1CURLOPT_PROXY_ISSUERCERT_BLOcBu(r3l)_easy_setopt optCiUoRnLsOPT_PROXY_ISSUERCERT_BLOB(3)
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6 CURLOPT_PROXY_ISSUERCERT_BLOB - proxy issuer SSL certificate from mem‐
7 ory blob
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10 #include <curl/curl.h>
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12 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_ISSUERCERT_BLOB,
13 struct curl_blob *blob);
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16 Pass a pointer to a curl_blob struct, which contains information
17 (pointer and size) about a memory block with binary data of a CA cer‐
18 tificate in PEM format. If the option is set, an additional check
19 against the peer certificate is performed to verify the issuer of the
20 the HTTPS proxy is indeed the one associated with the certificate pro‐
21 vided by the option. This additional check is useful in multi-level PKI
22 where one needs to enforce that the peer certificate is from a specific
23 branch of the tree.
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25 This option should be used in combination with the CUR‐
26 LOPT_PROXY_SSL_VERIFYPEER(3) option. Otherwise, the result of the check
27 is not considered as failure.
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29 A specific error code (CURLE_SSL_ISSUER_ERROR) is defined with the op‐
30 tion, which is returned if the setup of the SSL/TLS session has failed
31 due to a mismatch with the issuer of peer certificate (CUR‐
32 LOPT_PROXY_SSL_VERIFYPEER(3) has to be set too for the check to fail).
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34 If the blob is initialized with the flags member of struct curl_blob
35 set to CURL_BLOB_COPY, the application does not have to keep the buffer
36 around after setting this.
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38 This option is an alternative to CURLOPT_PROXY_ISSUERCERT(3) which in‐
39 stead expects a file name as input.
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42 NULL
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45 All TLS-based protocols
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48 CURL *curl = curl_easy_init();
49 if(curl) {
50 struct curl_blob blob;
51 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
52 /* using an HTTPS proxy */
53 curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443");
54 blob.data = certificateData;
55 blob.len = filesize;
56 blob.flags = CURL_BLOB_COPY;
57 curl_easy_setopt(curl, CURLOPT_PROXY_ISSUERCERT_BLOB, &blob);
58 ret = curl_easy_perform(curl);
59 curl_easy_cleanup(curl);
60 }
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63 Added in 7.71.0. This option is supported by the OpenSSL backends.
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66 Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
67 not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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70 CURLOPT_PROXY_SSL_VERIFYPEER(3), CURLOPT_PROXY_SSL_VERIFYHOST(3), CUR‐
71 LOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),
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75libcurl 7.85.0 May 17, 2022 CURLOPT_PROXY_ISSUERCERT_BLOB(3)