refused for %.100s: " |
return 0; |
"bad ownership or modes for '%s'.", pw->pw_name, file); |
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fail = 1; |
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} else { |
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/* Check path to _PATH_SSH_USER_PERMITTED_KEYS */ |
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int i; |
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static const char *check[] = { |
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"", _PATH_SSH_USER_DIR, NULL |
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}; |
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for (i = 0; check[i]; i++) { |
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snprintf(line, sizeof line, "%.500s/%.100s", pw->pw_dir, check[i]); |
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if (stat(line, &st) < 0 || |
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(st.st_uid != 0 && st.st_uid != pw->pw_uid) || |
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(st.st_mode & 022) != 0) { |
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snprintf(buf, sizeof buf, "RSA authentication refused for %.100s: " |
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"bad ownership or modes for '%s'.", pw->pw_name, line); |
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fail = 1; |
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break; |
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} |
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} |
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} |
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if (fail) { |
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fclose(f); |
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log("%s", buf); |
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packet_send_debug("%s", buf); |
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restore_uid(); |
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return 0; |
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} |
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} |
} |
/* Flag indicating whether authentication has succeeded. */ |
/* Flag indicating whether authentication has succeeded. */ |
authenticated = 0; |
authenticated = 0; |
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/* Parse the key from the line. */ |
/* Parse the key from the line. */ |
if (!auth_rsa_read_key(&cp, &bits, pk->e, pk->n)) { |
if (!auth_rsa_read_key(&cp, &bits, pk->e, pk->n)) { |
debug("%.100s, line %lu: bad key syntax", |
debug("%.100s, line %lu: non ssh1 key syntax", |
file, linenum); |
file, linenum); |
packet_send_debug("%.100s, line %lu: bad key syntax", |
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file, linenum); |
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continue; |
continue; |
} |
} |
/* cp now points to the comment part. */ |
/* cp now points to the comment part. */ |
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/* check the real bits */ |
/* check the real bits */ |
if (bits != BN_num_bits(pk->n)) |
if (bits != BN_num_bits(pk->n)) |
log("Warning: %s, line %ld: keysize mismatch: " |
log("Warning: %s, line %lu: keysize mismatch: " |
"actual %d vs. announced %d.", |
"actual %d vs. announced %d.", |
file, linenum, BN_num_bits(pk->n), bits); |
file, linenum, BN_num_bits(pk->n), bits); |
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restore_uid(); |
restore_uid(); |
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/* Close the file. */ |
/* Close the file. */ |
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xfree(file); |
fclose(f); |
fclose(f); |
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RSA_free(pk); |
RSA_free(pk); |